Experimental behaviour of composite slabs during the heating and cooling fire stages
Experimental behaviour of composite slabs during the heating and cooling fire stages
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DOI：
10.1016/j.engstruct.2010.11.014
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发表时间：
2011-02-01
影响因子：
5.5
通讯作者：
Bailey, C. G.
中科院分区：
文献类型：
--
作者：
Guo, S.;Bailey, C. G.
大多数调查火灾对结构影响的理论和实验研究以前只集中在火灾加热阶段的结构行为上，部分原因是国际公认的标准火灾测试只考虑火灾的这一阶段。来自真实建筑物的真实火灾的证据表明，火灾的冷却阶段同样重要，即使建筑物在加热阶段幸存到最高火灾温度，也有可能在火灾的这一阶段发生故障。本文提供了一个深入了解复合板在不同的火灾情况下的行为，同时考虑到火灾的加热和冷却阶段。大量的测试数据显示了甲板和钢网的力矩和应变的重新分布，以及在整个火灾期间的位移。结果表明，复合板坯的性能与升温速率、最高温度和冷却速率有关。就整体性能而言，板的非着火侧的位移和温度是重要的。在本文中提出的试验表明，一种火灾情景导致最大位移，而另一种火灾情景导致未暴露面的最高温度。此外，在火灾冷却阶段，板的未暴露侧和板内的网格加固的最高温度。这突出了一个事实，即在设计时必须在一系列可能的火灾情况下检查结构的性能，其中必须包括火灾的加热和冷却阶段。(C) 2010 Elsevier Ltd.版权所有。
Most theoretical and experimental research investigating the effect of fire on structures has previously concentrated only on the structural behaviour during the heating stages of the fire, partly due to the fact that internationally accepted standard fire tests only consider this stage of the fire. Evidence from real fires in real buildings has highlighted that the cooling phase of a fire is equally important and it is possible for structures to fail during this stage of the fire even though they have survived the heating stage up to a maximum fire temperature. This paper provides an insight into the behaviour of composite slabs under different fire scenarios considering both the heating and cooling phase of the fire. Extensive test data is presented which shows the redistribution of moments and strains in the deck and steel mesh, together with displacements during the full duration of the fire. The results show that the behaviour of composite slabs is dependent on the heating rate, the maximum temperature reached and the cooling rate. In terms of overall performance, displacements and the temperature on the non-fire side of the slab are important. For the tests presented in this paper it was shown that one fire scenario resulted in the maximum displacement but another fire scenario resulted in the maximum temperature on the unexposed face. In addition the maximum temperature of the unexposed side of the slab and the mesh reinforcement within the slab occurring during the cooling stages of the fire. This highlights the fact that the performance of structures must be checked in design under a range of possible fire scenarios, which must include both the heating and cooling stages of a fire. (C) 2010 Elsevier Ltd. All rights reserved.