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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 Guangdong Architecture Civil Engineering is the property of Guangdong Architecture Civil 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.)

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.)

Copyright of Transportation Science & Technolgy is the property of Transportation Science & Technology 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.)

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.)

为研究方钢管混凝土柱与H型钢梁槽型端板连接节点的抗震性能，对3个槽型端板连接节点和1个普通端板连接节点开展了低周往复加载试验，研究了节点的破坏机理与特征、承载能力、节点区应力分布以及抗震性能等，分析了节点构造参数不同对其抗震性能的影响。在试验研究基础上，采用ABAQUS有限元软件进行了有限元适应性验证和参数分析，对比了槽型端板连接节点和普通端板连接节点承载力、延性和转动刚度的差异性。试验研究表明：试件均在端板和梁翼缘连接处出现对接焊缝撕裂以及焊缝附近母材断裂现象，普通端板发生了明显翘曲，与柱翼缘之间出现明显缝隙；试件滞回曲线均呈现梭形，没有明显的捏缩现象，说明具有良好的耗能能力；相较于普通端板连接节点而言，槽型端板连接节点极限承载力和转动刚度分别平均提高了6.5%和29.7%、延性和耗能能力分别平均下降了16.7%和14.5%，表明采用槽型端板对节点转动刚度的影响最显著。建议设计中槽型端板侧面伸出长度取柱宽的一半即可满足要求。

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.)

Copyright of Computer Measurement & Control is the property of Magazine Agency of Computer Measurement & Control 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 Architectural Journal / Jian Zhu Xue Bao is the property of Architectural Journal 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.)

The strength of the geocell depends on the strip strength and junction strength, and the matching of the geocell strip material and junction also has a certain influence on the strength of the geocell. The effects of specimen shape(dumbbell-shaped, narrow rectangular, wide rectangular)and specimen width on the strength and tensile deformation characteristics of polypropylene (PP) geocell strips were studied by indoor uniaxial tensile test of strips and junction taken from fused polypropylene geocell. The failure mode and strength of fused junction under different stress states should also be compared. The results show that the tensile strength and elongation of the three shape samples from large to small is wide rectangle, dumbbell shape, narrow rectangle. The effect of sample width on the tensile properties of PP geocell strips is significantly greater than that of sample shape. The tensile mechanical properties are good when the fusion joint is combined with PP strip. The strength of fused junction under different stress states from large to small is: shear strength, opposite tensile strength, peel strength. The test results can provide reference for the production and application of geocell and the study of reinforcement mechanism. [ABSTRACT FROM AUTHOR]

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.)

Copyright of Guangdong Architecture Civil Engineering is the property of Guangdong Architecture Civil 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.)

Against the background of the increasing trend of fragmentation of freight demand, the spatial structure analysis of urban networks using road Less-Truck-Load (LTL) dedicated lines has positive implications for enriching the flow space theory and empirical evidence. Based on the social network analysis method, this study used the data of the national prefecture-level and above cities' road LTL dedicated lines on the China Communications Logistics LOGINK System in 2018, and conducted feature mining of Chinese city network relationships from the perspective of road LTL dedicated lines at three levels: city nodes, intercity connections, and sub-networks. The results show the following: (1) Shanghai, Tianjin, Zhengzhou, Guangzhou, and Hangzhou dominated the network. Based on the cargo flow organization coefficients, urban nodes can be divided into four types: strong center, second strong center, weak center, and subordinate. The number of high-grade cities in the network was relatively small and mainly concentrated in the eastern and central regions. The imbalance in the spatial distribution is obvious. (2) Among the top ten cities in terms of the amount of first contact, the ratio of export-oriented cities to import-oriented cities is 4:1, which reflects the imbalance in cargo flow. The network space carved by the road LTL dedicated lines data showed a significant distance attenuation law. The road LTL dedicated lines connections are mainly distributed in the intercity range of 0-200 km and the interprovincial range of 200-500 km, with the number of special lines concentrated in 500 km accounting for 41.9%. (3) The community detection algorithm was used to identify six urban communities with significant regional characteristics, including the Northeast Jilumeng, Zhongyuan, Guanzhong, Jianghuai, Pan-Pearl, Delta-Yangtze River Delta, and Changzhutan communities. The community structures showed clear spatial agglomeration and cross-administrative features. (4) To enhance the status of the nodes of the road LTL network and optimize the organization of the network space, the following suggestions are put forward: Urban networks based on the road LTL dedicated line data should enhance the service capacity of the Chengdu-Chongqing urban agglomeration road LDL line, strengthen the industrial agglomeration and driving role of core cities, optimize the industrial structure of marginal cities, strengthen the integration of transportation and industry, and actively guide the car-free carrier platform to improve the efficiency of road freight organization. In future studies, long-term cycles and multiple data sources should be enhanced to verify the validity and reliability of the findings. [ABSTRACT FROM AUTHOR]

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.)

