687 results on '"Static test"'
Search Results
2. Experimental and numerical studies on steel liner tray walls under static transverse loads
- Author
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Dinu, Florea, Neagu, Calin, Dubina, Dan, Senila, Mihai, Laszlo, Robert, and Ghicioi, Emilian
- Published
- 2024
- Full Text
- View/download PDF
3. Comparison of static tests and dynamic tests for coal dust surfactants evaluation: A review
- Author
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Zhao, Zidong, Chang, Ping, Xu, Guang, Xie, Quan, and Ghosh, Apurna
- Published
- 2022
- Full Text
- View/download PDF
4. Experimental study on shear bearing capacity of Ultra‐high performance concrete bent cap with thin‐walled hollow section.
- Author
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Lv, Wenshu, Jia, Junfeng, Yao, Xiaofei, Zhang, Kaidi, Gu, Ranxing, and Lai, Menggang
- Subjects
- *
FINITE element method , *CRACK propagation (Fracture mechanics) , *FAILURE mode & effects analysis , *IRON & steel bridges , *MODELS & modelmaking , *ARCHES - Abstract
Compared with precast bent caps, high‐performance precast bent caps are shorter and lighter, a well‐designed precast bent cap can improve the construction rate, and guarantee an acceptable shear resistance capacity. Therefore, an ultra‐high‐performance concrete (UHPC) with a thin‐walled hollow bent cap suitable for short and medium spans was designed, and its mechanical performance was studied. Firstly, a UHPC bent cap model with a scale ratio of 1:3 was cast and used in a 4‐point loading test, and its crack propagation pattern, shear resistance capacity, and failure mode of the bent cap were revealed. Then, based on an ABAQUS finite element model verified by the experimental results, the influence of various design parameters on the shear performance of the UHPC bent cap was fully investigated, including longitudinal reinforcement ratio, stirrup ratio, web width, bottom thickness, and the thickness of the top and bottom plates. Finally, a prediction formula of shear bearing capacity suitable for different cross‐section types was developed based on the truss‐arch model. The results indicated that the bridging effect of steel fibers and diaphragm cloud restrained the generation and extension of cracks during the loading process, thus the UHPC bent cap showed good deformability and shear‐resistant capacity. Besides, the shear resistance capacity was improved by the increasing longitudinal reinforcement ratio, stirrup ratio, web width, and the thickness of the top and bottom plates. The accuracy and generalization ability of the established formula was validated by comparing the predicted results with the experimental results derived from this paper and relevant studies. The research can facilitate the application of UHPC and structure lightweight technology in bridge engineering. [ABSTRACT FROM AUTHOR]
- Published
- 2025
- Full Text
- View/download PDF
5. Collapse Behavior of Unequal-Span Multistory Composite Frames under the Scenario of Removing an Internal Column.
- Author
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Tan, Zheng, Zhong, Wei-hui, Gao, Yao, Meng, Bao, Duan, Shi-chao, and Zheng, Yu-hui
- Subjects
- *
STRUCTURAL frames , *FAILURE mode & effects analysis , *COLUMNS , *PROGRESSIVE collapse , *COMPUTER simulation , *AESTHETICS - Abstract
To satisfy the requirements of architectural aesthetic and function demands, unequal-span composite frames are widely employed in practical engineering applications. However, there has been relatively limited investigation on the collapse-resistant performance of such frame structures. To elucidate the collapse behavior of the unequal-span multistory frame structures under the scenario of removing an internal column, two one-third scaled three-story planar frames with unequal (2/3:1) and equal (1:1) spans were subjected to static testing, and the anticollapse performance including the load-bearing capacities, failure modes, development of axial force, and load-transferring mechanisms was determined. The test results revealed that the unequal-span specimens reached their maximum load during the early stage of small deformation, whereas the equal-span specimens achieved their maximum load at the final failure position owing to the collaborate action of equal-span double-span beams. Subsequently, numerical modeling methods were validated using the tests results, and the influence of the axial compression ratios of adjacent columns on the structural collapse resistance was examined. Furthermore, the collapse behavior of unequal-span composite frames was further investigated using full-scale models, with a focus on three types unequal-span cases for double-span beams, and specific resistant contribution coefficients were proposed as an crucial design reference for unequal-span composite frames to mitigate progressive collapse. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
6. Experiment and numerical analysis of prestressed unequal-walled rectangular concrete-filled steel box beams
- Author
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Qi Su, Guangyuan Fu, Jian Yang, and Siping Li
- Subjects
Prestressed ,Partially filled ,Steel box-concrete ,Static test ,Bending performance ,Medicine ,Science - Abstract
Abstract When long-span beams undergo large, the strength of the beam material cannot be fully utilized. To solve this problem, a prestressed unequal-walled rectangular concrete-filled steel box (PURCFSB) beam is proposed in this paper. The prestressing is added to the concrete-filled steel tubular (CFST) beam and the section is designed. This beam is an improved concrete-filled steel tubular (CFST) beam with flanges of unequal thickness; the upper part of the steel box contains concrete, and the lower part is fitted with prestressed steel bars. Bending tests on ten PURCFSB beams with different concrete filling ratios and prestress levels revealed that prestressing can increase the yield bending moment and delay the cracking of concrete. The appropriate filling ratio can improve the structure’s yield moment and ultimate bearing capacity and reduce its self-weight while avoiding concrete cracking within the scope of work. Finite element analysis of the whole bending process of PURCFSB beams, carried out using ABAQUS software, yields results that are in good agreement with the experimental results. Parametric analysis (based on the validated finite element model) of the effects of the filling ratio and prestress level on the bending performance revealed that PURCFSB beams have good bearing capacity and deformation performance.
