Research on the Progressive Failure-collapse Dynamic Behavior of Steel Truss-concrete Composite Bridge

被引：0
|
作者：
Zheng X.-B. [1 ,2 ]
Zhang G. [1 ,2 ]
Huang L.-X. [1 ,3 ]
Tang C.-H. [1 ]
Xiong X. [1 ]
Ding Y.-H. [1 ]
机构：
[1] School of Highway, Chang'an University, Shaanxi, Xi'an
[2] Key Laboratory of Transportation Industry of Bridge Detection Reinforcement Technology, Shaanxi, Xi'an
[3] Dongguan Road-Bridge Investment & Construction Co. Ltd., Guangdong, Dongguan
来源：
Zhongguo Gonglu Xuebao/China Journal of Highway and Transport | 2022年 / 35卷 / 11期
基金：
中国国家自然科学基金; 上海市自然科学基金;
关键词：
bridge engineering; explicit dynamic analysis; member significance factor; progressive failure path; steel truss-concrete composite continuous beam bridge;
D O I：
10.19721/j.cnki.1001-7372.2022.11.014
中图分类号：
学科分类号：
摘要：
The damages in bridge members and the collapses in entire structures usually happens, with the arises in the traffic, resulting heavy injures and economic losses. Compared to other bridge structural systems, the steel truss-concrete composite bridge is lack of redundancy, indicating that this type of bridge is venerable to the structural collapse caused by the initial failures in members under heavy traffic load. Thus, it is vitally important for the theory and engineering to determine the collapse mechanism and mode of steel truss bridge. This paper presents a study for member significance, damaged structure and dynamic collapse performances of a steel truss-concrete composite continuous beam bridge, using elastic energy and explicit dynamic numerical method. The results indicate that the minimum redundancy factor is 1.94 for the damaged bridge with failed lower chord in the area of the largest positive bending moment in side span, while the minimum factor is 1.61 for the damaged bridge with failed bar in the vicinity of the side support. The damaged bridge, with the failed lower chord in the area of positive bending moment, collapses following the mechanism of rotating hinge. This mechanism has long failure paths, with the maximum vertical displacement of 60.1 cm before the entire collapse. In contrast, the damaged bridge, with the failed bar in the vicinity of support, collapses following the mechanism of slip surface. Leading the critical brittle collapse, this mechanism has extremely short failure paths, with the merely maximum vertical displacement of 9.1 cm before the entire collapse. Thus, the mechanism of slip surface, caused by the failure in bars near supports, is the most critical for steel truss-concrete composite bridges, and is prevented by special design. This research, on the failure paths of steel truss-concrete composite bridge, investigates the member significance and collapse mechanism, providing the theoretical basis and design method for enhancing the resist performance for progressive failure-collapse in this type of bridges. © 2022 Xi'an Highway University. All rights reserved.
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页码：147 / 159
页数：12
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