冻融循环作用下的钢筋混凝土梁桥地震易损性分析  

Seismic fragility analysis of concrete beam bridges under freeze-thaw cycles

作　　者：孙路 李廷辉 SUN Lu;LI Tinghui(Huzhou Vocational&Technical College,Huzhou 313000,China;Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China;Key Laboratory of Earthquake Disaster Mitigation,Ministry of Emergency Management,Harbin 150080,China;Huzhou Key Laboratory of Green Building Technology,Huzhou 313000,China)

机构地区：[1]湖州职业技术学院,浙江湖州313000 [2]中国地震局工程力学研究所地震工程与工程振动重点实验室,黑龙江哈尔滨150080 [3]地震灾害防治应急管理部重点实验室,黑龙江哈尔滨150080 [4]湖州市绿色建筑技术重点实验室,浙江湖州313000

出　　处：《自然灾害学报》2023年第5期167-176,共10页Journal of Natural Disasters

基　　金：黑龙江省高等教育教学改革研究项目(SJGZ20200101);浙江省基础公益研究计划项目(LGF22D020002);湖州职业技术学院高层次人才专项课题(2022GY22)。

摘　　要：基于冻融循环作用下混凝土力学性能退化规律,结合地震与冻融循环的不确定性,采用时变地震易损性分析方法对桥梁体系进行分析,提出了考虑冻融循环作用的混凝土梁桥地震易损性分析框架。研究结果表明,在冻融循环作用下,冻融桥墩截面的抗弯承载力和极限曲率随使用寿命的增加而退化,等效屈服曲率略有增加。随着冻融循环次数的增加,桥墩冻融区的力学性能不断退化,桥墩塑性铰从桥墩底部转移到冻融区。随着冻融循环次数的增加,桥墩与支座的地震易损性都表现出了先增大后减小再增大的现象。In this paper,a seismic fragility analysis framework for concrete beam bridges considering freeze-thaw cycle is proposed.Based on the degradation of the mechanical properties of concrete under the action of freeze-thaw cycles,combined with the uncertainty of earthquake and freeze-thaw cycles,the time-varying seismic fragility analysis method was used to analyze the bridge system.The results show that under the action of freeze-thaw cycles,the bending bearing capacity and ultimate curvature of the freeze-thaw pier section deteriorate with the increase of service life,and the equivalent yield curvature increases slightly.With the increase of the number of freeze-thaw cycles,the mechanical properties of the freeze-thaw zone of the pier continue to deteriorate,and the plastic hinge of the pier is transferred from the bottom of the pier to the freeze-thaw zone.With the increase of the number of freeze-thaw cycles,the seismic fragility of piers and bearings showed a phenomenon of first increasing,then decreasing and then increasing.

关 键 词：梁桥 易损性 冻融循环 地震 

分 类 号：U447[建筑科学—桥梁与隧道工程]