- Published
- 2025
- Full Text
- View/download PDF
7. Experimental study on the flexural performance of concrete hollow composite slabs with tightly connected panel sides
- Author
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Xudong Chen and Qinyong Ma
- Subjects
Hollow composite slab ,Tightly connected ,Steel truss ,Static test ,Flexural performance ,Medicine ,Science - Abstract
Abstract The performance of joint connections in composite slabs is crucial for ensuring their bidirectional load-bearing capacity and overall structural integrity. To effectively address the challenge of protruding rebar in precast components, a new structural form of a tightly connected hollow concrete composite slab without protruding rebar on the slab side is proposed. To investigate the mechanical performance and failure modes of this slab-side tight-joint connected hollow concrete composite slab, bending performance tests under monotonic load were conducted on three tightly connected hollow composite slabs and one seamless hollow composite slab. The analysis focused on the failure modes, crack distribution, bending capacity, and bending stiffness of additional steel bars at the joints of the slabs. The results indicate that, under normal operating conditions, the flexural performance development of concrete hollow composite slabs with tightly connected slab sides is generally consistent with that of the non-spliced cast hollow composite slab. Under ultimate conditions, tearing or brittle fracture failure at the joint interface is likely to occur in the composite slabs, leading to a reduction in flexural bearing capacity. With an increase in joints, the bending capacity of the hollow composite slab decreases by 17.1%, Conversely, when joints are positioned away from the most stressed section, the flexural stiffness of the section increases by 13.5%. A comparison of experimental data and theoretical calculations indicates that the additional rebar at the joints effectively contributes to the lateral load transfer in the hollow composite slab, achieving bidirectional load-bearing capacity. This further validates that the design of the single-joint, tight-joint connected hollow concrete composite slab without protruding rebar meets the requirements for bidirectional load-bearing performance.
- Published
- 2024
- Full Text
- View/download PDF
8. Flammability and Mechanical Testing of Sandwich Composite for Rolling Stock Structural Applications.
- Author
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Kalinowski, Marcin, Szczepanik, Mirosław, and Szymiczek, Małgorzata
- Subjects
- *
SANDWICH construction (Materials) , *FATIGUE limit , *FIRE testing , *MANUFACTURING processes , *FINITE element method - Abstract
Components made of composite materials are being increasingly used in the construction of rolling stock. Currently, the use of components made of composite materials as train structural elements is increasingly being considered. Non-structural components made of composites are most often found inside rail vehicles (e.g., the interior lining), while structural components made of sandwich composite materials can be used for the roof, sidewalls, and underframe constructions. This article provides a description of an innovative sandwich composite developed for a metro's underframe, as well as the production process and preparation of the composite specimens. The main parts of the work are flammability and mechanical (static and fatigue) tests of the innovative sandwich composite. The scope of the flammability tests included the testing of the fire properties using the radial plate method, the optical density of smoke, and the content of toxic gases. The mechanical strength of the sandwich composite was examined during a flexural (three-point bending) test and a fatigue strength under a given dynamic load. The results presented in the article are very significant, both in terms of flammability and the mechanical strength tests. In order to produce large-size train components, appropriately large patches of component layers of the composite are required; this may pose production problems. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
9. 静力模型优化分析简支 T 梁桥横向分布系数与刚度.
- Author
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董春彦, 陈顺超, 彭文柏, 江强, 郑维龙, and 阳青成
- Abstract
In view of the high cost of bridge load test and the high professional requirements for test personnel, in order to provide more realistic theoretical data for bridge monitoring, a method of correcting theoretical parameters based on structural static test results was proposed. This method can consider the shear deformation between T-beams, and is more suitable for the actual connection between beams than the hinged T-beam method, which greatly improves the analysis accuracy and reduces the professional requirements for the test personnel. The proposed method was applied to the transverse distribution coefficient and stiffness analysis of plexiglass hinged T-beam bridge model. The results show that without considering the influence of shear force between beams, the calculation results of the influence line of load transverse distribution are consistent with those of the hinged T-beam method under the analysis and calculation of the simplified analysis model, which ensures the accuracy of the simplified model and analysis results. The load transverse distribution coefficient obtained by the proposed method is better than that of the hinged T-beam method, and it can more accurately reflect the actual stiffness of the bridge. Based on the static measured response value of the plexiglass model, the key control parameters of the simplified analysis model are identified. Based on the measured data, the modified theoretical model and the lateral distribution coefficient calculated by the software extraction value, the difference is small. It is proved that the method can better reflect the actual stiffness of the bridge and provide more realistic theoretical data for monitoring. It can be seen that the static model optimization analysis of the simply supported T-beam bridge, the optimization rate of the deflection of the beam under the most unfavorable load is 27. 71%. Under the three working conditions, the numerical optimization rate of the influence line of the beam with the largest deflection is 34. 82%, 13. 07% and 5. 46%, respectively. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
10. Application of Modular Design Methodology for Endodontic Instrument Fatigue Test Bench.
- Author
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Segura-Trujillo, C. R., Orozco-Ocampo, Y. M., and Álvarez-Vargas, C. A.
- Subjects
- *
FATIGUE limit , *FATIGUE testing machines , *MODULAR design , *ALLOY testing , *STRESS fractures (Orthopedics) - Abstract
In endodontic procedures, nickel-titanium (NiTi) instruments, which conform to the geometry of root canals, are employed to enhance the mechanical properties of files. However, the high cost of these instruments necessitates repeated use, increasing the risk of fatigue fractures during treatment. With various brands and types of endodontic instruments available in the market, characterizing the mechanical properties of files and their behavior under fatigue loads is essential. Currently, no standardized tests exist for assessing fatigue resistance, and each research study adopts its own equipment and methodology. This project aims to develop a test bench for fatigue testing of endodontic instruments without restrictions on material, crosssection, or external design, enabling both static and dynamic tests. The test bench employs a modular design strategy to identify components suited for modularization, utilizing readily available elements and manufacturing techniques such as 3D printing. The device operates on two axes, X and Y, and allows regulation of the instrument's depth of entry into the channel. Furthermore, it features an electronic system for automating dynamic and static tests, an LCD screen for menu navigation, and the ability to record the number of cycles until file fracture. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
11. Punching Shear Performance of Reinforced Concrete Slab-Column Joints with Shearhead Reinforcement.
- Author
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Jiang, Yi, Li, Yan, Zhou, Jing, and Yi, Weiwen
- Subjects
DEAD loads (Mechanics) ,FAILURE mode & effects analysis ,REINFORCED concrete ,NUMERICAL analysis ,FLANGES ,CONCRETE slabs ,CONCRETE joints - Abstract
The punching shear performance of reinforced concrete (RC) slab–column joints with shearhead reinforcement was investigated to optimize shearhead reinforcement design. Nine slab–column joint specimens were designed with different flange thicknesses, web thicknesses, cantilever lengths, and anchor stud sizes. The specimens were subjected to reversed static loading tests to investigate their failure history and failure modes; measure the load capacity, deformation, and strain of the joints; investigate the influence of different design combinations on the punching shear failure mode and load capacity of the joints; and elucidate their failure mechanisms. Test simulation analysis and numerical parametric analysis were conducted based on the test results. The results showed that the shearhead enhanced the punching shear performance of the slab–column joint and improved the brittleness of the punching shear failure. Installing steel section flanges and anchor studs enhanced the synergy among the longitudinal reinforcement, steel section, and concrete in the joint, and increasing the web thickness and installing flanges both improved the punching shear capacity and ductility of the joint. The installation of flanges on the web of the steel section increased the ultimate load capacity by more than 40% and increased the mid-span displacement at failure by more than twice that of the specimen without flanges and the specimen with studs. Adding anchor studs to the web of the steel section increased the ultimate punching shear capacity of the RC slab–column joint by 25%. Using anchor bolts instead of flanges improved the punching shear capacity of the joint but was not as effective in improving ductility. Increasing the flange thickness to increase the load capacity had a marginal effect; the ultimate load capacity increased by only 7% when the web area increased by 2/3, and the shearhead did not enhance punching shear capacity if the cantilever of the steel section was too short. Finally, based on the existing code, test results and numerical parametric analysis results, a method for calculating the punching shear capacity of RC slab–column joints with shearhead reinforcement was proposed. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
12. 型钢剪力架增强混凝土板柱节点抗冲切试验研究.
