Research on Seismic Reduction of Long-Span Railway Suspension Bridge Located over V-Shaped Canyon

被引：0
|
作者：
Jiang H. [1 ,2 ,3 ]
Song G. [3 ]
Guo H. [1 ,2 ]
Zeng C. [3 ]
Lu W. [3 ]
Liu Z. [4 ]
Zhou Y. [5 ]
He Y. [6 ]
机构：
[1] China Academy of Railway Sciences Corporation Limited, Beijing
[2] State Key Laboratory for Track Technology of High-Speed Railway, Beijing
[3] School of Civil Engineering, Beijing Jiaotong University, Beijing
[4] Transport Planning and Research Institute Ministry of Transport, Beijing
[5] China Railway Economic and Planning Research Institute, Beijing
[6] China Railway Major Bridge Reconnaissance & Design Group Co., Ltd., Wuhan
来源：
Zhongguo Tiedao Kexue/China Railway Science | 2022年 / 43卷 / 01期
关键词：
Design earthquake; Energy-dissipating central buckle; Long-span; Non-uniform excitation; Railway; Rare earthquake; Suspension bridge; Viscous damper;
D O I：
10.3969/j.issn.1001-4632.2022.01.08
中图分类号：
学科分类号：
摘要：
Taking the kilometer-scale-span railway suspension bridge located in high-intensity area and crossed V-shaped canyon as the research object, the refined numerical model of the full bridge was established. Based on the response analyses of the bridge structure with the uniform excitation and non-uniform excitation considering the V-shaped canyon topography effect of the design and rare ground motion, the seismic performance and reduction of the bridge were studied. The results show that under non-uniform excitation, the internal force of the main tower, the longitudinal displacement of girder end, the tensile stress of cable and suspender are lower in different degrees than those under uniform excitation. While the bending moments at the main tower sections with variable thickness are close to the design limit, and the seismic response of the main girder end and flexible central buckle exceed the limit. Using energy-dissipating central buckle can reduce the longitudinal displacement of girder end by 49.78%, and solve the over-limit failure of tensile stress for flexible central buckle, but it will increase the internal force response of the west main tower. With setting viscous damper at the tower-girder connection, the bending moment, shear force and girder end displacement of the main girder can be reduced by 19.87%, 14.20%, and 70.55% respectively. However, the flexible central buckles are still damaged due to the excessive stress. The bending moment and shear force of the main tower, the girder end displacement, the stress of the main cable and suspender can be reduced by 24.01%, 18.84%, 72.42%, 7.14%, and 11.38% respectively by using the energy-dissipating central buckle and viscous damper. The peak internal force of energy-dissipating central buckle does not exceed the ultimate bearing capacity, which effectively controls the seismic response of the key structure members and meets the seismic fortification requirements of the bridge. © 2022, Editorial Department of China Railway Science. All right reserved.
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页码：63 / 74
页数：11
相关论文
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