爆炸荷载作用下钢筋混凝土框架结构的连续倒塌分析

近年来,鉴于建筑结构连续倒塌分析的复杂性,迄今为止,尚未得出一种可用于工程实际的足够精确的结构连续倒塌分析方法.运用通用有限元显式动力分析软件LS-DYNA,建立了某2跨3层框架结构的三维有限元模型.研究了初始损伤、结构的初始条件等因素对爆炸荷载作用下钢筋混凝土框架结构连续倒塌过程的影响.并将分析结果与传统的结构倒塌分析方法的分析结果进行了对比,进一步提出了一种改进的钢筋混凝土结构连续倒塌分析的方法,对建筑结构抗连续倒塌设计具有一定的指导作用.

Numerical analysis of progressive collapse of reinforced concrete frame under blast loading

Because of the simplification and assumption taken in the numerical analysis, current method in numerical analysis of the structural progressive collapse might not give an accurate and reliable prediction of the process of structural progressive collapse. The three dimensional model of frame structure with twospans and three-story was set up with explicit dynamic analytical software LS-DYNA, and the effects of initial damage and nonzero initial conditions of the structure on the progressive collapse of reinforced concrete frame structure under the impact of blast load were studied, the results of which were compared with the results of traditional method. A new advanced method in the analysis of the progressive collapse of reinforced concrete frame was proposed, which can be used in the design of the progressive collapse resistant reinforced concrete structures.