半刚性连接空间钢框架二阶弹性分析

Practical Second-Order Elastic Analysis for Semi-Rigid Space Frames

基于连续介质力学有限变形理论推导了空间钢框架几何刚度矩阵,采用Kishi Chen幂函数模型描述半刚性连接特性,导得了半刚性连接空间杆单元几何刚度矩阵,并编制了二阶弹性分析程序,对空间钢框架在弹性阶段的性能进行了研究.分析结果表明:半刚性连接的存在使空间钢框架的双向侧移有明显增加,且随着框架层数增加影响增大.因此,在钢框架结构的分析设计中,须考虑半刚性连接的影响.

Based on the finite-deformation theory of continuum mechanics, the stiffness matrix of steel space frame was derived. And by using Kishi-Chen power model to describe the nonlinear behavior of semi-rigid connections, the stiffness matrix for semi-rigid space frame was deducted. Then a program for analyzing the second-order effects of steel space frame has been developed. The case study indicated that semi-rigid connections could augment displacement of frame in two orientations, and such effect increased when increasing the number of the frame floors. So it is necessary to consider the effect of semi-rigid connections in advanced analysis of steel frame.