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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各塔塔底内力,但对主梁各跨与各塔的影响程度存在差别,应区别对待。
In order to study the effect of site effect on the seismic response of long-span multi-tower cable-stayed bridges, the finite element model of ANSYS was established based on the Jiashao Bridge. The stochastic seismic analysis method was used to calculate the random ground motion response analysis. The results show that the site effect has some influence on the displacements of the main girders and the internal force of each tower at the Jiaosha Bridge. The degree of influence is related to the assumption of the site differences. In addition, the relationship between setting rigid hinge structure and random seismic response of Jia Shao Bridge was analyzed. The research shows that setting rigid hinges will increase the longitudinal and vertical displacements of the main girder and the internal force of each tower bottom, but there is difference in the influence degree between each main girder and each tower and should be treated differently.