近远场地震下大跨度连续刚构桥地震易损性分析  

Near-and Far-field Seismic Vulnerability Analysis of Long-span Continuous Rigid Frame Bridge

作　　者：李鹏 曾娟 高榕 邹贻军 王剑明 LI Peng;ZENG Juan;GAO Rong;ZOU Yijun;WANG Jianming(Guangxi Urban-rural Planning Design Institute,Nanning 530000,China;Shanghai Municipal Engineering Design Institute(Group)Co.Ltd.Guangxi Branch,Nanning 530000,China;Chengdu Jitong Road&Bridge Technology Co.Ltd.,Chengdu 643000,China)

机构地区：[1]广西壮族自治区城乡规划设计院,南宁530000 [2]上海市政工程设计研究总院(集团)有限公司广西分公司,南宁530000 [3]成都济通路桥科技有限公司,成都643000

出　　处：《铁道建筑》2020年第12期5-9,14,共6页Railway Engineering

基　　金：交通运输部重点科技项目(2019-ZD5-027)。

摘　　要：基于概率地震需求分析方法,建立了西南山区典型高墩大跨度桥梁的理论地震易损性模型。考虑近远场地震动的随机性,运用OpenSees对桥梁开展时程分析,获得桥梁结构在近远场地震下的最大地震响应,基于对数正太分布假设,采用传统云图法对近远场地震下桥梁进行易损性分析。结果表明:典型大跨度高墩连续刚构桥各关键部位在近场地震下发生损伤的概率远高于远场地震的结果,近场地震动的频谱特性增大了桥梁结构的响应;在高烈度地震区易损性分析时必须考虑近场地震的影响;建立地震易损性曲线可以分析桥梁抗震性能,可为高烈度地震区类似桥梁抗震设计提供依据。Based on the probabilistic seismic demand analysis method,the theoretical seismic vulnerability model of a typical long-span bridge with high pier in southwest mountainous area was established.Considering the randomness of near-and far-field ground motions,the Opensees software was used to carry out time history analysis of bridges,and the maximum seismic response of bridge structures under near-and far-field earthquakes was obtained.Based on the assumption of logarithmic normal distribution,the vulnerability of bridges under near-and far-field earthquakes was analyzed by using traditional cloud method.The results show that the damage probability of each key part of a typical long-span continuous rigid frame bridge with high pier under near-field earthquake is much higher than that of far-field earthquake.The frequency spectrum characteristics of near-field vibration increase the response of bridge structure.The influence of near-field earthquake must be considered in vulnerability analysis of high intensity seismic area.The seismic vulnerability curve can be used to analyze the seismic performance of bridges and provide a basis for seismic design of similar bridges in high intensity seismic areas.

关 键 词：公路桥梁 地震易损性分析 近远场地震 连续刚构 云图法 

分 类 号：U448.23[建筑科学—桥梁与隧道工程] U442.55[交通运输工程—道路与铁道工程]