Stability analysis of large‐span steel truss structure under local cooling from fire extinguishing system |
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| Authors: | Guowei Zhang Guoqing Zhu Guanglin Yuan Qing Li |
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| Affiliation: | 1. School of safety engineering, China University of Mining and Technology, Xuzhou, China;2. Key Laboratory of Coal Methane and Fire Control (China University of Mining and Technology), Ministry of Education, Xuzhou, China;3. School of mechanics and civil engineering, China University of Mining and Technology, Xuzhou, China |
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| Abstract: | In case of a fire in large‐span steel structure buildings, the firefighters usually use water to cool the steelwork. However, during the cooling by the spraying water, the collapse of these structures is unclear. In this paper, a large‐span center is taken as an example to study the overall mechanical response process under local cooling conditions in fire. The Fire Dynamics Simulator has been used to investigate the temperature field distribution rule of large‐span buildings under fire. Using the coupled thermal‐mechanical method to study the overall mechanical response process of steel structure under local abrupt drop in temperature, displacement and stress variations of the large‐span steel structure under local cooling have been analyzed. Results of this study show that the temperature distribution in large‐span structures is nonuniform in fire. Using spraying water to cool the structural members in fire can cause the structural stress field redistributed that may lead to further damage to the structure. |
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| Keywords: | fire large‐span structures local cooling stability analysis steel structure structural safety |
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