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重庆交通大学学报（自然科学版）

重庆交通大学学报（自然科学版） ›› 2023, Vol. 42 ›› Issue (3): 17-25.DOI: 10.3969/j.issn.1674-0696.2023.03.03

• 交通+大数据人工智能 • 上一篇    

基于易损性曲线的斜拉桥横向抗震性能评估

徐略勤1,2，贺洪滔1，张超1，徐意宏1   

  1. (1. 重庆交通大学 土木工程学院，重庆 400074； 2. 重庆交通大学 省部共建山区桥梁及隧道工程国家重点实验室，重庆 400074)
  • 收稿日期:2021-05-11 修回日期:2021-06-27 发布日期:2023-05-11
  • 作者简介:徐略勤(1983—)，男，江西上饶人，教授，博士，主要从事桥梁抗震方面的研究。E-mail: xulueqin@163.com 通信作者：贺洪滔(1994—)，男，重庆人，硕士研究生，主要从事桥梁抗震方面的研究。E-mail:hehongtao6221@163.com
  • 基金资助:
    重庆市技术创新与应用发展专项重点项目（cstc2019jscx-gksbX0047）；重庆市自然科学基金项目(cstc2019jcyj-msxmX0691)；重庆交通大学研究生科研创新资助项目（2021S0010）

Seismic Performance Evaluation of a Cable-Stayed Bridge along Transverse Direction Based on Fragility Curves

XU Lueqin1,2, HE Hongtao1, ZHANG Chao1, XU Yihong1   

  1. (1. School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China; 2. State Key Laboratory of Bridge and Tunnel Engineering in Mountainous Areas Jointly Constructed by the Ministry and the Province, Chongqing Jiaotong University, Chongqing 400074, China)
  • Received:2021-05-11 Revised:2021-06-27 Published:2023-05-11

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摘要： 针对斜拉桥在E1、E2 两水准设防地震作用下横向抗震性能的合理评估问题，采用增量动力分析方法（IDA）从构件和结构体系两个层面构建了背景工程的概率地震易损性曲线，研究了背景工程在两水准设防地震作用下出现轻微、中等、严重等3类损伤状态时的超越概率水平，以此评估斜拉桥的横向抗震性能。研究结果表明：在构件层面上，主塔、拉索、过渡墩和辅助墩在两水准设防地震下出现3类损伤状态的超越概率均低于40%，且大部分低于30%，而球型钢支座出现中等损伤的超越概率最大超过50%，是全桥横向抗震薄弱环节；在体系层面上，不论是一阶界限法还是二阶界限法，结构的损伤超越概率均明显高于各构件，且在两水准设防地震下发生中等损伤的概率最高（E2地震下一阶和二阶界限法最高分别达88.77%和85.22%），而严重损伤的发生概率低于40%。

关键词: 桥梁工程；斜拉桥；易损性曲线；抗震性能；构件；体系；两水准地震

Abstract: Aiming at the reasonable evaluation of lateral seismic performance of cable-stayed bridges under seismic fortification at both E1 and E2 levels, the incremental dynamic analysis method (IDA) was adopted to establish the probabilistic seismic fragility curves of the background bridge at the component and structural system levels. The exceedance probabilities of the three damage states, i.e. slight damage, medium damage and severe damage, of the background bridge under the dual-level design earthquakes were studied to evaluate the lateral seismic performance of cable-stayed bridges. The research results show that at the component level, the exceedance probabilities of the three types of damage states of the pylons, cables, transition piers and auxiliary piers under the dual-level seismic designs are all less than 40%, and most of them are lower than 30%. While, the maximum exceedance probability of moderate damage to spherical steel bearings exceeds 50%, which is a weak link in the transverse seismic resistance of the entire bridge. At the system level, whether it is the first order limit method or the second order limit method, the damage exceedance probability of the structure is significantly higher than that of each component. The probability of moderate damage under two-level earthquake fortifications is the highest (88.77% and 85.22% respectively for the first and second order limit methods under the E2 earthquake), while the probability of serious damage is less than 40%.

Key words: bridge engineering; cable-stayed bridge; fragility curves; seismic performance; component; system; dual-level design earthquakes

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