Abstract: In this paper, second order nonlinear analgsis is incre ased on the basis of refeve-nce[1]. Large displacement stiffness matrix of the eccentric space thin-walled giroler and space combinad cable element were derived. nonlinear analysis of large deflection used non-move coordinate system, so that the static contribution of elastic stiffness, geometric stiffness and large displacement stiffness can be determined Separately. Nonlinear static equations are solued by modified NewtoN-RapsoN method, Lastly, the numerical examples are given.

摘要： 本文在文献[1]基础上,增加几何非线性分析(二阶理论),导出空间薄壁主梁单元及空间组合索单元的大位移刚度矩阵显式。采用原(不动)坐标系进行大挠度分析,以分别确定弹性刚度、几何刚度、及大位移刚度对静力分析的贡献,并采用牛顿~拉甫生修正迭代法解非线性方程组。文末给出数值算例。