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Progressive collapse analysis of composite steel frames subject to fire following earthquake

机译：地震后火灾下复合钢框架的逐步倒塌分析

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This paper presents three-dimensional progressive collapse analyses of composite steel frames exposed to fire following earthquake. The scenarios of heating columns located in various different fire compartments (internal, edge and corner bay) are first studied to investigate load redistribution paths and members' interactions within the composite frame. The results show that the loads previously supported by the heated columns are redistributed to adjacent columns along two horizontal directions, a phenomenon which cannot be captured in a 2D model. Then, the 3D model is adopted to investigate the effect of residual deformation after an earthquake on the progressive collapse behaviour of the composite building. It is found that neither the load redistribution path nor the fore resistance of the building is considerably affected by the residual deformation. A series of progressive collapse analyses subjected to travelling fires resulting from fire compartment damage is also performed. It is concluded that the survival of the building can be greatly affected by the spatial nature of the travelling fire as well as the inter-zone time delay.
机译：本文介绍了地震后遭受火灾的复合钢框架的三维渐进倒塌分析。首先研究位于各种不同的防火舱（内部，边缘和角舱）中的加热柱的场景，以研究复合框架内的载荷重新分布路径和构件之间的相互作用。结果表明，先前由加热柱支撑的载荷沿两个水平方向重新分配给相邻柱，这种现象在2D模型中无法捕获。然后，采用3D模型研究地震后残余变形对复合建筑渐进倒塌行为的影响。可以发现，残余变形不会显着影响建筑物的负荷再分配路径或前阻力。还进行了一系列渐进倒塌分析，这些火灾分析是由于火灾造成的火灾而损坏的。得出的结论是，建筑物的生存能力会受到行进火势的空间特性以及区域间时间延迟的极大影响。

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