Model test on static performance degradation of cable-stayed bridge with cable rupture and main girder damage

被引：0
|
作者：
Ma Y. [1 ]
Peng A. [1 ]
Wang L. [1 ]
Zhang J. [1 ]
机构：
[1] School of Civil Engineering, Changsha University of Science & Technology, Changsha
来源：
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2022年 / 53卷 / 02期
基金：
中国国家自然科学基金;
关键词：
Cable fracture; Cable-stayed bridge; Main girder damage; Model test; Static performance;
D O I：
10.11817/j.issn.1672-7207.2022.02.028
中图分类号：
学科分类号：
摘要：
To study the effect of component damage on the structural static performance of cable-stayed bridge, the second Hejiang Yangtze River Bridge was used as a prototype and a segment model of cable-stayed bridge with a scale ratio of 1/40 was designed based on the similarity ratio theory and the stiffness similarity principle. The finite element model of the prototype bridge and the model bridge was established, and the static similarity analysis was carried out. The model tests of cable-stayed bridge under 8 groups of cable rupture and 12 groups of damaged main girder conditions were performed. The distribution of cable force, main girder stress and deflection under different damage conditions were studied. The influencs of cable failure and main girder damage on the static performance degradation of cable-stayed bridges were revealed. The results show that the cable-stayed bridge model can reflect the actual force status of the prototype bridge. The failure cables change the boundary support conditions of the main girder, and the damage of the main girder weakens the section bending moment of inertia and rigidity of the steel main girder, which is one of the main reasons for the performance degradation of the cable-stayed bridge. The cable force, main girder stress and deflection caused by the cable rupture in the middle span increase. The main girder area which is close to the side piers plays an important role in regulating the cable force and main girder stress of the whole bridge. It is suggested to increase the safety coefficient of the mid-span cable and the bearing capacity which reserves the main girder in the side pier area, the concrete crack resistance design is optimized. Load has significant effects on the stiffness degradation of the damaged main beam. For a cable-stayed bridge that has been in service for a long time, traffic flow and vehicle load should be restricted. © 2022, Central South University Press. All right reserved.
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页码：653 / 664
页数：11
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