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  2019,Vol.14no.4 ,page:781-789

Seismic Vulnerability Analysis of Small and Medium Span Girder Bridges Considering the Sliding of Bearing and Shear Key Damage
Abstract:      From the perspective of seismic designs of plate type elastomeric pad bearings and concrete shear key, a typical three-span prestressed concrete continuous girder bridge was taken as a case study. Combined with the probabilistic seismic demand analysis and the limit failure states of critical members such as piers and bearings, this study developed the vulnerability curves of the bridges with different models of bearings and shear keys and studies the Vulnerability characteristics of the small and medium-span bridge considering the slip effect of the bearing and the shear key damage. The results show that the seismic damage probability of the pier is obviously increased without considering the slip effect of bearings and the shear key damage, and the probability of the bearing damage is underestimated; the system vulnerability is significantly affected by the damage of bearings, and a reasonable limit device is needed for the bearing; the sliding effect of bearings and shear key damages should be considered in the seismic vulnerability analysis of small and medium span girder bridges.
Author NameAffiliation
Song Shuai College of Architecture and Civil Engineering, Taiyuan University of Technology, Taiyuan Shanxi 030024, China 
Wang Shuai College of Architecture and Civil Engineering, Taiyuan University of Technology, Taiyuan Shanxi 030024, China 
Wu Gang School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang Jiangxi 330013, China 
Keywords:    Bridge engineering  Seismic vulnerability  Sliding effect of bearing  Shear key damage  Finite element analysis
Received on:  March 27, 2019
考虑支座滑移及挡块破坏的中小跨径梁桥地震易损性研究
摘要:    从板式橡胶支座及混凝土挡块抗震设计角度,以一座典型的3跨预应力混凝土连续梁桥为例,结合概率地震需求分析及桥墩、支座等抗震关键构件极限破坏状态,建立不同支座及挡块分析模型的中小跨径梁桥地震易损性曲线,研究考虑支座滑移效应及挡块破坏的中小跨径梁桥的易损性特征。研究结果表明:不考虑橡胶支座的滑移效应及混凝土挡块破坏,桥墩地震破坏概率明显增大,且会低估支座破坏概率;桥梁系统易损性受支座破坏状态的影响显著,需设置合理的限位装置;在中小跨径梁桥地震易损性分析中,考虑支座的滑移效应及混凝土挡块的破坏十分必要。
关  键  词:桥梁工程  地震易损性  支座滑移效应  挡块破坏  有限元分析
基金项目:国家自然科学基金资助项目(51808376);中国博士后科学基金资助项目(2019M651076);山西省高等学校科技创新资助项目(20192L0276);江西省青年科学基金资助项目(20192BAB216032)
作者简介:宋帅,男,生于1987年。博士后,讲师。研究方向为桥梁抗震。E-mail:songshuai@tyut.edu.cn
引用本文格式:宋帅,王帅,吴刚.考虑支座滑移及挡块破坏的中小跨径梁桥地震易损性研究[J].震灾防御技术英文版,2019,14(4):781-789  DOI:10.11899/zzfy20190409
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