Buckling Resistance of Axially Restrained Chord Members of Grid Structure at Elevated Temperatures

D. Yong, J. Liew, M. Xiong, J. Zou, Zeng Bo
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Abstract

This paper investigates the behavior of large span grid structure exposed to a localized fire. The localized fire may generate hot smoke and thus induce non-uniform temperature distribution in the grid structure. The thermal expansion of the heated members tend to be axially restrained by the adjacent cold members thus inducing additional forces on the critical members of the grid structure. The buckling resistance of axially restrained member at elevated temperature may be obtained based on second order analysis of member with initial lateral imperfection by considering force equilibrium at deformed geometry and cross section resistance being reached. The critical temperature of the member is reached when the axial force reaches its buckling resistance. It is found that the critical temperature of members with initial lateral imperfection was higher than that without such imperfection for chord members with large slenderness ratio and high axial restraint.
高温下网格结构轴向约束弦杆的屈曲抗力
研究了大跨度网架结构在局部火灾作用下的受力性能。局部火灾会产生热烟,导致网格结构温度分布不均匀。受热构件的热膨胀倾向于受到相邻冷构件的轴向约束,从而在网格结构的关键构件上产生附加力。考虑变形几何处的力平衡和达到截面阻力,对具有初始侧向缺陷的构件进行二阶分析,得到轴向约束构件在高温下的屈曲抗力。当轴向力达到其抗屈曲能力时,构件达到临界温度。研究发现,对于长细比大、轴向约束高的弦杆,初始侧向缺陷的临界温度高于未初始侧向缺陷的临界温度。
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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