【摘要】 因结构局部破坏后荷载沿不同方向传递引起内力重分布,空间结构分析在连续倒塌研究中具有重要意义。该文为研究框架结构抵抗连续倒塌的特点,使用线性静力方法分析了空间钢框架撤柱后的受力性能,与单榀框架撤柱分析进行了比较,并研究了不同平面布置形式对最大需求能力比DCR(demand for the capacity ratio)的影响。研究结果表明,比较单榀框架和空间框架分析,最大DCR出现在空间分析中,结构整体布置形式与长跨、短跨布置形式共同影响结构最大DCR所在位置。更多还原

【Abstract】 The spacial analysis of structures has great significance in the research on progressive collapse because the load transfers along different directions and results in the redistribution of internal force after local failures in structures.To investigate the characteristics of progressive collapse resistance of frames,the paper analyzed the mechanical behaviors of space steel frames with specific removed columns and compared the spacial analysis with the analysis of a single frame with removed columns.The influence of different plane layout forms on the maximum demand for the capacity ratio was also studied.It was shown that the maximum demand for the capacity ratio appeared in the spacial analysis comparing the analysis of the single frame with the spacial analysis,and that the location of the maximum demand for the capacity ratio was jointly affected by layout forms of the structure and the span in the results.更多还原