同济大学学报（自然科学版）2017，Vol.45Issue(12)：1744-1754,11.DOI:10.11908/j.issn.0253-374x.2017.12.003
非一致地震激励下飘浮体系斜拉桥易损性分析
Fragility Analysis of Floating Cable-stayed Bridge Under Non-uniform Seismic Excitation
摘要
Abstract
The finite element model of a cable-stayed bridge with the main span of 420 m was built with OpenSees software.Fragility analysis was performed under four conditions considering incoherence effect only,incoherence and wave-passage effects,incoherence and site-response effects and spatial variation due to incoherence,wave-passage and site-response effects.System fragility curves were generated combining joint probabilistic seismic demand model (JPSDM) with Monte Carlo simulation based on component fragility.The system vulnerability of the cable-stayed bridge under non-uniform excitation considering different sources of spatial variation effects is higher than that under uniform excitation.The effects of incoherence and site-response are obvious to the seismic response of the cable-stayed bridge.With the increase of incoherence factor,the bridge as a system becomes more fragile.The site-response effect is more complicated,and the bridge tends to be more vulnerable if the soil types of nearby exciting locations become more different.The vulnerability of the cable-stayed bridge increases when the soil type along the direction of propagation turns from relative soft to firm than the inverse condition.Neglecting wave-passage effect in fragility analysis would not cause an obvious error.Above all,incoherence and site-response effects should be considered in the fragility analysis of the floating cable-stayed bridge under non-uniform excitation.The widely adopted fragility analysis under uniform excitation at the current time overestimates the aseismic behavior of the system.关键词
飘浮体系斜拉桥/地震动空间效应/非一致地震激励/体系易损性Key words
floating cable-stayed bridge/seismic spatially varying effect/non-uniform seismic excitation/system fragility分类
建筑与水利引用本文复制引用
马凯,钟剑,袁万城,党新志..非一致地震激励下飘浮体系斜拉桥易损性分析[J].同济大学学报（自然科学版）,2017,45(12):1744-1754,11.基金项目
土木工程防灾国家重点实验室基金(SLDRCE14-B-14) （SLDRCE14-B-14）
国家自然科学基金(51478339,51778471) （51478339,51778471）
江西省科技计划(20151BBG70064) （20151BBG70064）
“十二五”国家科技支撑计划(2015BAK17B04) （2015BAK17B04）
