主余震下近海钢筋混凝土桥墩全寿命抗震分析  

Life-cycle seismic performance analysis of offshore RC bridge piers under mainshock and aftershock

作　　者：陈炫维 李宏男[1] 王东升[2] 李超[1] 

机构地区：[1]大连理工大学建设工程学部,辽宁大连116024 [2]大连海事大学道路与桥梁工程研究所,辽宁大连116024

出　　处：《地震工程与工程振动》2015年第4期145-154,共10页Earthquake Engineering and Engineering Dynamics

基　　金：国家重点基础研究发展计划(973项目)(2011CB013605);国家自然科学基金项目(51178071);教育部新世纪优秀人才支持计划项目(NCET-12-0751);辽宁省高等学校优秀人才支持计划项目(LJQ2013053)

摘　　要：我国近海桥梁具有服役期长、工作环境恶劣并且面临较高的地震作用风险等特点。本文分析了全寿命周期内高性能混凝土中氯离子腐蚀作用,采用10组相同台站记录的实际主余震记录构造出新的主余震地震序列,利用增量动力分析(IDA)和地震易损性方法分析了主余震地震序列和氯离子腐蚀对桥墩抗震性能的影响。分析结果表明:在轻微破坏状态下,服役时间和地震序列对桥墩地震易损性影响不大;在中等破坏、严重破坏和完全破坏状态下,服役时间和地震序列作用均对桥墩地震易损性有很大影响,桥墩更容易进入危险状态。Offshore bridges have characters of long-service time,severe working condition and relatively high risk of suffering earthquakes. The life-cycle influence of chlorine ions corrosion in high performance concrete is analyzed. Ten sets of mainshock-aftershock station records are chosen and formed into new mainshock-aftershock seismic sequences. The influence of mainshock-aftershock seismic sequence and chlorine ions corrosion on seismic performance of a bridge pier is analyzed using incremental dynamic analysis and seismic fragility analysis methods. The results show that service time and seismic sequence have limited influence on seismic fragility of a bridge pier when the pier is under the state of slight damage. However,service time and seismic sequence both have great influence on seismic fragility of a bridge pier when the pier is under the state of moderate damage,extensive damage and complete damage,and a bridge pier is easier to enter a dangerous state.

关 键 词：近海桥梁 主余震 氯离子腐蚀 地震易损性分析 

分 类 号：TU352.1[建筑科学—结构工程] P315.91[天文地球—地震学]