- Author
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林若凯, 江 毅, 李 妍, and 易伟文
- Abstract
Copyright of Engineering Mechanics / Gongcheng Lixue is the property of Engineering Mechanics Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2024
- Full Text
- View/download PDF
13. Experimental study on the flexural performance of concrete hollow composite slabs with tightly connected panel sides.
- Author
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Chen, Xudong and Ma, Qinyong
- Subjects
CONSTRUCTION slabs ,CONCRETE slabs ,LATERAL loads ,BRITTLE fractures ,FAILURE mode & effects analysis ,CONCRETE ,STEEL bars - Abstract
The performance of joint connections in composite slabs is crucial for ensuring their bidirectional load-bearing capacity and overall structural integrity. To effectively address the challenge of protruding rebar in precast components, a new structural form of a tightly connected hollow concrete composite slab without protruding rebar on the slab side is proposed. To investigate the mechanical performance and failure modes of this slab-side tight-joint connected hollow concrete composite slab, bending performance tests under monotonic load were conducted on three tightly connected hollow composite slabs and one seamless hollow composite slab. The analysis focused on the failure modes, crack distribution, bending capacity, and bending stiffness of additional steel bars at the joints of the slabs. The results indicate that, under normal operating conditions, the flexural performance development of concrete hollow composite slabs with tightly connected slab sides is generally consistent with that of the non-spliced cast hollow composite slab. Under ultimate conditions, tearing or brittle fracture failure at the joint interface is likely to occur in the composite slabs, leading to a reduction in flexural bearing capacity. With an increase in joints, the bending capacity of the hollow composite slab decreases by 17.1%, Conversely, when joints are positioned away from the most stressed section, the flexural stiffness of the section increases by 13.5%. A comparison of experimental data and theoretical calculations indicates that the additional rebar at the joints effectively contributes to the lateral load transfer in the hollow composite slab, achieving bidirectional load-bearing capacity. This further validates that the design of the single-joint, tight-joint connected hollow concrete composite slab without protruding rebar meets the requirements for bidirectional load-bearing performance. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
14. 飞机结构静强度试验屈曲检测系统设计实现.
- Author
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许向彦, 常亮, 韩志华, and 聂小华
- Abstract
The real-time judgment and screening of the dangerous parts of the whole structure is always one of the very difficult problems in the process of structural strength verification. As an important monitoring index in the static test of aircraft structure, the identification and judgment of the buckling position determines the degree of control of the field test personnel on the overall test. In the static strength test of aircraft structure, the test risk is more and more difficult to control, and unexpected structural failure occurs from time to time. In order to realize the identification of structural buckling parts accurately and efficiently, a buckling real-time detection system was designed and realized. The system realized real-time acquisition of collected data based on timer technology, and completes buckling position judgment based on nonlinearity, and finally visualized the buckling parts through two-dimensional and three-dimensional forms. The system has been applied in the test site, and the effect is remarkable. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
15. Statik Testlerin Çimentolu Macun Dolguda Asit Maden Drenajı (AMD) Özelliklerinin Belirlenmesinde Kullanımı.
- Author
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QKOÇ, Ercüment, CİHANGİR, Ferdi, and ERÇIDKI, Bayram
- Abstract
Copyright of Afyon Kocatepe University Journal of Science & Engineering / Afyon Kocatepe Üniversitesi Fen Ve Mühendislik Bilimleri Dergisi is the property of Afyon Kocatepe University, Faculty of Science & Literature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2024
- Full Text
- View/download PDF
16. 高强型钢超高性能混凝土短柱轴压性能 试验及其有限元分析.
- Author
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刘祖强, 周志明, 薛建阳, and 毛冬旭
- Abstract
Copyright of Engineering Mechanics / Gongcheng Lixue is the property of Engineering Mechanics Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2024
- Full Text
- View/download PDF
17. Investigation of Acid Mine Drainage Generation Potential of Altered Volcanic Units
- Author
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Demir, Uğur, Canıeren, Ömer, and Karagüzel, Cengiz
- Published
- 2025
- Full Text
- View/download PDF
18. Approach towards net-zero carbon emission: rice husk ash cementitious material on the fibrous reinforced concrete beams under mechanical loading through the experiment and simulations
- Author
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Khanna, Manish and Senthil, K.
- Published
- 2025
- Full Text
- View/download PDF
19. Tapered piles responses during large-scale axial static and high-strain dynamic load testing
- Author
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Ibsen, Lars Bo and Barari, Amin
- Published
- 2025
- Full Text
- View/download PDF
20. 预制模壳填芯混凝土悬臂盖梁承载力分析.
- Author
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贾俊峰, 张福香, 张 瑞, and 张建勋
- Abstract
Copyright of Journal of Henan University of Science & Technology, Natural Science is the property of Editorial Office of Journal of Henan University of Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2024
