Nonlinear analysis of concrete-filled thin-walled steel box columns with local buckling effects
Nonlinear analysis of concrete-filled thin-walled steel box columns with local buckling effects
复制标题
DOI：
10.1016/j.jcsr.2005.09.007
复制
发表时间：
2006-06-01
影响因子：
4.1
通讯作者：
Liew, JYR
中科院分区：
文献类型：
--
作者：
Liang, QQ;Uy, B;Liew, JYR
钢板的局部屈曲降低了薄壁钢箱混凝土轴压柱的极限承载力。目前的分析方法没有考虑局部屈曲的影响，导致对组合柱和框架极限承载力的估计过高。本文提出了一种考虑局部屈曲效应的薄壁钢箱形钢管混凝土短柱极限承载力和受力性能的非线性纤维单元分析方法。纤维单元法考虑约束混凝土和结构钢的非线性本构模型。在纤维单元分析程序中加入了考虑局部屈曲影响的钢板有效宽度公式。通过逐渐重新分配钢板内的正应力来模拟渐进局部屈曲和后局部屈曲。提出了两个评价钢管混凝土柱截面性能和延性性能的性能指标。利用该计算方法研究了宽厚比和混凝土抗压强度对钢管混凝土柱极限承载力和延性的影响。结果表明，非线性纤维单元法的发展预测的极限荷载和性能的薄壁钢箱形混凝土柱，并可以在先进的分析程序中实施的组合框架的非线性分析。(c)2005爱思唯尔有限公司保留所有权利。
Local buckling of steel plates reduces the ultimate loads of concrete-filled thin-walled steel box columns under axial compression. The effects of local buckling have not been considered in advanced analysis methods that lead to the overestimates of the ultimate loads of composite columns and frames. This paper presents a nonlinear fiber element analysis method for predicting the ultimate strengths and behavior of short concrete-filled thin-walled steel box columns with local buckling effects. The fiber element method considers nonlinear constitutive models for confined concrete and structural steel. Effective width formulas for steel plates with geometric imperfections and residual stresses are incorporated in the fiber element analysis program to account for local buckling effects. The progressive local and post-local buckling is simulated by gradually redistributing the normal stresses within the steel plates. Two performance indices are proposed for evaluating the section and ductility performance of concrete-filled steel box columns. The computational technique developed is used to investigate the effects of the width-to-thickness ratios and concrete compressive strengths on the ultimate strength and ductility of concrete-filled steel box columns. It is demonstrated that the nonlinear fiber element method developed predicts well the ultimate loads and behavior of concrete-filled thin-walled steel box columns and can be implemented in advanced analysis programs for the nonlinear analysis of composite frames. (c) 2005 Elsevier Ltd. All rights reserved.