大跨空间网格结构连续性倒塌研究及实例分析

The Progressive Collapse Research and Example Analysis of Long-span Space Grid Structures

大跨空间网格结构的连续倒塌分析可采用变换荷载路径法,首先对结构进行重要构件的判断,主要包括概念判断和敏感性分析。采用ANSYS的APDL语言编写了大跨空间结构的简化敏感性分析程序。结合某网球馆钢结构工程,对该结构角柱失效模式进行了连续倒塌分析。分析结果表明角柱失效的影响区域有限,除部分腹杆达到屈服状态以外,相邻的主要构件无论是变形还是应力均没有受到大的影响,故角柱失效结构不会发生连续性倒塌。

The progressive collapse analysis of long-span space grid structures can use alternate path method.The important component of the whole structure should be firstly estimated,which includes conceptual estimate and sensitivity analysis.The APDL language of the ANSYS software was used to write a program of sensitivity analysis.Combining with the tennis gymnasium steel engineering,the progressive collapse of corner column invalidation mode was analyzed.The results show that the affective area by corner column invalidation was limited,except some web member yielding,the displacement and stress of the members around were little affected.So the corner column invalidation mode wouldn't bring on progressive collapse of the steel structure.