摘要
为研究近断层地震作用下高速铁路桥梁地震响应,以国内某高速铁路刚构桥梁作为研究对象,采用OpenSees建立有限元模型,通过可靠度理论建立地震易损性曲线,对比分析近断层和远场地震作用下桥梁易损性,研究了近断层地震动速度脉冲效应对桥梁结构地震响应的影响。结果表明,相同地震强度作用下,有速度脉冲的近断层桥梁构件及系统在各损伤状态下的易损性明显高于远场地震动,桥梁系统在近断层及远场地震作用下的系统易损性均高于单个构件,采用单个构件的地震易损性评估系统易损性会高估桥梁的抗震性能;相对于一阶界限法,二阶界限法考虑了桥梁构件之间的相关性,易损性曲线上下界宽度较小,桥梁地震易损性评估更为精确;罕遇地震作用时,近断层地震作用下轻微损伤、中等损伤、严重损伤及完全破坏4种损伤状态的系统易损性相较于远场地震作用下分别高3、13、23、3百分点,近断层桥梁结构抗震性能评估应考虑速度脉冲效应对桥梁结构地震响应的影响。
To study seismic response of high-speed railway bridge under near-fault earthquake,this study took a high-speed railway rigid frame bridge as the sample of study,the whole bridge model was established by OpenSees and seismic fragility curves were established by reliability theory,bridge fragility under near-fault and far-field earthquakes were compared and analyzed.The influence of near-fault ground motion velocity pulse effect on seismic response of bridge structure was studied.The results showed that under the action of a near-fault earthquake with velocity impulse,the fragility of bridge members and systems in each damage state was significantly higher than that of far-field seismic motion.The fragility of bridge systems in near-fault and far-field seismic action was higher than that of a single component.The seismic fragility evaluation system using a single component could overestimate the seismic performance of the bridge.Compared with the first-order boundary method,the second-order boundary method took into account the correlation between bridge members.The upper and lower bounds of the fragility curves were smaller and the seismic fragility of the bridge was more accurate.In rare earthquakes,the system′s fragility under near-fault earthquakes increased by percent point of 3,13,23,3,respectively,compared with that under far-field earthquake.The influence of velocity pulse effect on seismic response of bridge structure should be considered in the evaluation of the seismic performance of bridge structure near fault area.
作者
梁岩
闫士昌
赵博洋
王艳
张朝阳
LIANG Yan;YAN Shichang;ZHAO Boyang;WANG Yan;ZHANG Chaoyang(School of Civil Engineering,Zhengzhou University,Zhengzhou 450001,China)
出处
《郑州大学学报（工学版）》
CAS
北大核心
2022年第4期80-85,91,共7页
Journal of Zhengzhou University（Engineering Science）
基金
国家自然科学基金资助项目(51608488)
河南省重点研发与推广专项(科技攻关)(212102310268)。
关键词
高铁桥梁
近断层
易损性
界限法
high-speed railway bridges
near-fault
fragility
boundary estimation method
