东南大学学报（英文版）2019，Vol.35Issue(4)：464-475,12.DOI:10.3969/j.issn.1003-7985.2019.04.009
两水准设防下大跨度悬索桥全桥系统基于性能的抗震评价分析
Performance-based system seismic assessment for long-span suspension bridges under two-level seismic hazard
摘要
Abstract
Since there are few studies on the performance-based seismic evaluation of the long-span suspension bridge system under two-level earthquake hazard in Chinese code,the developed procedure of this study can be regarded as a general program to assess the seismic performance of the overall system for long-span suspension bridges.In the procedure,the probabilistic seismic demand models of multiple bridge components were developed by nonlinear time-history analyses incorporating the related uncertainties,and the componentlevel fragility curves were calculated by the reasonable definition of limit states of the corresponding components in combination with seismic hazard analysis.The bridge repair cost ratios used to evaluate the system seismic performance were derived through the performance-based methodology and the damage probability of critical components.Furthermore,the repair cost ratios of the overall bridge system that was retrofitted with fluid viscous dampers for the main bridge and changed restraint systems for the approach bridges were compared.The results show that peak ground velocity and peak ground acceleration can be selected as the optimal intensity measurements of long-span suspension bridges using the TOPSIS (technique for order preference by similarity to an ideal solution).The bridge repair cost ratios can serve as accurate evaluation indicators to provide an efficient evaluation of retrofit measures.The seismic evaluation of long-span bridges is misled when ignoring the interaction of adjacent structures.However,the repair cost ratios of a bridge system that has optimum seismic performance are less sensitive to the relative importance of adjacent structures.关键词
悬索桥/易损性曲线/地震危险性分析/修复成本比/系统抗震性能Key words
suspension bridge/fragility curve/seismic hazard analysis/repair cost ratio/system seismic performance分类
交通工程引用本文复制引用
鲁冠亚,王克海,张盼盼..两水准设防下大跨度悬索桥全桥系统基于性能的抗震评价分析[J].东南大学学报（英文版）,2019,35(4):464-475,12.基金项目
Basic Scientific Research Service Project of Central-level Public Welfare Research Institute (No.2016-9018). （No.2016-9018）
