The influence of travelling fires on a concrete frame

The influence of travelling fires on a concrete frame
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行火对混凝土框架的影响

DOI:
10.1016/j.engstruct.2011.01.034
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发表时间:
2011
影响因子:
5.5
通讯作者:
Law A
Law A
中科院分区:
工程技术2区
文献类型:
--
作者:
Law A

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当建筑火灾发生在大的敞开的隔间时,它们很少在结构的整个楼板上均匀燃烧。取而代之的是,他们倾向于旅行,点燃途中的燃料,并在转向下一个燃料包时将其燃烧殆尽。目前的结构火灾设计方法没有考虑这些类型的火灾。本文应用了一种新的方法来定义一族可能的加热制度的框架混凝土结构的概念使用行进火灾。用一个普通混凝土结构的有限元模型研究了火灾家族相互之间的影响,并与传统的编码温度-时间曲线进行了比较。研究发现,火灾对结构的性能有很大的影响,目前的设计方法不能假定是保守的。此外,研究还发现,当火灾面积约为楼板面积的25%时,结构反应最严重。结果表明,该方法简单易行,能提供更逼真的火灾场景,比现有的设计方法更为保守。
When building fires occur in large, open compartments they rarely burn uniformly across an entire floor plate of a structure. Instead, they tend to travel, igniting fuel in their path and burning it out as they move to the next fuel package. Current structural fire design methods do not account for these types of fires. This paper applies a novel methodology for defining a family of possible heating regimes to a framed concrete structure using the concept of travelling fires. A finite-element model of a generic concrete structure is used to study the impact of the family of fires; both relative to one another and in comparison to the conventional codified temperature–time curves. It is found that travelling fires have a significant impact on the performance of the structure and that the current design approaches cannot be assumed to be conservative. Further, it is found that a travelling fire of approximately 25% of the floor plate in size is the most severe in terms of structural response. It is concluded that the new approach is simple to implement, provides more realistic fire scenarios, and is more conservative than current design methods.
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