Nonlinear analysis of temperature field of steel-concrete composite beams subjected to natural fire

Journal of Applied Fire Science Pub Date : 2013-01-01 DOI:10.2190/AF.23.4.A

Fang Tingyong, Xintao Zheng, Biteng Cao, Han Tingting

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Abstract

Numerous studies have been carried out on the temperature field of steel-concrete composite beams exposed to natural fire. The temperature variation process of indoor air, including heating and cooling phase subjected to natural fire, is simulated by using the fire dynamics software FDS, and the elevated temperature curve of air on the fire source is calculated, which is different from ISO834 standard fire curve. According to the curve, the thermal field of composite beams is analyzed by finite element analysis software ANSYS and the thermal field distribution of composite beams is obtained. The web temperature reaches 718.4°C, which is highest in the cross-section. Also, the influence of the thickness of protection layer on the thermal field under natural fire is investigated. The calculated results show that fire-retardant coating has a significant effect on the thermal field and can effectively improve the fireproof time in fire. The climbing rate of the internal temperature in the composite beams will reduce gradually and the peak temperature will decrease obviously with the increment of the coating thickness.

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自然火灾作用下钢-混凝土组合梁温度场的非线性分析

对钢-混凝土组合梁在自然火灾作用下的温度场进行了大量的研究。利用火灾动力学软件FDS模拟了自然火灾作用下室内空气的温度变化过程，包括加热和冷却阶段，并计算出与ISO834标准火灾曲线不同的火源上空气的升温曲线。根据该曲线，利用有限元分析软件ANSYS对组合梁的热场进行了分析，得到了组合梁的热场分布。腹板温度达到718.4℃，截面最高。研究了保护层厚度对自然火灾下热场的影响。计算结果表明，防火涂料对热场有显著的影响，可以有效地提高火灾中的防火时间。随着涂层厚度的增加，复合梁内部温度的爬升速率逐渐减小，峰值温度明显降低。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Journal of Applied Fire Science

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