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Advanced analyses of the membrane action of composite slabs under natural fire scenarios A case study of the JTI headquarters

机译：自然火灾下复合板的膜作用的高级分析-以日本国际石油公司总部为例

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Purpose - This paper aims to detail the advanced natural fire simulations that were carried out for the composite steel-reinforced concrete structure of the JTI Building in Geneva, Switzerland. The results of these analyses led to a significant reduction of in the fireproofing of the steel floor framing. Design/methodology/approach - Several scenarios were studied considering different thermal behaviours of the peripheral cladding. Despite the small thickness of the resisting slabs, the analyses performed with SAFIR software showed that the typical wide storey bay (12 x 15.86 m) can resist to the design's fire temperatures without the protection of the main and secondary beams while the spandrels remain protected. For study completeness, the composite frame-membrane model was also simulated with Hasemi-localized fire routines on SAFIR. Findings - The analyses have showed that the membrane behaviour of composite slabs under fire allows a significant reduction of the fire protection, even in case of small thickness of the concrete topping. The increase of the reinforcement ratio to sustain the membrane forces is widely compensated by the savings related to the fireproofing of the steel framing. Practical/implications - A natural fire approach is particularly advisable in case of fully glazed buildings. In fact when the facade collapses, the entry of a large cold air quantity limits the increase of the gas temperature inside the compartment. Originality/value - The analyses were carried out with recent SAFIR routines for localized fires (Hasemi fire model) and represent one of the first applications in practice. The issue of the rebar orientation in mesh is raised out. The latest SAFER release allows the definition of a global orientation of the rebars and amends the issue.
机译：目的-本文旨在详细介绍对瑞士日内瓦JTI大楼的钢筋混凝土结构进行的高级自然火灾模拟。这些分析的结果大大降低了钢地板框架的防火性。设计/方法/方法-考虑到外围包层的不同热行为，研究了几种方案。尽管阻力板的厚度很小，但使用SAFIR软件进行的分析表明，典型的宽层隔间（12 x 15.86 m）可以抵抗设计的火灾温度，而无需保护主梁和副梁，而翼the仍然受到保护。为了研究的完整性，还使用在SAFIR上进行了Hasemi局部点火程序模拟了复合框架膜模型。研究结果-分析表明，即使在混凝土浇筑料的厚度较小的情况下，复合板在火灾下的膜行为也可以显着降低其防火性能。维持膜力的增强比的增加被与钢框架防火相关的节省所广泛补偿。实用/含义-对于全玻璃建筑物，特别建议采用自然防火方法。实际上，当立面倒塌时，大量冷空气的进入限制了车厢内气体温度的升高。原创性/价值-分析是使用最新的SAFIR例行程序进行的局部火灾（Hasemi火灾模型）进行的分析，代表了实践中的首批应用之一。提出了钢筋在网格中的定向问题。最新的SAFER版本允许定义钢筋的整体方向并修正此问题。

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