近断层地震输入角对连续刚构桥地震响应的影响  

Near Fault Earthquake Input Angle Influence on the Seismic Response of Continuous Rigid Frame Bridge

作　　者：刘鹏[1,2] 杨平[1] 曾永平[1,2] 袁明[1] 

机构地区：[1]中国中铁二院工程集团有限责任公司,四川成都610031 [2]西南交通大学土木工程学院,四川成都610031

出　　处：《工程抗震与加固改造》2015年第2期34-39,共6页Earthquake Resistant Engineering and Retrofitting

基　　金：中铁二院工程集团有限公司院级课题(13164190(13-15);14126165(14-15));四川省博士后基金资助课题

摘　　要：在采用时程分析进行桥梁抗震研究时,通常沿单一轴进行地震动输入,但是近断层地震动可能会产生速度脉冲,而速度脉冲可能存在于一个方向,也有可能存在于两个方向上,如果只沿单一轴输入地震波,也许就会得到过于保守的分析结果。本文选择2条近断层地震波和1条远场地震波,按15°间隔从0°～90°计算了7个输入角时桥梁的地震响应,发现连续刚构桥的地震响应随地震输入角的变化可能会有较大的不同,建议在进行近断层地震动时程分析时,最好考虑地震输入角的影响,为减小计算量,可采用每条地震波以0°和90°两个地震输入角进行计算并取二者中的较大者作为该条地震波计算结果。In the time history analysis of seismic research on bridge,seismic wave usually had been input along a single axis. However,the near fault ground motion may produce velocity pulse,and the pulse may exist in one direction or in two directions. If seismic waves had been input only along a single axis,the too conservative analysis results may be got. In this paper,two near fault earthquake waves and one far field seismic wave are selected,and the seismic response of the bridge is calculated when input angle according to 15 °from 0 ° ～ 90 °. It found that the responses changes with the different input angle of earthquake might have different seismic response of continuous rigid frame bridge. In the near fault ground motion time history analysis of continuous rigid frame bridge,earthquake input angle is proposed to consider. In order to reduce the amount of calculation,the larger one of seismic responses of bridge is adopted when input angles are 0 ° and 90 °.

关 键 词：连续刚构桥 近断层地震 速度脉冲 输入角 时程分析 

分 类 号：U442.55[建筑科学—桥梁与隧道工程] U448.23[交通运输工程—道路与铁道工程]