刘小强  刘  杰  梁游钧  李庆元
    （深圳南山建设监理公司  深圳 518052）

[提要]  本文提出了空间桁架结构基于Euler坐标描述的非线性分析方法。几何非线性分析包括考虑结构发生杆端大侧移、杆端大转角下的平衡条件，导出了杆件切线刚度矩阵的显式。材料非线性包括考虑压杆弹塑性失稳前和失稳后的荷载一位移路径。运用本文模型可追踪空间桁架结构外力与位移关系的全过程。
[关键词]  空间桁架 几何非线性 材料非线性

Nonlinear analysis theory of spatial truss structures under Euler coordinate system is presented. Geometrical nonlinearity covers large member end translation and rotation, explicit member tangent
stiffness matrix is derived, thrust dispacement path before and after the maximum load carrying capacity is imbodied. The whole range load displacement corelation can be traced by the analysis model.
Keywords: space trusses; geometrical nonlinearity; material nonlinearity