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

作　　者：彭刚辉[1] 贾宏宇[2] 陈波[1] 郑史雄[2] PENG Gang-hui;JIA Hong-yu;CHEN Bo;ZHENG Shi-xiong(The Engineering ＆Technical College of Chendu University of Technology,Leshan Sichuan 614000,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]成都理工大学工程技术学院,四川乐山614000 [2]西南交通大学土木工程学院,成都610031

出　　处：《铁道标准设计》2018年第6期56-61,共6页Railway Standard Design

基　　金：国家自然科学基金项目(51308465);中国博士后基金项目(2015M580031);中央高校基金项目(2682014CX004EM)

摘　　要：为了研究温度及时效对隔震简支梁桥的地震响应影响,主要介绍美国"AASHTO指导性隔震设计指南"提出的支座特性修正系数和调整系数,并结合国内隔震橡胶支座采用有限元软件ANSYS建立全桥模型进行力学数值仿真计算,根据桥墩高度不同共设置6种计算工况,地震动分析方法采用非线性时程法,从PEER地震动数据库中选取具有代表性的7条地震波进行抗震计算,并取计算结果平均值作为分析指标,分析结果表明:温度及时效作用会降低桥梁结构的基本周期,并会使隔震橡胶支座的剪力变大而位移变小;当桥梁结构基频较大时,温度及时效作用使墩顶位移、墩底弯矩及剪力值大幅增加;当桥梁结构基频较小时,可忽略温度及时效对墩顶位移产生的影响;同时,温度及时效在矮墩处对墩顶位移、墩底弯矩及剪力值的增大作用较明显,因此,建议对低温地区简支梁桥进行隔震设计时应采用隔震效果较好的支座,尽可能延长结构周期,同时在布置桥梁结构形式时应尽量避免出现矮墩,以减小温度及时效对桥梁结构产生的地震响应。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 muchas 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 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]