结构连续倒塌分析改变路径法研究

为采用改变路径法进行结构连续倒塌分析，研究了该方法所涉及的3个关键问题；建立了采用改变路径法进行结构连续倒塌分析的流程；通过对一个多层平面钢框架连续倒塌分析，对改变路径法采用的线弹性静力分析、非线性静力分析和非线性动力分析方法进行了比较。结果表明：结构初始失效后，由于内力重分布，可能会进一步导致结构损伤；相对于动力分析方法，静力分析方法比较简单，但可能会导致较为保守的结果；静力线弹性分析的结果比静力非线性分析的结果更为保守。

Study on alternate path method of structural progressive collapse analysis

In order to carry progressive collapse analysis of structures by alternate path(AP) method three key problems were studied and flowcharts for performing AP method were set up.By progressive collapse of a multi-story steel plane frame linear elastic static procedure,nonlinear static procedure and nonlinear dynamic procedure of the AP method were compared.The analysis results show: the structure will be damaged further probably because of the redistribution of internal forces after the initial failure;althoug...