考虑桩土相互作用的近海刚构桥全寿命地震易损性分析  

Lifetime seismic vulnerability analysis of offshore continuous rigid frame bridge considering pile-soil interaction

作　　者：束景晓[1,2] 梁岩 童明娜[1] 崔玉坤 朱奕仰 SHU Jingxiao;LIANG Yan;TONG Mingna;CUI Yukun;ZHU Yiyang(School of Civil Engineering,Zhengzhou University,Zhengzhou 450001,China;Henan Province Expressway Network Management Center,Zhengzhou 450001,China)

机构地区：[1]郑州大学土木工程学院,河南郑州450001 [2]河南省高速公路联网管理中心,河南郑州450001

出　　处：《自然灾害学报》2024年第5期146-156,共11页Journal of Natural Disasters

基　　金：河南省自然科学基金资助项目(242300420001);中国博士后科学基金面上项目(2023M743217)。

摘　　要：为研究全寿命周期内近海高速铁路桥梁地震易损性,依托某高速铁路大跨预应力刚构桥,考虑桩土作用,通过量化损伤指标,通过增量动力分析,计算不同方向地震作用下近海桥梁构件易损性;并采用二阶界限法,建立桥梁系统全寿命地震易损性曲面,研究了近海高速铁路桥梁服役期内耐久性损伤后的时变地震易损性。研究结果表明:高速铁路大跨桥梁在设计地震作用下,桥梁系统顺、横桥向发生轻微损伤的概率为46.4%、15.1%;发生严重损伤的概率较小,在罕遇地震作用下,二者分别到达了18.7%、9.7%。桥梁顺桥向地震易损性大于横桥向,当考虑桩土作用后,系统易损性增大,但增大程度较小;桥梁系统在顺桥向罕遇地震作用下,出现严重损伤的超越概率增加1.1%。桥梁全寿命周期内,服役100 a时,桥梁设计地震作用下出现轻微损伤的超越概率比新建桥梁增大17.1%。高速铁路桥梁随着服役时间的延长,地震易损性逐渐增大,服役后期的耐久性损伤更为严重,地震易损性明显增大,但高速铁路桥梁全寿命周期内基本不会发生完全破坏。In order to study the seismic vulnerability of high-speed railway bridges in the nearshore area during their lifetime,based on a long-span prestressed rigid frame bridge of a high-speed railway,considering the pile-soil interaction,the vulnerability of components of the bridge under different seismic directions is calculated by quantifying the damage index and using the increment dynamic analysis(IDA).The second-order boundary method is adopted to establish the full-life seismic vulnerability surface of the bridge system,and the time-varying seismic vulnerability after the durability damage during the service life of the nearshore high-speed railway bridge is studied.The research results show that under the design seismic action of the long-span bridge of high-speed railway,the probability of slight damage to the bridge system in the longitudinal and transverse bridge directions is 46.4%and 15.1%,respectively;the probability of severe damage is small,and reaches 18.7%and 9.7%respectively under the rare earthquake action.The seismic vulnerability of the bridge in the longitudinal direction is greater than that in the transverse direction.When the pile-soil interaction is considered,the system vulnerability increases,but the increase is small.Under the rare seismic action in the longitudinal direction of the bridge,the exceedance probability of severe damage increases by 1.1%.During the whole life cycle of the bridge,when the service life is 100 a,the exceedance probability of slight damage under the design seismic action of the bridge is 17.1%higher than that of the new bridge.The seismic vulnerability of the high-speed railway bridge gradually increases with the increase of the service time.The durability damage in the later stage of the service life is more serious,and the seismic vulnerability increases obviously.However,the complete failure of the high-speed railway bridge does not occur basically throughout the whole life cycle.

关 键 词：高速铁路 桥梁 全寿命 地震易损性 耐久性损伤 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]