爆炸荷载作用下建筑结构连续倒塌分析与防连续倒塌设计研究进展

连续倒塌是结构局部某个关键构件的破坏导致相邻构件失效继而引发更多构件破坏,最终导致结构整体倒塌或者产生与初始触因很不相称的大面积倒塌的连锁反应.爆炸荷载作为一种非常规荷载,具有传播迅速、峰值大、作用时间短等特点,是造成建筑结构连续倒塌的主要原因之一.本文在建筑结构连续倒塌已有研究的基础上,提出了结构连续倒塌分析的分类方法;并进一步根据结构连续倒塌分析的目的,将结构连续倒塌分析方法分为结构抗连续倒塌性能评价方法和结构连续倒塌全过程分析方法.通过文献综述,详细介绍了结构抗爆炸连续倒塌性能评价方法和结构抗爆炸连续倒塌全过程分析的最新研究进展;给出了建筑结构防爆炸连续倒塌的概念设计方法和构造措施,提出了建筑结构防爆炸连续倒塌设计的步骤和方法.

Research progress on progressive collapse resistant analysis and design of building structures under blast loading

Progressive collapse is defined as the spread of an initial local failure from a key element to adjacent elements,eventually resulting in the collapse of the whole structure or a disproportionately large part of it.As an abnormal dynamic load,blast load has the characteristic of rapid propagation,high peak value and short duration.And it is also one of the main reasons that might cause the progressive collapse of building structures.Based on the existing research achievements on the progressive collapse of building structures,in this paper the classification method for structural progressive collapse analysis is put forward.Then the current methods for progressive collapse analysis are further divided into two categories,i.e.,the method for evaluation of structural progressive collapse resistance and the method for whole process analysis of structural progressive collapse.Recent progress on the evaluation of structural progressive collapse resistance and the method for whole process analysis of structural progressive collapse are presented from literatures.Finally,the conceptual design method,structural detailing and the procedure for progressive collapse resistant design of building structures against blast loading are put forward.