In order to explore the characteristics of Cd and As accumulation in different rice under Cd and As combined pollution, 11 southern representative rice varieties were selected in soil culture experiments. The results showed that there were significant yield differences among 11 rice varieties, and the highest was 65. 9 g / pot. There were also significant differences in Cd and As contents among all rice varieties(p<0. 05). The Cd content in rice(2. 70 mg / kg) of Z Liangyou 68 was the highest, and the Cd content(0. 39 mg / kg) in rice of Nipponbare was the lowest. The former is 6. 92 times that of the latter. The As content(0. 46 mg / kg) in rice of Yuzhenxiang was the highest, and the As content(0. 11 mg / kg) in rice of Nipponbare was the lowest. The highest is 4. 12 times the lowest. Therefore, low-accumulation rice planting can reduce the risk of Cd and As transmission along the food chain. At the same time, the Cd and As contents of rice stem nodes were significantly different and showed different accumulation rules. The node Cd content increased from the base to the top, and the node As content decreased from the base to the top. Correlation analysis showed that the contents of Cd and As in rice were significantly positively correlated with the contents of Cd and As in nodes. The content of As(Ⅲ) in rice was positively correlated with the content of As(Ⅲ) in nodes. However, the content of As(Ⅴ) in rice was only significantly correlated with the content of As(Ⅴ) in node 1 and node 2(named by node 1, 2, 3 and 4 from top to bottom of stem nodes). The results showed that controlling the transportion of Cd and As at nodes may be important to block the accumulation of Cd and As in rice. [ABSTRACT FROM AUTHOR]

Copyright of Guangdong Architecture Civil Engineering is the property of Guangdong Architecture Civil 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.)

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.)

The underground granary has the advantages of energy conservation, land saving, low temperature, and environment protection. However, resistance of water and moisture from the groundwater has been main concerns for storing grains in underground granary. A plastic-concrete waterproof system using the polypropylene plastic (PP) as the waterproof layer was proposed. In this system, the plastic plate and concrete components were connected with plastic studs. Three plastic-concrete testing models were designed and fabricated based on the different stud spaces for the underground granary. In order to analyze the failure mode, failure mechanism, internal force and deformation of the plastic members under the water pressure, hydraulic loading tests were carried out. The test results showed that: the internal stress and displacement of the plastic plate increased with the increase of water pressure; the larger tensile force appeared at the joint area with the maximum stress unevenly distributed; the stress at mid-span was small with the maximum stress uniformly distributed. The displacement at the mid-span of the plastic plate increased linearly with increase of water pressure, whereas the displacement displacement at the joint changed slightly. On the basis of experimental analysis, the optimal design measures were proposed for the plastic-concrete waterproof system with plastic plate of 10 mm and given connection joints. When the water pressure reached its bearing capacity the failure modes of the plastic-concrete waterproof system were changed with change stud spacing. For the stud space of 200 mm, the joint weld seam was damaged at the water pressure of 180 kPa, which indicated that the overall water pressure bearing capacity of the testing model could be improved by enhancing the weld strength at the joint. For the stud space of 300 mm, the plastic plate was damaged with the water pressure capacity of 80 kPa, which indicated that the overall water pressure bearing capacity of the testing model could be enhanced by increasing the plate thickness. For the stud space of 400 mm, the joint weld seam was destroyed when the water pressure reached 38 kPa, the overall water pressure bearing capacity of the testing model could be enhanced by increasing the strength of the joint weld seam. The research results can provide a reference for waterproof design of the underground granary. [ABSTRACT FROM AUTHOR]

Copyright of Guangdong Architecture Civil Engineering is the property of Guangdong Architecture Civil 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.)

