空间杆系结构的有限元非线性分析

推导建立一种用于空间杆系结构非线性计算的多结点空间等参杆单元。这一单元动用了有限位移的增量理论，引入了等参元的概念，结合材料的非线性模型可有效地解决空间杆系数结构的非线性分析计算问题，能更好地处理空间曲杆，在处理非线性计算时采用了以单元内积分点的非线性状态综合描述单元非线必状态的方法。

The Nonlinear Analysis of Finit Element for Space Frames

This paper developed a multiple noded isoparametric element for the nonlineer analysis of space frames. Finit displacement theory and isoparametric concept are applied. This element used also the mathematical models of the material nonlinearity and is able to deal with the nonlinear analysis of space frames effectively. When the nonlinear analysis is carried out, the nonlinear conditions of the isoparametric element are put into effect with the help of the nonlinear conditions of the Gauss integration points in the isoparametric element. The comparing with the other nonlinear analysis proves that the multiple noded isoparametric element for space frames is reasonable and effective.