- Full Text
- View/download PDF
21. UHPC 预制拼装综合管廊的抗弯性能试验.
- Author
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许有胜, 杨纪豪, 夏樟华, and 孙康平
- Abstract
Copyright of Journal of Fuzhou University is the property of Journal of Fuzhou University, Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2024
- Full Text
- View/download PDF
22. Technology of Static Test for Slat on Large-Aspect-Ration Wing
- Author
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Bing, Liu, Jianfeng, Zhang, Mengmeng, Wang, fei, Luo, Luanliang, Zhou, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Hirche, Sandra, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Li, Yong, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Oneto, Luca, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zamboni, Walter, Series Editor, Tan, Kay Chen, Series Editor, and Fu, Song, editor
- Published
- 2024
- Full Text
- View/download PDF
23. Static Engine Test on CTN Model Rocket Engine with 1/2 A6-2 Propellant
- Author
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Raj, Sarath, Elsonbaty, Nour Alaa, Ramamoorthy, Sathiyagayathiri, Chaari, Fakher, Series Editor, Gherardini, Francesco, Series Editor, Ivanov, Vitalii, Series Editor, Haddar, Mohamed, Series Editor, Cavas-Martínez, Francisco, Editorial Board Member, di Mare, Francesca, Editorial Board Member, Kwon, Young W., Editorial Board Member, Trojanowska, Justyna, Editorial Board Member, Xu, Jinyang, Editorial Board Member, Tyagi, R. K., editor, Gupta, Pallav, editor, Das, Prosenjit, editor, and Prakash, Rajiv, editor
- Published
- 2024
- Full Text
- View/download PDF
24. Enhanced structural health monitoring of ageing Pratt truss bridges: a combined approach of static and dynamic measurements
- Author
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Azhar, Anis Shafiqah, Abdul Kudus, Sakhiah, Jamadin, Adiza, and Leman, Shaiful Amir
- Published
- 2024
- Full Text
- View/download PDF
25. Static test of T800 carbon fiber reinforced polymer (CFRP) wing-box.
- Author
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Chao Chen and Botao Hu
- Subjects
- *
CARBON fiber testing , *AIRFRAMES , *TEST methods , *POLYMERS , *STRUCTURAL design , *AIRPLANE wings - Abstract
This paper studies static test methods and test loads of Carbon Fiber Reinforced Polymer (CFRP) wing-box, analyzes the test results, and compares the test results of T800 CFRP wing-box from HENGSHEN Co., LTD and TORAY. It comes out that the stiffness of the T800 CFRP wing-box from HENGSHEN is equivalent with that of TORAY, while the strength meets the structural design requirements, which can be applied on the scheduled aircraft structure for further verification. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
26. A Resilient Approach to a Test Rig Setup in the Qualification of a Tilt Rotor Carbon Fiber-Reinforced Polymer (CFRP) Wing.
- Author
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Vitale, Pasquale, Diodati, Gianluca, Orlando, Salvatore, Timbrato, Francesco, Miano, Mario, Chiariello, Antonio, and Belardo, Marika
- Subjects
CARBON fiber-reinforced plastics ,AIRPLANE wings ,SHEARING force ,AERONAUTICAL safety measures ,BENDING moment ,FAILURE mode & effects analysis ,ENGINEERING design ,FAILURE analysis - Abstract
The evolution of aircraft wing development has seen significant progress since the early days of aviation, with static testing emerging as a crucial aspect for ensuring safety and reliability. This study focused specifically on the engineering phase of static testing for the Clean Sky 2 T-WING project, which is dedicated to testing the innovative composite wing of the Next-Generation Civil Tiltrotor Technology Demonstrator. During the design phase, critical load cases were identified through shear force/bending moment (SFBM) and failure mode analyses. To qualify the wing, an engineering team designed a dedicated test rig equipped with hydraulic jacks to mirror the SFBM diagrams. Adhering to specifications and geometric constraints due to several factors, the jacks aimed to minimize the errors (within 5%) in replicating the diagrams. An effective algorithm, spanning five phases, was employed to pinpoint the optimal configuration. This involved analyzing significant components, conducting least square linear optimizations, selecting solutions that met the directional constraints, analyzing the Pareto front solutions, and evaluating the external jack forces. The outcome was a test rig setup with a viable set of hydraulic jack forces, achieving precise SFBM replication on the wing with minimal jacks and overall applied forces. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
27. 预制UHPC-RAC组合梁受弯性能试验与理论计算.
- Author
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秦朝刚, 吴涛, 刘伯权, 王博, and 李寓
- Abstract
Copyright of Acta Materiae Compositae Sinica is the property of Acta Materiea Compositae Sinica Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2024
- Full Text
- View/download PDF
28. Static and Seismic Experimental Study of Novel Prefabricated Beam-Column Joints with Elongated-Hole Brackets.
- Author
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Zhang, Zhiwei, Li, Dong, Wang, Huajie, Li, Songling, Qian, Hongliang, Bi, Yanhua, Wang, Guoxing, Jin, Xiaofei, and Fan, Feng
- Abstract
To enhance the structural connectivity of prefabricated steel frame systems and augment their construction efficiency, this study introduces an innovative prefabricated joint design tailored for square steel columns and H-beams characterized by varying beam heights. This study includes both static loading tests and seismic tests performed on full-scale joints featuring two different beam heights. This investigation involved a comprehensive analysis of the static and seismic performance of the joints, employing various performance metrics such as ultimate load capacities, ultimate rotation angles, hysteresis curves, skeleton curves, stiffness degradation curves, and ductility coefficients, in alignment with established structural codes and standards. The results indicate that the plasticity of the H-beam is fully developed, exhibiting a relative slip phenomenon. Additionally, the joints demonstrate commendable rotational capacity, with hysteresis curves consistently manifesting an inverse S-shape and exhibiting noteworthy stiffness degradation. Furthermore, the comparison with the unimproved joint shows that the novel joint, in addition to being easy to construct, has better ductility and energy dissipation capacity. The results of the study will provide a technical reference for further optimization and application of prefabricated beam-column joints. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
29. Environmental compliance assessment for the desulfurization of sulfide mine waste tailings: A case study of Ok Tedi Mine, Papua New Guinea
- Author
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Wesley Kiwingim, Aine Gormley, Richard Douglas, and Joerg Arnscheidt
- Subjects
Sulfide mine waste tailings ,Acid rock drainage ,Tailings desulfurization ,Environmental compliance assessment ,Static test ,Environmental sciences ,GE1-350 - Abstract
The effective management of sulfide mine waste tailings is a complex task because of the potential for acid rock drainage to harm aquatic ecosystems. Although previous research has explored the environmental consequences of sulfide mine waste tailings and the potential advantages of desulfurization method, there is a lack of studies examining the environmental compliance of desulfurization efforts. To bridge this knowledge gap, a study was conducted at the Ok Ted Mine to evaluate the environmental compliance of the implemented desulfurization process. Ninety samples of sulfide tailing, desulfurized tailing, and sulfide concentrate were collected and analyzed for geochemical and physical properties. The acid-generating capacities were assessed using the Sobek's static test, whereas the particle size, pH, and recovery were evaluated for the overall performance of the desulfurization process. These findings indicated that the desulfurization process significantly reduced the acid-generating capacity and heavy metal concentrations of the sulfide tailings below the regulatory threshold levels. Therefore, the desulfurization approach employed at the Ok Ted Mine comply with the environmental regulaotry requirments. For further assessment, a study is recommended to evaluate the impact of desulfurization on the ecosystem to predict full extent of biodiversity recovery after mine life.