Aiming at the problems of LEACH algorithm energy consumption leading to premature death of nodes in traditional wireless sensor networks，an improved algorithm based on LEACH algorithm was proposed in this study. This algorithm firstly assigned different weighted probabilities to the selection of common nodes and cluster - head nodes，and considered the total energy of the current node and all nodes at the same time on the threshold value. Then，this algorithm realized the cluster division with the help of Veno diagram，and used the optimized A * algorithm to realize multi - hop transmission technology. Simulation results showed that the improved algorithm had achieved good results on dead nodes and energy consumption. After the maximum cycle times，the number of surviving nodes was 5 times of the original algorithm，and the remaining energy of nodes was 8. 8 times of the original algorithm. [ABSTRACT FROM AUTHOR]

The underground granary is an important technical development for building a new system of green grain storage. Compared to the overground granary, the underground granary can make full use of the underground space, which shows significant advantages such as low temperature, loss reduction, eco-friendly environment, land saving, energy saving and safety in grain storage. Currently, such technology is one of the important research interests in the food industry. A new type of underground granary consisting of precast steel plate-concrete composite walls was proposed, and the corresponding mechanical properties of its wall and joints were studied for guiding the design of it. Firstly, two different finite element models of the two pieces of precast steel plate-concrete composite walls with different connecting modes were established with ANSYS software. One model is assumed that the walls connect with a joint, which is modeled as a short steel plate, and another is assumed to be weld together directly without introducing a joint. Their bending and compression properties were simulated and analyzed. Also, in the finite element simulation, Solid 185 element was used to model the concrete part, Shell 63 element was used to model steel plates, and the rigid connection was assumed by arranging common nodes between adjacent elements on the interface of concrete and steel plate. Secondly, the corresponding joint experiments were carried out to verify the simulation results. In the experiment, the steel plate and concrete are connected by bolts in each piece of composite wall. The steel plates of the two composite walls are connected by welding them together with a short connecting steel plate, and thus their connections are assumed to be rigid as well. Practically, in order to simplify the finite element models, the effects of bolts and rebar reinforcements in the real steel plate-concrete composite wall were represented by rigid connection assumptions. Numerical results showed that, for the case of empty granary, which means no internal pressure was applied on the internal surface of the composite wall, the stress concentration occur in the steel plate-concrete composite wall under the external soil and water pressure, but the maximum stress not exceeded the design value, so the prefabricated steel plate-concrete composite wall is safe. During the tests, the separation of steel plate and concrete in each specimen not happened and they worked well as an entire element. Besides, the connecting plate between the two precast steel plate-concrete composite walls looked reliable and no obvious crack damage or excessive deformation. All welding lines kept intact. The numerical results of the maximum deflection along the whole span of the jointless and jointed specimens were 0.7mm and 0.57mm, respectively, and the latter was 18.6% smaller than the former. The numerical predictions of the maximum axial displacement of the jointless and jointed specimens were 1.03mm and 1.01mm, respectively, with a slight difference of 1.94%. Besides, it is observed that the difference between the numerical results and the experimental results was no more than 4% and 10% for the jointless and jointed specimens, respectively. From the comparison, it is concluded that the experimental results are basically same as the finite element results and the established finite element model is verified. Also, the results indicate that the assumption of rigid joint between the two steel plate-concrete composite walls is reasonable. More importantly, it is found that the mechanical properties of the steel plate-concrete composite wall with joint connection are similar to those without joint. Thus, in the practical engineering, the steel plate-concrete composite walls for the underground granary can be mechanically equivalent to the steel plate-concrete composite wall without joint connection. It provides guidance for the design and test of composite wall joint. [ABSTRACT FROM AUTHOR]

Copyright of Journal of South China University of Technology (Natural Science Edition) is the property of South China University 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.)

The study of rip currents by intersecting waves is helpful to the comprehensive study of disaster mechanisms and risk assessment. To better understand the characteristics of rip currents controlled by hydrodynamic forcing and longshore topographical variability,an experimental study on rip currents by intersecting waves over barred beaches with rip channels is conducted. The investigation focuses on the distribution characteristics of rip currents resulting from intersecting waves and longshore topographical variability. Analytical results of velocity distribution measurements by acoustic Doppler velocimeters are presented for the distribution characteristics of rip currents on barred beaches with rip channel. The location and width of rip currents are controlled by rip channel and wave nodes,and the length of the rip currents depends on the wave height and coastal slope. The driving force of rip currents without rip channel is primarily determined by the alongshore pressure gradient of the wave setup caused by intersecting waves. By contrast,the driving force of rip currents with rip channel is determined by both the alongshore pressure gradient of the wave set-up and the radial stress gradient,and the relative magnitude of the two values depends on the wave period. [ABSTRACT FROM AUTHOR]

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.)

