空间梁系结构极限荷载有限元解法

将有限元法引入结构稳定极限荷载分析中，从分析梁单元非线性几何方程入手，由其切线刚度矩阵的一般形式推导建立几何非线性劲度矩阵的具体形式，并实现对几种常见荷载的等效处理。根据分析结果，运用圆弧长法的数学策略，设计了计算程序，算例表明该程序运行结果良好。

FEM for Extreme Load on Space Structure

The problem of the extreme load on space structure under the condition of second type knuckling is often solved with a similar method.This paper tries to intruduce FEM into the solution of the above problem.For the second type knuckling of large span space structures,a nonlinear FEM model of space beam element is formed.In order to work out the extreme load on a structure,element stiffness matrix and load dealing matrix are put forword and a program is developed and used in a typical problem of an arch structure.