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介绍用几何非线性及材料非线性耦合的方法分析大跨度桥梁的极限承载力问题。几何非线性采用UL列式法，材料非线性采用分层有限单元法，两者结合达到了既保证计算精度又节省内存及机时的目的。通过算例验证，该法已被成功地应用于一座铁路是索桥方案的极限承载力分析。
The problem of the ultimate bearing capacity of long-span bridges with geometrical nonlinearity and nonlinear material coupling is introduced. The geometric non-linearity adopts the UL-based method and the material nonlinearity adopts the stratified finite element method. The combination of the two achieves the goal of not only ensuring the calculation accuracy but also saving the memory and the machine time. The results of numerical examples show that this method has been successfully applied to the analysis of ultimate capacity of a railway bridge.