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The large-span prestressed concrete beam bridge has been widely used due to its advantages of high structural stiffness, smooth and comfortable traffic, good seismic performance, and mature construction technology. However, after a long period of service, such bridges may develop cracks in their structure due to the long-term effects of natural environment and overloading, which can affect their safe carrying capacity. This problem is particularly prominent for long-span bridges over the sea. Therefore, in order to accurately assess the actual working condition and carrying capacity of an in- service long-span prestressed concrete beam bridge over the sea, on-site static and dynamic load tests on a bridge that has been in service for 15 years are conducted. The characteristics such as vibration mode were analyzed using finite element analysis. The research results indicate that the structural performance of the bridge remains good, but the actual carrying capacity has decreased due to structural damage and crack formation caused by the environmental conditions in the marine area and long-term service. The findings of this study can provide reference for the maintenance and strengthening of similar in-service bridges. [ABSTRACT FROM AUTHOR]

In this paper, a new type of material structural member of basalt bar alkali-activated sea sand concrete (BASC) beam was proposed. In order to study the bending performance of BASC beams, five concrete beams were fabricated. The effects of basalt fiber reinforced polymer (BFRP) reinforcement ratio and different reinforcement types on the bending performance and failure modes of alkali-activated sea sand concrete (ASC) beams were studied. The test results show that the increase of the reinforcement ratio of BASC beams has little effect on the cracking load, but it can effectively improve its ultimate load. Taking the reinforcement ratio of 0.27% as the reference group, when the reinforcement ratio increases to 0.48%, 0.75% and 1.08%, the ultimate bearing capacity of BASC beams increases by 109.46%, 119.60% and 189.66%, respectively. Compared with ordinary steel bars, the elastic modulus of BFRP bars is smaller. With the same reinforcement ratio, the cracking load of ordinary steel bar ASC beams is 50%, larger than that of BASC beams. The theoretical calculation models of bending capacity, maximum crack width and deflection of normal section are proposed. Due to the influence of chloride ion diffusion in ASC, the calculation model needs to be modified. The calculated values of BASC beams after fitting are in good agreement with the experimental values, which can provide reference for the application of BASC beams in ocean engineering. [ABSTRACT FROM AUTHOR]

In order to improve the crack resistance of ordinary concrete continuous girder bridges in the negative moment, the 1 ∶5 scale model girder was designed and subjected to the flexural test as a prototype of a 30 m prestressed concrete simple supported-continuous T-beam. The failure mode, mid-span load-displacement relationship and strain, crack distribution, and stiffness degeneration were investigated. The finite element model of the test beam was established using the finite element software ABAQUS, which was used to analyze the effect of different wet joint materials, concrete strength grades in the precast section, longitudinal reinforcement rates and UHPC tensile strength on the flexural performance of the beam. The test results showed that the new structural wet joint design was reasonable and can improve the overall stiffness, durability and safety of the beam to meet the actual requirements of the project. The introduction of UHPC could effectively limit the crack width, significantly increase the rigidity of normal concrete (NC) sections. The test values were well fitted with the model simulation values, indicating that the finite element model established had certain accuracy and applicability. The parameter analysis showed that improving the reinforcement ratio could significantly increase the ultimate bearing capacity and post-cracking stiffness of the beam, but had little effect on the cracking load and pre-cracking flexural properties. The use of UHPC instead of plain concrete C30 as the wet joint material obviously improved the load carrying capacity and stiffness of the beam, which verified the reasonableness of this design scheme. The tensile strength of UHPC could improve the ultimate load carrying capacity of the beam by a small margin, and had little effect on flexural capacity before cracking. While the tensile strength of UHPC had almost no effect on the load carrying capacity, stiffness and damage deflection of the whole beam. [ABSTRACT FROM AUTHOR]

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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.)

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Desert sand from Xinjiang was used as fine aggregate to partially replace engineering sand, and basalt fiber was mixed into concrete to make 9 high-strength desert sand concrete beams with different shear span ratios, basalt fiber content and different hoop ratios. Shear failure tests were carried out by two-point symmetric loading. Based on acoustic emission technology and fractal theory, the damage evolution process of shear beams was studied, and the law between the damage evolution of shear beams and different variable factors was quantitatively analyzed. The results show that the cumulative acoustic emission energy increases exponentially with the failure process of the beam. The energy parameters and the fractal dimension of the beam surface crack increase with the increase of the load level, and the maximum fractal dimension reaches 1. 206. Under the same load level, the damage of the beam is the least when the shear span ratio is 1. 5 and the fiber content is 0. 4%. Based on acoustic emission parameters and fractal dimension of cracks on the test beam surface,a shear damage model is established. [ABSTRACT FROM AUTHOR]

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To study the effects of bamboo fiber and steel wire mesh on the flexural ductility of basalt fiber reinforced polymer（BFRP）bar concrete beams, 7 BFRP bar concrete beams with bamboo fiber and steel wire mesh were tested with different bamboo fiber lengths (0 mm, 30 mm and 45 mm) and different steel wire mesh layout ranges (0, 1/2 maximum bending moment point layout and full beam length layout). The flexural failure tests of the 7 beams were carried out, and the initial crack loads, the crack developments, the ultimate loads and the deformations were detected. The effects of the fiber length and the wire mesh layout range on the crack resistance and the deformation resistance of the specimens were analyzed based on the test data. With the function model, the equivalent yield points of the 7 test beams were obtained, and their ductility coefficients were calculated. The results show that, the addition of bamboo fiber and steel wire mesh increases the cracking loads of BFRP bar concrete beams by 12%~68%, decreases the crack spacings and the crack length development speed, reduces the test beam deformation under the same load, and increases the ductility coefficient by 1.58%~31.75%. [ABSTRACT FROM AUTHOR]

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Copyright of China Plastics / Zhongguo Suliao is the property of Journal Office of CHINA PLASTICS 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.)

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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.)

To study the mechanical properties and failure modes of corroded reinforced concrete beams under impact, this paper conducts impact tests on concrete beams by Fujikake et al. The validity of impact force time history curve, mid-span displacement time history curve and failure mode of the fine finite element model of reinforced concrete beam structure established by finite element software ANSYS/LS-DYNA was checked. Based on the verified finite element model, the influence of corrosion rate of reinforcement on the impact resistance of concrete beams was researched. The finite element analysis shows that The concrete spalling degree of concrete member under impact effect increases with the increase of steel corrosion rate. The higher the degree of steel corrosion, the more serious the concrete spalling. All the corroded RC beams at different impact heights exhibit flexural failure characteristics. Steel corrosion has a certain influence on the impact resistance of reinforced concrete members. At the same drop weight impact height, the peak impact force decreases with the increase of steel corrosion rate, and the mid-span displacement increases with the increase of steel corrosion rate. When the impact height is 3.0m, the peak value of impact force decreases to 17.9% and the mid-span displacement is 33.3% when the corrosion rate is 30.0%. [ABSTRACT FROM AUTHOR]

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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.)

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.)

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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.)

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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.)

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.)