大跨度钢桁架极限承载力的双重非线性分析

Dual Nonlinear Analysis of Ultimate Load-Bearing Capacity of Long-span Steel Truss

通过考虑几何非线性及材料非线性,并对结构施加初始竖向几何位移缺陷,采用逐步加载的方法,对某体育馆的大跨度立体钢桁架进行极限承载力分析,得到了该桁架的极限承载力及荷载-位移全过程曲线。分析结果表明,进行弹塑性分析能得到接近实际的结构承载能力,可供设计人员参考。

Based on allowing for geometric nonlinear, material nonlinear and initial geometric imperfection, the ultimate bearing capacity of the long-span steel truss in a certain gymnasium is analyzed by loading step by step, the ultimate bearing capacity and the curves of load-displacement are obtained. The results demonstrate that the real bearing capacity of this truss can be obtained by the elastic-plastic analysis.