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Local buckling of steel plates in concrete-filled steel tubular columns at elevated temperatures

机译：高温下钢管混凝土柱中钢板的局部屈曲

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摘要

Local buckling remarkably reduces the strength of steel plates in rectangular thin-walled concrete-filled steel tubular (CFST) columns at ambient temperature. This effect is more remarkable at elevated temperature. However, there have been very limited experimental and numerical investigations on the local and post-local buckling behavior of steel plates in CFST columns at elevated temperatures. This paper presents numerical studies on the local and post-local buckling behavior of thin steel plates under stress gradients in rectangular CFST columns at elevated temperatures. For this purpose, finite element models are developed, accounting for geometric and material nonlinearities at elevated temperatures. The initial geometric imperfections and residual stresses presented in steel plates are considered. Based on the finite element results, new formulas are proposed for determining the initial local buckling stress and post-local buckling strength of clamped steel plates under in plane stress gradients at elevated temperatures. Moreover, new effective width formulas are developed for clamped steel plates at elevated temperatures. The proposed formulas are compared with existing ones with a good agreement. The effective width formulas developed are used in the calculations of the ultimate axial loads of rectangular CFST short columns exposed to fire and the results obtained are compared well with the finite element solutions provided by other researchers. The initial local buckling and effective width formulas can be implemented in numerical techniques to account for local buckling effects on the responses of rectangular thin walled CFST columns at elevated temperatures.
机译：在室温下，局部屈曲会显着降低矩形薄壁钢管混凝土（CFST）柱中钢板的强度。在高温下，这种效果更加明显。但是，关于CFST柱中钢板在高温下的局部和局部屈曲行为的实验和数值研究非常有限。本文介绍了在高温下矩形CFST柱中应力梯度下薄钢板的局部和局部屈曲行为的数值研究。为此，开发了有限元模型，考虑了高温下的几何和材料非线性。考虑了钢板中出现的初始几何缺陷和残余应力。基于有限元结果，提出了新的公式，用于确定在高温下平面应力梯度下夹紧钢板的初始局部屈曲应力和局部屈曲后强度。此外，针对在高温下的夹板开发了新的有效宽度公式。拟议的公式与现有公式进行了比较，吻合得很好。所开发的有效宽度公式用于计算矩形CFST短柱承受火的极限轴向载荷，并将所得结果与其他研究人员提供的有限元解决方案进行了比较。初始局部屈曲和有效宽度公式可以用数值技术实现，以解决局部屈曲对矩形薄壁CFST柱在高温下的响应的影响。

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