Structural vulnerability of longspan cablestayed bridge subjected to multiple damage scenarios effect(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2019年05期
- Page:
- 39-47
- Research Field:
- 桥梁与隧道工程
- Publishing date:
Info
- Title:
- Structural vulnerability of longspan cablestayed bridge subjected to multiple damage scenarios effect
- Author(s):
- XUE Xiaofeng; JIN Qiwen; WANG Tongxing
- （1. Key Laboratory of Bridge Detection Reinforcement Technology, Ministry of Communications, Chang’an University, Xi’an 710064, Shaanxi, China; 2. College of Civil Engineering and Architecture, Henan University of Technology, Zhengzhou 450001, Henan, China）
- Keywords:
- bridge engineering; performance degradation of stay cable; structural vulnerability; longspan cablestayed bridge; separated steel box girder; SHM
- PACS:
- -
- DOI:
- -
- Abstract:
- To study the vulnerability of the cablestayed bridge with long span and double cable planes, and optimize the sensor placement for structural health monitoring (SHM), the structural characteristics and mechanical properties of this type of bridge were considered. The buckling and stress safety factors were selected as evaluation indexes. One floating longspan cablestayed bridge with split column towers and split steel box girders and four cable was considered as an example, and the finite element model was established, and towers/girders 〖HJ1.65mm〗component, and cables component were simulated by elements Beam4 and Link10, respectively. The buckling safety factor and stress safety factor of the main beam under 149 working conditions in the three types of damage scenarios, such as overall performance degradation, single cable and singlepair cable broken, were calculated and analyzed. The proportion of structural damage and the corresponding damage degree were also considered. According to the principle that the minimum damage ratio causes the largest damage degree, the vulnerable cable subjected to three kinds of damage scenarios were studied and determined based on the Pareto optimization method.The results show that the cable force increases gradually with an increase in cable length, and the interior cable force inside is usually greater than that at the exterior. The overall performance degradation of the cable increases from nondamage to damage to 30% of the main girder. The buckling safety factor of the main girder show a linearly increases, while the stress safety factor show a linearly decreases, both the change range of them are small. Under single cable broken and single pair cable broken scenarios, cables 10# and 6# (both outside and inside) are the most vulnerable scenarios, and cables 1# to 5# and cables 7# to 9# follow. It can provide scientific basis and reference for the vulnerable parts of cables study of double tower and double cable planes steel box girders, sensor placement of this kind of bridge, and structural safety can be further enhanced. 2 tabs, 14 figs, 28 refs.
Last Update: 2019-10-16