为评定某大跨三塔斜拉桥的抗震性能,文章对该结构开展非线性地震响应分析。根据场地类型选取El Centro地震波、Chi-Chi地震波并进行调整,并于桥址处人工合成地震波一起作为结构地震动输入,考虑结构非线性以及边界非线性,采用Newmark-β逐步数值积分方法进行桥梁结构非线性时程分析,得到不同地震波激励下,结构位移及内力响应。 In order to evaluate the seismic performance of a long-span three-pylon cable-stayed bridge, this paper conducts a nonlinear seismic response analysis of the structure. According to the type of site, El Centro and Chi-Chi seismic waves are selected and adjusted, and synthetic seismic waves at the bridge site are used as input of structural ground motion. Newmark-β stepwise numerical integration method is adopted to consider the structure nonlinearity and nonlinearity of the bridge Nonlinear time-history analysis of structures, the displacement and internal force responses of structures under different seismic waves are obtained.