非对称混合梁斜拉桥行波效应和余震响应分析

Analysis on Traveling Wave Effect and Aftershock Response of Asymmetric Composite Girder Cable-stayed Bridge

以吉林省四平市165 m+45 m+45 m非对称混合梁斜拉桥为工程背景,结合其跨度大、混合主梁、主塔高、结构非对称特点,采用有限元分析软件建立MIDAS CIVIL三维空间模型。基于动力时程分析法,研究行波效应对非对称混合梁斜拉桥地震响应的影响。通过刚度折减来模拟主震过后各桥墩的损伤状态,计算结构在余震作用下的响应,进一步分析和比较在E1地震和E2地震作用下结构的位移和应力变化。

Taking the a(165+45+45)-m asymmetric composite girder cable-stayed bridge in Siping City of Jilin Province as the engineering background,and combined with the characteristics of its long span,main composite girder,high main pylon and asymmetric structure,the finite element analysis software is used to establish the MIDAS CICIL 3D space model.Based on the dynamic time-history analysis method,this paper studies the influence of traveling wave effect on the seismic response of asymmetric composite girder cable-stayed bridge.The stiffness reduction is used to simulate the damage conditions of various bridge piers after the principal earthquake and to calculate the structural response under the influence of aftershocks in order to further analyze and compare the displacement and stress changes of the structure under the influences of E1 earthquake and E2 earthquake.