Topology optimization technology was introduced into the design of nodes in cable-strut structures. Taking several typical nodes in a herringbone ribbed cable dome structure as research objects, the optimization program Altair Solidthinking Inspire was used to carry out static topology optimization under given load cases, where maximization of stiffness under volume constraint and minimization of mass under stress constraint were taken as optimization objectives. Key topology features were further extracted from the optimized results and new models were built by the usage of Evolve, leading to nodes with rational load-bearing behavior and design aesthetic perception. Finite element software ABAQUS was employed to analyze and compare the mechanical property of optimized nodes with initial designed ones in order to comment on the mechanical performance of the new designed nodes. For the nodes which are supposed to directly provide the stiffness，maximization of stiffness under volume constraint should be chosen as the primary optimization objective. For the nodes that serve as connecting components rather than providing stiffness, minimization of mass could be the optimization objective. Finally, additive manufacturing is utilized to realize practical manufacturing of the optimized nodes with complex and irregular geometry. [ABSTRACT FROM AUTHOR]

In recent years, modular steel construction has become one of the major topics in the field of construction industrialization, in which the design of the connection is crucial. In this context, the author introduced the development of modular steel construction at home and abroad with three levels: the component level, the structure level and the architectural level. Furthermore, the author summerized the configuration and research progress of connections in modular steel construction at the three different levels. It is found that there have been various types of connections for modular steel construction in practice. However, limited research can be found on their mechanical behavior. The related research far lags behind the engineering practice, which limited the application of modular steel construction in high-rise buildings and seismic areas. Therefore, it is urgent and important to carry out researches on the load-transferring mechanism, seismic performance and design theory of connections in modular steel construction. This paper gives state-of-the-art review on the connection in modular steel construction. The future trends in this field are also given from the authors point of view based on our recent research work and achivements. [ABSTRACT FROM AUTHOR]

This paper reviews the main theory and technology progresses in tulmlar structures in the recent ten more years from three levels, i.e.，structural members, connections and systems. A number of issues, including application of new material, development of new cross-section type, diversity of loading conditions, and necessity of increased calculation accuracy，promote the research on structural behavior and design method of tubular members made of steel as well as other metals and composite materials. To satisfy the requirements of architecture appearance, structural load transfer, erection, and construction technology, tubular connections often have various configurations. Meanwhile, there are developments of new materials and emergence of new connection components such as cast-steel joint. Therefore, there is a need to continually investigate the static performances of these novel connection types. Especially, a more in-depth investigation on the deformability, hysteretic behavior, fatigue behavior, and fracture resistance of the tubular connections will be the key issues in the future. Even a tubular structure system holds the common characteristic of structure of bar systems, there are still some new challenges when it is applied in prefabricated assembled structures，especially for the efficient connection patlern adapt to closed section members. [ABSTRACT FROM AUTHOR]

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.)

In order to investigate the seismic performance and failure mechanism of prestressed steel reinforced concrete beam to steel-tube reinforced concrete column joints, three prestressed and one non-prestressed steel reinforced concrete beam to steel-tube reinforced concrete column joints were tested under low cyclic lateral loading. The testing process and failure mode were observed under different prestressing level and axial compressive ratio, and the bearing capacities, stiffness, ductility, energy dissipation capacity as well as deformation performance were studied. In addition, the stress variations of steel tube and stirrups in the panel zone, the longitudinal bars and I-shaped steel at the end of beams, and the longitudinal bars and steel tube at the end of columns were analyzed. The test results indicate that, for the three prestressed specimens, a mixed failure pattern of bending failure at the end of beam occurs first, followed by the shear failure in the panel zone. However, the non-prestressed joint failed at the beam ends. The lateral load-displacement hysteretic curves of the tested specimens show a plump shape with good energy dissipation capacities and ductilities. The cracks in the tensile zone at the ends of the beams could be delayed and the lateral load capacity could be increased with the increase of prestressing level. The increase of axial compression ratio lead to only a small change in the lateral load capacity, but could lead to significant decreases of the ductility and energy dissipation capacity. The increase of the prestressing level and the axial compression ratio decreases the shear deformation of panel zone. The research can provide technical support for the application of the new type of struction in seismic area. [ABSTRACT FROM AUTHOR]

Copyright of Computer Measurement & Control is the property of Magazine Agency of Computer Measurement & Control 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.)

