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Quantitative evaluation of progressive collapse process of steel portal frames in fire

机译：火灾中钢门架逐步倒塌过程的定量评估

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This paper presents quantitative investigations on the collapse behavior of steel portal frames exposed to standard fires. The complete collapse process is divided into safe, alert, dangerous and collapse stages. These four stages are to warn firefighters to make timely reactions to stay, ready to evacuate, and must evacuate, respectively. Numerical models are established and validated against fire tests on a full-scale steel portal frame. Based on the key displacements of the heated columns and rafters, the four stages are quantitatively determined in terms of visible phenomena and warning times. It is found that one should be ready to evacuate when the heated rafter shows large deflections, and must evacuate when the heated column moves back to its initial position. The 1 h, 2 h, 3 h fire rating of protected steel portal frames can be used to estimate the ready-evacuate, must evacuate and collapse warning time, respectively. The findings from this preliminary study aim to provide references for firefighters to make wise decisions to evacuate timely and safety from the fire scene. (C) 2018 Elsevier Ltd. All rights reserved.
机译：本文对暴露于标准火灾下的钢门框架的倒塌行为进行了定量研究。完整的崩溃过程分为安全，警报，危险和崩溃阶段。这四个阶段分别警告消防员做出及时的反应以留下，准备撤离和必须撤离。建立了数字模型，并针对全尺寸钢门架进行了耐火测试，并对其进行了验证。根据加热的柱子和r子的关键位移，根据可见现象和警告时间定量确定四个阶段。已经发现，当加热的r子显示出较大的挠度时，应该准备撤离，而当加热的柱子移回到其初始位置时，必须撤离。受保护的钢门式门架的1 h，2 h，3 h防火等级可分别用于估计准备疏散，必须疏散和倒塌的警告时间。这项初步研究的结果旨在为消防员做出明智的决定提供参考，以使其能够及时，安全地从火灾现场撤离。 （C）2018 Elsevier Ltd.保留所有权利。

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