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采用非线性有限元模型(FEM)研究轴压下细长椭圆钢管混凝土柱(CFST)的性能。将代表构件典型截面尺寸和长细比的18根椭圆钢管混凝土柱的试验结果与有限元分析结果进行对比,验证了有限元方法的准确性。对现行欧洲规范4中圆形和矩形钢管混凝土柱的设计准则是否适合推广到椭圆钢管混凝土柱进行了讨论。为涵盖目前用于描述重要结构性能和设计参数的不同截面尺寸和长细比,如柱缺陷、长细比和屈曲折减系数等,对各种截面尺寸、长度和混凝土强度进行了参数研究。尽管使用欧洲规范4中缺陷为l/300的规定对长细比较小的椭圆钢管混凝土柱过于保守,欧洲规范4给出的圆形和矩形钢管混凝土柱的设计准则仍可用于计算椭圆形钢管混凝土柱的轴向屈曲。
The nonlinear finite element model (FEM) was used to study the performance of CFST under axial compression. The experimental results of 18 elliptical CFST columns, which represent the typical section size and slenderness ratio of members, are compared with the results of finite element analysis to verify the accuracy of the finite element method. A discussion of the applicability of the design criteria for circular and rectangular CFST columns to the existing European Specification 4 to elliptical CFST columns is discussed. The parameters of various cross-sectional dimensions, lengths and concrete strengths were studied in order to cover the different cross-sectional dimensions and slenderness ratios currently used to characterize important structural properties and design parameters such as column defects, slenderness ratio and buckling reduction factor. The design criteria for circular and rectangular CFST columns given in Eurocode 4 can still be used to calculate elliptical CFST columns, even though the oval CFST columns with smaller slenderness are too conservative using the European standard 4 for defects of l / 300 Axial buckling of the column.