In order to study the reliability problem of rainwater pipe network in the running process, the SWMM (Storm Water Management Model) and Monte Carlo Method were adopted to analyze and calculate the reliability of each node in the rainwater pipeline system. The pipe diameter, roughness and pipe laying deviation were set as random variables and the limit equation was established based on the water level of the nodes in the drainage system. The program of Monte-Carlo Method was written in MATLAB, and then a model presenting the real pipeline network was built in SWMM. A data transformation interface was developed between these two platforms to conduct the calculation of nodes' reliability in the pipeline network system automatically. The results show that the nodes with low reliability can be found instantly in the whole system, which is beneficial to renovating and maintaining the rainwater pipeline engineering with accurate target and high efficiency. [ABSTRACT FROM AUTHOR]

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.)

Copyright of China Sciencepaper is the property of China Sciencepaper 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 Guangdong Architecture Civil Engineering is the property of Guangdong Architecture Civil 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.)

通过示范工程,从住宅建筑模数化设计入手,对一种轻钢装配式住宅进行了标准化建筑、结构、围护体系设计。为实现钢结构住宅的模数化、标准化、系列化和装配化,初步实现住宅产业化,工程主体结构采用纯钢框架,梁、柱均为热轧H型钢;楼板和屋面板选用工厂预制的PK预应力混凝土叠合板,施工阶段不需铺设模板,可减小现场作业量,有效缩短工期;外墙板采用钢丝桁架混凝土复合墙板与竹筋陶粒混凝土复合墙板两种形式,与普通的加气混凝土砌块加外保温相比,具有轻质、节能、安装速度快,墙板缝隙少、墙板厚度小、有效房间使用面积大、抗震性能好等优点。

对监测区域进行有效地覆盖以及最大限度延长网络生存周期是无线传感器网络研究的重点课题之一。为此,提出了一种基于节点调度策略的能量有效覆盖算法,该算法通过泊松分布模型构造节点概率密度公式,依照节点密度公式对所关注的目标进行有效覆盖;另一方面,通过节点自身状态调度机制更新以及对邻居节点进行匹配调度的动态转换,使得传感器节点剩余能量与节点消耗能量趋于平衡,从而达到延长网络生存周期。仿真实验结果表明,该算法可实现对监测区域的有效覆盖,同时优化了网络资源的配置,延长了网络生存周期。

厦门市海峡交流中心二期2号塔楼建筑物主体高度215m,高宽比为4.8,属超B级高层建筑,采用了钢管混凝土框架-核心筒结构体系。本文对该工程的结构荷载取值和地震作用取值、自振特性、风和地震作用下的计算结果等内容进行了介绍,并且对中震不屈服分析和动力弹塑性分析等方面也进行了较为深入的探讨。通过对计算结果的分析比较,证明结构设计成功解决了结构超限问题,结构设计是安全可靠的。文章最后介绍了针对本塔楼进行的新型钢管混凝土梁柱节点试验研究成果。本文的有关方法和结论可为相关工程提供参考。

倒槽钢可便捷地连接管截面和实腹截面,本文论述了钢管柱与钢梁倒槽钢连接节点的弯矩-转角特性的数值分析结果。本文通过建立恰当的有限元模型,探讨了不同节点构造对节点弯矩-转角特性的影响,所研究的节点参数包括柱截面形式、梁端节点类型、倒槽钢的方向和高度等。有限元分析的结果表明:（1）连接圆钢管的节点要比连接方钢管的节点具有更高的强度与刚度;（2）倒槽钢的高度越高,节点的刚度和强度越低;（3）与柱子焊接时,倒槽钢的翼缘与梁的翼缘平行会比二者相垂直的方式具有高得多的刚度与强度;（4）如梁端采用平端板,圆钢管柱与钢梁的倒槽钢连接节点具有足够的刚度和强度,可将其视为半刚性节点及部分强度节点,并在半连续节点设计中应用。

对3个方钢管混凝土柱穿芯高强螺栓-端板节点试件进行了伪静力试验研究。采用有限元程序ANSYS对节点进行了循环荷载作用下的三重非线性有限元分析,研究了轴压比、混凝土强度、高强螺栓预拉力、端板厚度及端板加劲肋等因素对节点滞回性能的影响。结果表明,轴压比和混凝土强度对节点滞回性能影响较小,减小高强螺栓预拉力将显著降低节点的耗能能力,端板加劲肋和端板厚度对节点性能有明显的影响,但设置加劲肋比增加端板厚度对改善节点性能更有效。试验与计算结果表明,穿芯高强螺栓-端板节点具有很好的强度、刚度、延性和耗能能力。