- Published
- 2024
- Full Text
- View/download PDF
30. 梁板融合预制装配式双拼槽钢-混组合楼板试验.
- Author
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石敬州, 周凌宇, 方蛟鹏, 刘晓春, 刘家豪, 何昌杰, 李分规, 戴超虎, 廖 飞, and 吴睿智
- Subjects
EQUILIBRIUM - Abstract
Copyright of Journal of Harbin Institute of Technology. Social Sciences Edition / Haerbin Gongye Daxue Xuebao. Shehui Kexue Ban is the property of Harbin Institute of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2024
- Full Text
- View/download PDF
31. 不同螺栓等级下共享铁塔挂载连接件承载性能研究.
- Author
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钟炜辉, 赵孟军, 郑玉辉, 房正刚, and 蒋 成
- Subjects
NUMERICAL analysis - Abstract
Copyright of Journal of Architecture & Civil Engineering is the property of Chang'an Daxue Zazhishe and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2024
- Full Text
- View/download PDF
32. The Removal of Selected Pharmaceuticals from Water by Adsorption with Granular Activated Carbons †.
- Author
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Ilavský, Ján and Barloková, Danka
- Subjects
ACTIVATED carbon ,DRINKING water ,SORPTION ,MICROPOLLUTANTS ,DRUGS - Abstract
The article deals with the removal of 20 selected drugs from drinking water by sorption on granulated activated carbon. Two different sorption materials were used, and the efficiency of removing these micropollutants was compared. Experiments were performed in laboratory conditions with two different values of pH of water (7.8 and 6.5, respectively), at laboratory temperatures and with an identical amount of added sorbent (Filtrasorb 400, WG12). Standard additions were made to drinking water, and the final concentration of 0.44–0.55 µg/L of pharmaceuticals was utilized in the experiments. Samples were taken after 30, 60, 120 and 240 min of contact of sorbent with water. The LC-MS method was used to analyze the selected pharmaceuticals, which was performed at the ALS laboratory in Prague, Czech Republic. The adsorption efficiency of the removal of the given pharmaceuticals from water, as well as the adsorption capacity of the granulated activated carbon for the given pharmaceuticals, depends on amount of time that the water and material were in contact. The adsorption efficiency for two different types of granulated activated carbon ranges from 13 to 90%. Water pH also influences the sorption abilities of granulated activated carbon. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
33. Detection of Change in Pattern of the Subsurface Soil Moisture Levels in India Using Soil Moisture Active Passive (SMAP)
- Author
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Raj, Sarath, Santosh, Anusha, Ramamoorthy, Sathiyagayathiri, Chaari, Fakher, Series Editor, Gherardini, Francesco, Series Editor, Ivanov, Vitalii, Series Editor, Cavas-Martínez, Francisco, Editorial Board Member, di Mare, Francesca, Editorial Board Member, Haddar, Mohamed, Editorial Board Member, Kwon, Young W., Editorial Board Member, Trojanowska, Justyna, Editorial Board Member, Xu, Jinyang, Editorial Board Member, Shukla, Anoop Kumar, editor, Sharma, Bhupendra Prakash, editor, Arabkoohsar, Ahmad, editor, and Kumar, Pradeep, editor
- Published
- 2023
- Full Text
- View/download PDF
34. A Comparison dataset on static test using two concentrations of hydrogen peroxide for prediction of acid mine drainage
- Author
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Muhammad Sonny Abfertiawan, Yoseph Palinggi, Mindriany Syafila, Marisa Handajani, and Kris Pranoto
- Subjects
Sulfide mineral ,Static test ,Net acid generating ,Acid-base accounting ,Acid mine drainage ,Computer applications to medicine. Medical informatics ,R858-859.7 ,Science (General) ,Q1-390 - Abstract
Acid mine drainage (AMD) is a serious problem in many coal and mineral mines. Over the past 50 years, many researchers have developed static tests that play an essential role in preventing AMD. In Indonesia, static tests are conducted using two methods: acid–base accounting (ABA) and net acid generation (NAG) tests. On an operational scale, mining companies commonly use the NAG test because it is simpler and faster than ABA. The NAG test is performed using hydrogen peroxide at a concentration of 15% as a strong oxidizing agent, according to the ARD Test Handbook and Indonesian National Standard (SNI). However, since 1990, an Indonesian coal mining company, PT Kaltim Prima Coal, is conducting NAG tests using 7.5% hydrogen peroxide. In the present dataset, we compared the results of NAG tests obtained using 7.5% and 15% hydrogen peroxide for 564 rock core samples. The dataset also shows the behavior of the NAG solution for each representative rock characteristic—including the concentrations of Fe, Mn, and SO4, oxidation reduction potential (ORP), conductivity, total dissolved solids (TDS), and temperature—during the test. This dataset can be useful for researchers to investigate the differences in the NAG test when 7.5% and 15% hydrogen peroxide are used, as well as to understand the oxidation behavior of sulfide minerals when hydrogen peroxide is used as a strong oxidizing agent for AMD.
