Abstract In buildings where columns are not continuous along their height loads are often transferred via transfer beams. As a result, these beams can be subjected to larger shear forces and bending moments in comparison to conventional beams. Transfer beams are typical in modern construction, especially for high-rise buildings; commonly arising to achieve architectural features. Nonetheless, the research on their behaviour in fire is limited. In this paper, a case study of a building modelled with deep and shallow transfer beams is examined with the finite element analysis software LS-DYNA. Two sub models are investigated: a three storey model; and a seven storey model, which includes the upper structure of the building. For the three storey sub-model, a potential collapse mechanism is presented that is associated with the deep transfer beams. The results show that the increasing beam deflections in a fire event can lead to inwards pull-in of columns and deflection of non-fire affected storeys under both single-storey fires and multi-storey fires. The inclusion of the upper structure in the analysis through the seven storey sub-model has shown that adequate load redistribution between the columns, bracing and beams on the upper storeys of the structure can assist in preventing the mechanism from occurring although a trend for runaway failure is still observed. Shallow beams were found to be vulnerable only when subjected to multi-storey fires. The single element idealization that is adopted in design guidance would not be able to necessarily capture these collapse mechanisms. Therefore, care should be taken by designers when assessing the expected fire performance of structures with transfer beams that support a large number of stories or have the potential to be exposed to multi-storey fires.

中文翻译：

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传递梁在高层钢结构建筑整体结构火灾响应中的作用

摘要 在柱子沿其高度不连续的建筑物中，荷载通常通过传递梁传递。因此，与传统梁相比，这些梁可以承受更大的剪切力和弯矩。转移梁在现代建筑中是典型的，尤其是高层建筑；通常出现以实现建筑特征。尽管如此，关于它们在火灾中的行为的研究是有限的。在本文中，使用有限元分析软件 LS-DYNA 对用深浅过渡梁建模的建筑物进行了案例研究。研究了两个子模型：一个三层模型；和一个七层的模型，其中包括建筑物的上部结构。对于三层子模型，提出了与深转移梁相关的潜在坍塌机制。结果表明，在单层火灾和多层火灾下，火灾事件中梁挠度的增加会导致柱子向内拉入和非火灾影响楼层的挠度。通过七层子模型在分析中包含上部结构表明，在结构上层的柱、支撑和梁之间适当的载荷重新分配可以帮助防止机制发生，尽管存在失控故障的趋势仍在观察中。发现浅梁只有在遭受多层火灾时才容易受到攻击。设计指南中采用的单一元素理想化不一定能够捕捉到这些坍塌机制。所以，