基于有限单元法 ,推导出多自由度结构体系在地震作用下的增量形式的运动方程 ,建立了大跨度斜拉桥的地震激励模型。考虑结构的几何非线性 ,采用增量动力平衡迭代格式的Newmark β法进行非线性时程分析 ,并以某主跨 36 0m的斜拉桥为例进行了线性、非线性动力分析 ,验证了方法的可行性 ,同时表明大跨度斜拉桥的几何非线性影响因素不容忽视 Based on the finite element method, the incremental equations of motion for a multi-degree-of-freedom structural system under earthquake action are derived, and the seismic excitation model for long-span cable-stayed bridges is established. Taking the geometrical nonlinearity of the structure into account, the Newmark β method of incremental dynamic equilibrium iteration scheme is used to conduct the nonlinear time history analysis. The linear and nonlinear dynamic analysis of a 3600m cable-stayed bridge with a main span is conducted to verify the method The feasibility of this method is also demonstrated. The factors that influence the geometric nonlinearity of long-span cable-stayed bridges can not be ignored