- Published
- 2023
- Full Text
- View/download PDF
35. Mechanical properties and design method of composite slab with concrete shear keys.
- Author
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Li, Ming, Zhou, Zhijun, Lv, Xingbo, Wu, Xinyu, and Wang, Haoran
- Subjects
- *
CONCRETE slabs , *CONSTRUCTION slabs , *FINITE element method , *FAILURE mode & effects analysis , *SHEARING force , *STEEL bars , *COMPRESSIVE strength - Abstract
A new type of prefabricated composite concrete slab with shear keys arranged in a rectangular grid (CSWSK) is proposed. Its advantages are that it needs fewer steel reinforcing bars, and it does not require temporary support when being installed. We physically tested CSWSK and created finite element models (FEMs) to investigate bending performance, failure mode, influential factors and shear force distribution among shear keys under load. We derived simplified equations to calculate yield load and ultimate bearing capacity. CSWSK had a similar failure mode to a cast-in-place slab and a comparable bearing capacity (<4% difference). The row spacing, column spacing and cross-sectional area of the shear keys were the main factors influenced their mechanical behaviour. When these parameters were separately varied, yield load maximally varied by 12.1%, 14.4% and 13.4%, separately, and corresponding yield displacement maximally varied by 40.6%, 161% and 81.2%. The compressive strength of the upper layer of the composite slab and the coefficient of friction had little effect after a certain number of shear keys had been used. Shear force was greater for shear keys closer to the support than those nearer the centre of the slab. The derived simplified equations were accurate: the difference in results between the equations and physical test or FEM was <8%. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
36. Experimental Study on Flexural Behavior of Box Floors with Orthogonal Rib Beams Made of Poplar Laminated Veneer Lumber
- Author
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Xiangyu Su, Jing Chen, Yan Liu, Gong Meng, and Haida Wang
- Subjects
poplar laminated veneer lumber (lvl) ,box floor ,orthogonal rib beam ,static test ,flexural behavior ,Biotechnology ,TP248.13-248.65 - Abstract
This study examined the flexural behavior of the poplar laminated veneer lumber (LVL) box floor with orthogonal rib beams. Four 3.6 m × 4.8 m box floor samples made of poplar LVL orthogonal rib beams and oriented strand board (OSB) plates were tested under vertical uniform loading, from which the bearing capacity, stiffness, and failure characteristics were analyzed. There was no damage in all box floor samples at the normal service load of 2.5 kN/m2, and the maximum deflection was far less than the allowable value. When the maximum load was applied, the load-displacement curve of each floor sample exhibited a linear relationship without obvious failure. However, localized failure was manifested as the dislocation slip of the rib beams relative to the upper and lower floor slabs at the corner nodes and the joint expansion and staggered floors at the bottom plate, with obvious failure signs. The rib beam height had the most significant impact on the floor stiffness, followed by the spacing of short-side rib beams, whereas the OSB plate thickness had lest impact. The mid-span deflections of poplar LVL orthogonal ribbed box floor samples, which were calculated using the analog slab method, were in good agreement with the experimental results with an error being less than 10%.
- Published
- 2022
37. 新型轻钢铆接桁架组合楼板试验研究.
- Author
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莫禹凡 and 潘志宏
- Abstract
Riveting has the advantages of both construction and stress in thin-walled steel connections. A new type of light steel riveted truss composite slab was presented. In order to investigate the flexural capacity, the static loading test of three specimens was accomplished taking account of the steel ratio and rivet spacing. The research results show these as follows. The composite slabs have high stiffness, flexural capacity and ductility. The floor section conforms to the assumption of plane section in the elastic stage. The steel ratio and rivet spacing have significant influence on the mechanical properties of composite slabs. The steel ratio has the greatest influence on the stiffness and flexural capacity. According to setting the steel ratio and rivet spacing reasonably, it can ensure that the bottom steel plate, section steel and concrete are coordinated and stressed together to realize the combined action. [ABSTRACT FROM AUTHOR]
- Published
- 2023
38. Experimental and Numerical Study of the Flexural Performance of Spontaneous Combustion Gangue Coarse Aggregate Concrete Laminated Slab.
- Author
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Zhang, Kai, Zhou, Mei, Zhang, Boqun, Luan, Congqi, Li, Chao, Liu, Yan, Gao, Yue, and Yu, Yanfu
- Subjects
SPONTANEOUS combustion ,CONCRETE slabs ,CONSTRUCTION slabs ,FINITE element method ,PRECAST concrete ,DEAD loads (Mechanics) ,FAILURE mode & effects analysis - Abstract
(1) Background: to study the differences in flexural performance and failure characteristics of spontaneous combustion gangue coarse aggregate concrete (SCGAC) laminated slabs and ordinary concrete laminated slabs, comparative flexural performance tests of one ordinary concrete laminated slab and four spontaneous combustion gangue coarse aggregate concrete laminated slabs (SCGACLSs) full-scale specimens were carried out. (2) Methods: The loading method was four-point unidirectional static loading; the failure mode, load–deflection curve, load–reinforcement strain curve, and load–concrete strain curve of each specimen were analyzed. In addition, the load–deflection curve of the five slabs were predicted by ABAQUS. (3) Results: The five laminated slabs showed similar behaviors in terms of failure mode, load–strain curve, load–deflection curve, and deformation and all the properties satisfied the Chinese standard GB50010 (2010). Compared with ordinary concrete laminated slabs, the cracking load of SCGACLS with a precast layer of SCGAC(C30) decreased by 15.2% and the span deflection increased by 28.3% in the ultimate condition; however, when the strength grade of SCGAC of the precast layer was increased to SCGAC(C40), the cracking load increased by 7.8% and the span deflection was similar to that of the ordinary concrete laminated slabs. All specimens conformed to the planar section assumption. In addition, the finite element model (FEM) prediction results showed that the maximum relative errors of load and deflection were <5% and <10%, respectively, indicating that the established FEM had high prediction accuracy. (4) Conclusions: The defects of reduced load-carrying capacity and uncoordinated deformation caused by the different elastic modulus of precast and cast-in-place layer concrete can be compensated by appropriately increasing the strength grade of precast layer concrete of SCGACLSs. The application of SCGACLSs in structures is feasible. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
39. The comparison of 7.5 and 15% hydrogen peroxide as oxidizing agent in static tests of acid mine drainage potential in Indonesia
- Author
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Muhammad Sonny Abfertiawan, Yoseph Palinggi, Mindriany Syafila, Marisa Handajani, and Kris Pranoto
- Subjects
Acid mine drainage ,Static test ,Net acid generation test ,Hydrogen peroxide ,Science (General) ,Q1-390 ,Social sciences (General) ,H1-99 - Abstract
Static tests of acid mine drainage potential are an important part of mining water management. Net acid generation (NAG) test is widely used in Indonesian coal mines because of its convenience. This test uses H2O2 to oxidize sulfide minerals within rock samples to determine their net acid-forming capacity. This study aimed to determine the difference between H2O2 at concentrations of 7.5% (the standard in several Indonesian coal mines) and 15% (the standard of the Acid Rock Drainage Test Handbook and Indonesian National Standard) in categorizing rocks as potentially acid-forming and non-acid-forming and in terms of NAG solution characteristics. A total of 564 rock samples collected from two Indonesian coal mining sites were analyzed using pH, NAG, total sulfur, and acid-base-accounting tests. The results of the study showed that there was no significant difference in rock classification or the behavior of contaminants in the NAG solution between 7.5% and 15% H2O2. The characteristics of sulfide minerals in Indonesian coal mines were the main factors influencing the results of the NAG test and behavior of contaminants in the NAG solution. Therefore, H2O2 at a concentration of 7.5% can be used in Indonesian coal mines with relatively low total sulfur concentrations (
- Published
- 2023
- Full Text
- View/download PDF
40. A Resilient Approach to a Test Rig Setup in the Qualification of a Tilt Rotor Carbon Fiber-Reinforced Polymer (CFRP) Wing
- Author
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Pasquale Vitale, Gianluca Diodati, Salvatore Orlando, Francesco Timbrato, Mario Miano, Antonio Chiariello, and Marika Belardo
- Subjects
tiltrotor ,wing ,carbon fiber-reinforced polymer ,shear force and bending moment ,cross plot ,static test ,Motor vehicles. Aeronautics. Astronautics ,TL1-4050 - Abstract
The evolution of aircraft wing development has seen significant progress since the early days of aviation, with static testing emerging as a crucial aspect for ensuring safety and reliability. This study focused specifically on the engineering phase of static testing for the Clean Sky 2 T-WING project, which is dedicated to testing the innovative composite wing of the Next-Generation Civil Tiltrotor Technology Demonstrator. During the design phase, critical load cases were identified through shear force/bending moment (SFBM) and failure mode analyses. To qualify the wing, an engineering team designed a dedicated test rig equipped with hydraulic jacks to mirror the SFBM diagrams. Adhering to specifications and geometric constraints due to several factors, the jacks aimed to minimize the errors (within 5%) in replicating the diagrams. An effective algorithm, spanning five phases, was employed to pinpoint the optimal configuration. This involved analyzing significant components, conducting least square linear optimizations, selecting solutions that met the directional constraints, analyzing the Pareto front solutions, and evaluating the external jack forces. The outcome was a test rig setup with a viable set of hydraulic jack forces, achieving precise SFBM replication on the wing with minimal jacks and overall applied forces.
