Numerical analysis of slender elliptical concrete filled columns under axial compression
Numerical analysis of slender elliptical concrete filled columns under axial compression
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DOI：
10.1016/j.tws.2013.11.015
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发表时间：
2014-04-01
影响因子：
6.4
通讯作者：
Ye, J.
中科院分区：
文献类型：
--
作者：
Dai, X. H.;Lam, D.;Ye, J.
本文提出了一种非线性有限元模型 (FEM)，用于预测具有椭圆空心截面的细长钢管混凝土 (CFST) 柱在轴向压缩下的行为。通过将数值预测与 18 个椭圆形钢管混凝土柱的实验观察进行比较，验证了有限元法的准确性，这些椭圆形钢管混凝土柱经过精心选择，以代表典型的截面尺寸和构件的细长度。讨论了将欧洲规范 4 中提供的圆形和矩形钢管混凝土柱现行设计规则应用于椭圆形钢管混凝土柱的适应性。为了覆盖更广泛的构件截面和细长度，对不同截面尺寸、长度和混凝土强度进行了参数化研究，目前实践中采用该参数化研究来检验重要的结构性能和设计参数，如柱缺陷、无尺寸细长度和屈曲折减系数等。得出的结论是，可以采用欧洲规范4中圆形和矩形钢管混凝土柱的设计规则来计算 尽管使用欧洲规范 4 中规定的长度/300 的缺陷，但对于具有较低无量纲细长度的椭圆形钢管混凝土柱来说，椭圆形钢管混凝土柱的轴向屈曲载荷可能过于保守。 (C) 2013 Elsevier Ltd. 保留所有权利。
This paper presents a non-linear finite element model (FEM) used to predict the behaviour of slender concrete filled steel tubular (CFST) columns with elliptical hollow sections subjected to axial compression. The accuracy of the FEM was validated by comparing the numerical prediction against experimental observation of eighteen elliptical CFST columns which carefully chosen to represent typical sectional sizes and member slenderness. The adaptability to apply the current design rules provided in Eurocode 4 for circular and rectangular CFST columns to elliptical CFST columns were discussed. A parametric study is carried out with various section sizes, lengths and concrete strength in order to cover a wider range of member cross-sections and slenderness which is currently used in practices to examine the important structural behaviour and design parameters, such as column imperfection, non-dimension slenderness and buckling reduction factor, etc. It is concluded that the design rules given in Eurocode 4 for circular and rectangular CFST columns may be adopted to calculate the axial buckling load of elliptical CFST columns although using the imperfection of length/300 specified in the Eurocode 4 might be overconservative for elliptical CFST columns with lower non-dimensional slenderness. (C) 2013 Elsevier Ltd. All rights reserved.