本文在建立了高温下钢管混凝土柱-钢梁外加强环节点有限元分析模型的基础上,分析了在不同恒高温下环板宽度、钢管厚度、钢梁翼缘宽度和厚度、梁高等参数对节点抗弯承载力和初始刚度的影响。在此基础上建议了高温下节点抗弯承载力和初始刚度的简化计算方法,并用欧洲规范EC3的连接分类方法对高温下节点刚性进行了分析。

铝合金结构由于其自重轻、耐腐蚀、易加工等特点,已被建筑工程界越来越多的关注和采用。国内已在工业建筑、体育建筑和展览建筑中建成多座铝合金结构建筑物,并形成了上海市建设标准《铝合金格构技术规程》,编制了国家规范《铝合金结构设计规范》。目前铝合金结构工程的结构体系分别为单层网壳结构和双向桁架结构,构件断面形式分别为工字形载面和圆管截面,构件的连接节点形式有板式节点和球节点,连接方式以机械连接居多,也有少量焊接连接节点,其构件材料牌号的选用为6061和5083。本文在概述铝合金材料特性的基础上介绍了上海地区大型公共建筑中的铝合金结构工程,及其结构体系、材料选用、节点形式、构件断面和尺寸等。通过工程介绍和相关数据的比较,提出了铝合金结构工程设计时结构体系的选择、构件连接方式的确定和构造措施采取等应关注的几个方面,可供铝合金结构工程设计的参考。

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近年来,在组合结构中出现一种新型的结构形式,即由钢筋混凝土柱和钢梁（RCS）组成的框架结构。本文较为系统地阐述国际上RCS组合结构抗震性能的研究情况。主要包括RCS梁柱节点的试验研究、RCS组合框架的试验研究和有限元分析、RCS组合结构的抗震设计及性能分析,以及美日“设计指南”的完善与发展。最后指出RCS结构研究存在的问题和今后的研究趋势。

本文对三组修复、加固过的梁柱焊接节点进行了试验研究。三组试件中最简单的一个节点为除去旧有的开裂焊接材料 并用延性好的焊接材料重新焊接。另外两个节点分别考虑了连接在梁翼缘的水平加劲板的作用和连接上下两个翼缘的 垂直三角板的作用。研究表明这三种节点能够提供变化范围在百分之二到百分之四的塑性转动能力。

近年来,在组合结构中出现了一种新型的结构形式,即由钢筋混凝土柱和钢梁（RCS）组成的框架结构。工程应用实践表明,梁柱采用两种不同的材料可以发挥材料各自的优点,从选材上具有合理性和经济性。作为主要传力部件的PCS节点是RCS框架研究的关键问题。本文较为系统地阐述了RCS节点在国内外的研究及应用情况,并指出了研究中存在的问题。

沈阳博览中心室内足球场是我国第一个室内足球场,其屋盖跨度为144m,采用了全钢结构双向正交正放空间桁架。本文介绍了足球场钢结构屋盖竹设计情况,对其中具有创新性的节点构造和计算进行了较为详细的描述,同时对结构整体计算中一些问题的处理也作了简单的介绍。

本文通过沪东造船厂船体装焊车间大跨度、大柱距钢管混凝土柱的设计研究,论述了在大吊车荷载作用下,钢管混凝土柱比其他形式的柱更为经济,更为合理;对柱脚、牛腿、肩粱以及钢管混凝土组合柱的节点构造与受力性能提出了新的看法;并简单介绍了钢管混凝土组合柱的计算要点。

本文详细介绍了武汉国际会展中心主楼位于标高为39.100～42.900之间跨度为59.5m具有较小竖向刚度的上部空间钢桁架的设计和安装,该钢桁架的节点及桁架支撑体系的设计均具独特性,而所采用的自重达230t空间钢桁架的整体吊装方法更是国内首创。可供类似结构设计、安装时参考。

超文本交互系统是由用户、任务、界面组成的一个复杂的人机交互系统.超文本系统信息量大,强调用户对阅览进程的自主控制,因此用户在阅览时容易出现迷路、遗漏等问题.综合目前的研究成果,系列化组织文本,合理设计节点和超链接,结合使用导航工具,是提高用户阅览绩效和舒适度的有效手段.