中文摘要：

为研究场地效应对大跨度多塔斜拉桥地震响应的影响，以嘉绍跨江大桥为工程背景，建立了ANSYS有限元模型，采用随机地震分析方法对考虑场地差异的结构随机地震动响应进行了数值分析。结果显示，场地效应对嘉绍跨江大桥各跨主梁位移及各塔塔底内力存在一定的影响，其影响程度与场地差异的假定有关。此外，分析了设置刚性铰构造与否和嘉绍跨江大桥随机地震响应之间的关系，研究表明设置刚性铰将增大主梁纵向和竖向位移以及塔柱的内力状况，但对主梁各跨与各塔的影响程度存在差别，应区别对待。

英文摘要：

In order to study the impact of site effect on large-span cable-stayed bridge tower seismic response, taking the jiashao river-spanning bridge as background, we established structural model of ansys, and researched structural random seismic response of large-span multi-tower cable-stayed bridge under the random seismic effect considering site difference. The results show that there exist effect on displacement of girder at each span and internal forces in the bottom of each tower by site effect, the level of the effect is related to assumption of site difference. In addition, the relationship between rigid hinge and seismic response of jiashao river-spanning bridge was analyzed, the research shows that installation of rigid hinge increases the displacement of girder at each span and internal forces in the bottom of each tower, but the results of tower andspan is different from each other, it should be discriminated.