空间钢结构框架连续性倒塌数值模拟

Progressive Collapse Simulation of a Spatial Steel Frame

摘要: 建筑结构在受到非常规作用时的连续性倒塌已经成为严重威胁公共安全的重要问题。为了探究结构抗连续性倒塌性能以及内力重分布的机制，本文采用《建筑抗连续性倒塌设计》(UFC)中推荐的构件去除法对一空间钢结构框架进行抗连续性倒塌数值模拟。使用显式通用有限元软件LS-DYNA进行动力非线性分析，并对数值模拟结果进行了讨论。分析结果表明：按照规范设计的钢框架结构在单根竖向构件失效的情况下具有良好的抗连续性倒塌性能；角柱应被认为是结构倒塌机制中的关键构件。

Abstract: The progressive collapse of building structures subjected to abnormal loadings has been a serious threat to the public safety. To study progressive collapse potential of structure and redistribution mechanism of the internal force, this paper uses the alternate path method recommended by Unified Facilities Criteria to simulate the progressive collapse of a spatial steel frame. Dynamic nonlinear analysis is conducted by explicit finite element software LS-DYNA, and the result of simulation is discussed. The result shows that: the steel frame designed according to the code has good resistance performance to progressive collapse in the case of a single vertical component failure; the corner column should be considered as the key element in the progressive collapse assessment.