- Published
- 2024
- Full Text
- View/download PDF
41. Comparative Analysis of Static and Dynamic Pile Tests at the Site of the Astana Medical University Hospital in Nur-Sultan, Kazakhstan
- Author
-
Zhussupbekov, A. Zh., Yessentayev, A. U., Abdrakhmanova, B. G., Kaliakin, V. N., Karkush, Mahdi O., editor, and Choudhury, Deepankar, editor
- Published
- 2022
- Full Text
- View/download PDF
42. Experimentation of Magnetorheological Piston Damper
- Author
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Borhan, Nuradlin, Jaafar, Mohd Firdaus, Rahiman, Wan, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Jiming, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Hirche, Sandra, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Li, Yong, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Möller, Sebastian, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zamboni, Walter, Series Editor, Zhang, Junjie James, Series Editor, Mahyuddin, Nor Muzlifah, editor, Mat Noor, Nor Rizuan, editor, and Mat Sakim, Harsa Amylia, editor
- Published
- 2022
- Full Text
- View/download PDF
43. Evaluation of the static and multistage geocell pullout behavior in coarse grained soil
- Author
-
A. Namaei-kohal, A.R. Ardakani, and M. Hassanlourad
- Subjects
geocell ,pullout behavior ,coarse grained soil ,static test ,dynamic test ,Building construction ,TH1-9745 - Abstract
Geocell mattresses are one type of three-dimensional honeycomb soil reinforcements that is manufactured from polyethylene sheets using ultrasonically welded joints. This type of geosynthetics is commonly used to stabilize geotechnical problems in which the pullout failure is likely to occur. The present study has been conducted to evaluate the pullout behavior of a geocell by considering the effect of soil grain size. A series of 18 monotonic and 24 multistage geocell pullout tests were performed in sandy and gravely soil. The obtained geocell pullout loads were divided into two components: passive and frictional resistance. A previously made theoretical approach was used to measure the mobilized frictional and passive resistance components to evaluate the contribution of each mechanism. The results obtained from monotonic geocell pullout tests showed that the geocells exhibited hardening pullout behavior and the pullout failure occurred when the geocell material did not have any more pullout capacity to resist external load. Increases in the geocell height and soil grain size had significant effects on the passive component and it was seen that the contribution of geocell height developed passive resistance higher than the soil grain size. Furthermore, the multistage test results indicated that for removal of the geocell, the ultimate post-cyclic pullout load was less than the monotonic pullout load. This was the result of a reciprocating motion from loading caused by the interlock between the geocell infill soil and the surrounding material, which weakened and broke during the cyclic phase. As the coarseness of the soil increased, the interfacial strength increased. The theoretical approach did not single out the passive component between monotonic and multistage tests and the obtained passive resistance values were the same in these calculations. However, the cyclic loading could affect this component. Also, the soil particle size had a significant effect on the cumulative displacement during the cyclic phase.
- Published
- 2022
- Full Text
- View/download PDF
44. Modeling and Testing of a Composite Steel–Concrete Joint for Hybrid Girder Bridges.
- Author
-
Shangguan, Bing, Su, Qingtian, Casas, Joan R., Su, Hang, Wang, Shengyun, and Zhao, Rongxin
- Subjects
- *
BRIDGES , *STEEL-concrete composites , *GIRDERS , *IRON & steel bridges , *CONTINUOUS bridges , *CONCRETE beams , *FINITE element method , *DEAD loads (Mechanics) - Abstract
A hybrid girder bridge adopts a steel segment at the mid-span of the main span of a continuous concrete girder bridge. The critical point of the hybrid solution is the transition zone, connecting the steel and concrete segments of the beam. Although many girder tests revealing the structural behavior of hybrid girders have been conducted by previous studies, few specimens took the full section of a steel–concrete joint due to the large size of prototype hybrid bridges. In this study, a static load test on a composite segment to bridge the joint between the concrete and steel parts of a hybrid bridge with full section was conducted. A finite element model replicating the tested specimen results was established through Abaqus, while parametric studies were also conducted. The test and numerical results revealed that the concrete filling in the composite solution prevented the steel flange from extensive buckling, which significantly improved the load-carrying capacity of the steel–concrete joint. Meanwhile, strengthening the interaction between the steel and concrete helps to prevent the interlayer slip and simultaneously contributes to a higher flexural stiffness. These results are an important basis for establishing a rational design scheme for the steel–concrete joint of hybrid girder bridges. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
45. 大轴重运输条件下小跨度板梁 静动力适应性研究.
- Author
-
陈树礼, 刘永前, 陈士通, 许宏伟, and 崔春锴
- Subjects
LIVE loads ,CONCRETE slabs ,DEAD loads (Mechanics) ,CONCRETE beams ,REINFORCED concrete ,BRIDGES ,DYNAMIC loads ,ROLLING contact fatigue - Abstract
Copyright of Journal of Railway Science & Engineering is the property of Journal of Railway Science & Engineering Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2023
- Full Text
- View/download PDF
46. Research on the flexural behavior of a novel inter-module connection with a bolt and shear key fitting for modular steel buildings.
