随机地震下耗能构件关键参数对自复位桥墩地震响应的影响  

Influence of energy dissipation devices key parameters on seismic response of self-centering piers during random earthquake

作　　者：蒋丽忠[1,2] 付豪 周旺保 聂磊鑫[1] 王晓婵娟 蒋智勇 赵坚 蒋星宇 JIANG Lizhong;FU Hao;ZHOU Wangbao;NIE Leixin;WANG Xiaochanjuan;JIANG Zhiyong;ZHAO Jian;JIANG Xingyu(School of Civil Engineering,Central South University,Changsha 410075,China;National Engineering Laboratory for High-speed Railway Construction,Changsha 410075,China;Hunan Yunjing Construction Company Limited,Changsha 410119,China;Communications Planning,Survey&Design Institute Company Limited of Hunan Province,Changsha 410200,China)

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]高速铁路建造技术国家工程实验室,湖南长沙410075 [3]湖南云景建设有限责任公司,湖南长沙410119 [4]湖南省交通规划勘察设计院有限公司,湖南长沙410200

出　　处：《中南大学学报（自然科学版）》2024年第10期3779-3786,共8页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(52078487,52178180);国家重点研发计划项目(2022YFC3004304);湖南省科技人才托举工程项目(2022TJ-Y10);中南大学前沿交叉研究项目(2023QYJC006)。

摘　　要：自复位桥墩具有能够在震后快速恢复桥梁的使用功能。为了得到不同参数下耗能构件对于自复位桥墩地震响应指标的影响,取8度区的高速铁路双线简支箱梁桥作为研究对象,从Peer数据库中筛选出具有随机特征的40条地震波对有限元模型进行非线性时程分析,通过假设检验的统计学方法得到地震响应指标的分布规律和具有95%保证率的桥墩地震响应指标上界值。研究结果表明:在随机地震作用下,自复位桥墩各地震响应指标均服从正态分布;自复位桥墩在地震过程中具有较小的残余位移,随着耗能构件初始刚度和屈服力增加,墩顶最大位移逐渐减小,混凝土压应变和钢筋拉应变逐渐增大;在考虑地震随机性基础上,提出基于概率保证率的自复位桥梁耗能构件初始刚度和屈服力的合理取值范围,可为合理设置自复位桥墩耗能构件关键参数提供参考。Self-centering bridge piers can rapidly restore the functionality of bridges after earthquakes.In order to understand the influence of energy dissipation devices on the seismic response of self-centering bridge piers under different parameter conditions,a double-track simply supported box girder bridge for high-speed railway located in the eighth seismic intensity zone was selected as the research subject,and 40 earthquake ground motion records with random characteristics were selected from the peer database for conducting nonlinear time history analysis on the finite element model.The distribution pattern of seismic response indicators was determined by statistical methods of hypothesis testing.Upper-bound values of bridge pier seismic response indicators with a 95%confidence level were obtained.The results show that the seismic response indicators of self-centering bridge piers follow a normal distribution under seismic action.The self-centering piers exhibit small residual displacements during the earthquake process.As the initial stiffness and yield strength of the energy dissipation devices increase,the maximum displacement at the pier top gradually decreases,while the compressive strain of the concrete and tensile strain of the reinforcing bars gradually increase.Considering the randomness of earthquakes,a reasonable range of initial stiffness and yield force of self-centering bridge energy dissipation components based on probability guarantee rate is proposed,which provides reference for the reasonable setting of key parameters of self resetting bridge pier energy dissipation components.

关 键 词：震后快速修复 铁路自复位桥墩 耗能构件 随机地震 地震响应指标 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]