铁道标准设计2018，Vol.62Issue(6)：56-61,6.DOI:10.13238/j.issn.1004-2954.201707120007
温度及时效对隔震简支梁桥地震响应的影响
Influence of Temperature and Aging on Seismic Response of Simply Supported Beam Bridge with Seismic Isolation
摘要
Abstract
In order to study the effect of temperature and aging on seismic response of simply supported beam bridges with seismic isolation,the correction factors and adjustment coefficients of bearing characteristics proposed by the United States AASHTO Guideline for Isolation Design are introduced.In combination with domestic seismic isolation rubber bearings,a full bridge model is established with finite element software ANSYS,and mechanical numerical simulation is conducted.According to the pier height difference,6 kinds of working conditions are set up.The ground motion analysis is performed with nonlinear time history method,7 representative seismic waves are selected from the PEER ground motion database for seismic calculation,and the average of the calculated result is taken as the analysis index.The analysis results show that:temperature and aging will decrease the basic period of bridge structure,and the shear of the isolation rubber bearing becomes larger and the displacement smaller;when the foundation frequency of bridge structure is large,temperature and aging have greater influence on pier head displacement,pier bottom bending moment and shear force;when the foundation frequency of bridge structure is small,the influence of temperature and aging on the displacement of pier top can be neglected;meanwhile,the influence of temperature and aging on pier head displacement,pier bottom bending moment and shear force tends to decrease with the increase of pier height.Therefore,it is suggested that bearings with better isolation effect should be adopted in seismic isolation design of simply supported beam bridge in low temperature area so as to extend the structural period as much as possible,and short pier should be avoided in the layout of the bridge structure to reduce the seismic response of bridge structure generated by temperature and aging.关键词
隔震简支梁/地震响应/温度及时效/非线性时程法/桥梁结构基频Key words
Simply supported beam bridges with seismic isolation/Seismic response/Temperature and aging/Nonlinear time history method/Fundamental frequency of bridge structure分类
交通工程引用本文复制引用
彭刚辉,贾宏宇,陈波,郑史雄..温度及时效对隔震简支梁桥地震响应的影响[J].铁道标准设计,2018,62(6):56-61,6.基金项目
国家自然科学基金项目(51308465) （51308465）
中国博士后基金项目(2015M580031) （2015M580031）
中央高校基金项目(2682014CX004EM) （2682014CX004EM）
