【摘要】 为分析处于软土地基上的大跨度斜拉桥在长周期地震动下的反应,通过ANSYS有限元软件和SHAKE土层地震反应分析程序等辅助软件,基于Penzien模型建立了某大跨度斜拉桥的整体有限元模型。选取一条长周期地震波和一条普通地震波比较分析了自由场地的地震反应,并在此基础上对考虑土-结构相互作用的斜拉桥地震响应进行了研究。结果表明,长周期地震动对软弱土层产生的不利影响要远远大于普通地震动,部分土层产生液化并丧失承载能力,同时,软土地基上的大跨度斜拉桥对长周期地震动十分敏感,结构的地震响应要明显大于普通地震动作用下的响应。更多还原

【Abstract】 In order to analyze the long-period seismic response of long-span cable-stayed bridge on soft foundation,an integral finite element model of a long-span cable-stayed bridge based on Penzien model was built by using some assistant softwares just like ANSYS software and SHAKE soil stratum seismic response analysis program.The seismic response of free field was comparatively analyzed by choosing a long-period seismic wave and a normal seismic wave.Based on this,the seismic response of cable-stayed bridge in consideration of soil-structure interaction was investigated.It is observed that(1) the adverse effect of long-period seismic ground motion on soft foundation is far more greater than that of normal seismic ground motion,and certain soil layer was liquefied and lost bearing capacity;(2) the long-span cable-stayed bridge on soft foundation is quite sensitive to long-period seismic ground motion,and the seismic response of the structure to this seismic ground motion is much greater than that to normal seismic ground motion.更多还原