- Author
-
Hong-Lei Chen, Ke Cao, Chen Chen, and Guo-Qiang Li
- Subjects
- *
STEEL buildings , *BEHAVIORAL research , *FINITE element method - Abstract
Modular steel buildings (MSBs) can meet the needs of building industrialization and have been developed in many countries. The inter-module connection is crucial to the overall performance of MSBs. An inter-module connection with bolt and shear key fitting was proposed in this paper, which is convenient for the on-site erection of the steel modules. The flexural performance of the connection was studied. Static tests were carried out to study the contribution of the key load-bearing components to the flexural performance of the novel connection. A finite element model was then proposed and verified, by which a parametric analysis to study the effects of the key components was conducted. It is found that the parameters significantly affecting the flexural performance of the connection include the diameter of the bolt and the thickness of the bottom plate. The results also showed that the contribution of the shear key to the flexural performance of the connection could be ignored. The flexural performance of multi-module connection was studied, and the results revealed that the multi-module connection can be designed as multiple two-module connections. Formulas for calculating the flexural capacity and rotational stiffness of the connection were finally proposed and verified. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
47. The Removal of Selected Pharmaceuticals from Water by Adsorption with Granular Activated Carbons
- Author
-
Ján Ilavský and Danka Barloková
- Subjects
drinking water treatment ,pharmaceuticals ,adsorption ,granulated activated carbon ,static test ,adsorption efficiency ,Engineering machinery, tools, and implements ,TA213-215 - Abstract
The article deals with the removal of 20 selected drugs from drinking water by sorption on granulated activated carbon. Two different sorption materials were used, and the efficiency of removing these micropollutants was compared. Experiments were performed in laboratory conditions with two different values of pH of water (7.8 and 6.5, respectively), at laboratory temperatures and with an identical amount of added sorbent (Filtrasorb 400, WG12). Standard additions were made to drinking water, and the final concentration of 0.44–0.55 µg/L of pharmaceuticals was utilized in the experiments. Samples were taken after 30, 60, 120 and 240 min of contact of sorbent with water. The LC-MS method was used to analyze the selected pharmaceuticals, which was performed at the ALS laboratory in Prague, Czech Republic. The adsorption efficiency of the removal of the given pharmaceuticals from water, as well as the adsorption capacity of the granulated activated carbon for the given pharmaceuticals, depends on amount of time that the water and material were in contact. The adsorption efficiency for two different types of granulated activated carbon ranges from 13 to 90%. Water pH also influences the sorption abilities of granulated activated carbon.
- Published
- 2023
- Full Text
- View/download PDF
48. Structural Damage Identification Using the Optimal Achievable Displacement Variation.
- Author
-
Peng, Xi, Tian, Cunkang, and Yang, Qiuwei
- Subjects
- *
LINEAR equations , *LINEAR systems - Abstract
To ensure the safe use of structures, it is essential to develop efficient damage identification techniques. In this paper, a brand-new approach to identifying structural deterioration based on static displacement is proposed. First, the relationship between the displacement variation and the damaged element is derived from the static response equations before and after damage. Subsequently, the optimal achievable displacement variation is defined to determine the damage location in the structure. A progressive elimination strategy is suggested to identify the real damaged parts and weed out the pseudo-damaged elements by measuring the distance between the measured and the best possible displacement variation. After determining the damage location, the corresponding damage extent can be calculated by a system of linear equations. The proposed approach has been tested on a beam structure and truss structure using simulated and experimental data. Compared with the existing static sensitivity method, the suggested method does not result in misjudgment and has higher identification accuracy. It has been demonstrated that the suggested approach is effective at locating and assessing the extent of structural damage. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
49. 新型碳纤维板锚具设计及试验研究.
- Author
-
侯苏伟, 姜艳, and 张昊
- Abstract
Since traditional carbon fiber reinforced plastic(CFRP) plate anchors are prone to slippage and splitting, and the pre tightening force provided by bolts is difficult to control, the structure of traditional anchors needs to be improved. With theoretical analysis of the force mechanism of the new anchorage, the theoretical for the design of structural size of the anchorage was provided. A finite element software was used to simulate the forces on CFRP plate anchors under different parameters, and the design dimensions of the anchors were obtained for experimental research. The research results show that when the lateral displacement of the splint is 0. 65 mm, the maximum anchoring efficiency of the anchor is 89. 37%, and the CFRP plate is explosively destroyed. The research also demonstrates that the pre-tightening force can be controlled by the inner curved design of the anchor splint because of the displacement of the splint. The extrusion effect can be enhanced because of the curved design. [ABSTRACT FROM AUTHOR]
- Published
- 2022
50. Side shear strength and load-transfer mechanism of corrugated steel column–foundation socket connection
- Author
-
Baodong Liu, Linlin Zhang, Haibo Sun, Mingyang Feng, and Kangjian Dou
- Subjects
Accelerated bridge construction (ABC) ,Socket connection ,Static test ,Corrugated steel tube ,Mechanical interlocking ,Embedment depth ,Materials of engineering and construction. Mechanics of materials ,TA401-492 - Abstract
Accelerated bridge construction has received widespread attention globally owing to its cost-effectiveness. The integrity of the connections between precast bridge piers and other members of the structure is crucial for developing assembly substructures. This issue was examined in the present study. A novel corrugated steel tube socket connection (CSSC) was developed for column–foundation connections. The CSSC method is a rapid bridge construction method in which a prefabricated corrugated steel tubular concrete column and a corrugated steel pipe in the foundation are connected using concrete or ultra-high-performance concrete. A vertical monotonic static load experiment was performed on six CSSC specimens and one cast-in-place (CIP) specimen to investigate the slip performance, failure modes, and load-transfer mechanism. The side shear performances was compared among specimens with different parameters (connection method, embedment depth, presence of studs, and presence of concrete under the columns). The experimental results indicated that the CSSC specimens had better ductility values and higher axial bearing capacities than the CIP specimen. Increasing the embedment depth, adding studs, and adding concrete under the columns increased the ultimate bearing capacity. To accurately estimate the side shear performance of the CSSC, a reliable finite-element model was developed. An additional parametric analysis was performed to investigate the effects of different parameters on the vertical performance. The CSSC is effective connection type in the prefabricated column-foundation connection and is suitable for bridge high-gravity superstructures. Finally, design recommendations regarding the construction details of the CSSC were presented.
- Published
- 2022
- Full Text
- View/download PDF
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