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受压柱的整体屈曲性能是钢结构研究的重要课题之一,尤其是近几年来应用越来越多的高强钢。对460MPa高强受压构件的整体屈曲性能进行试验研究。对包括焊接箱形截面和I形截面的12根钢柱进行试验。测量构件的残余应力、初弯曲和加载偏心率等初始缺陷。结合试验结果研究其屈曲变形和屈曲承载力。建立有限元模型,并与当前及以往研究中考虑初始缺陷的试验数据进行对比。采用经过验证的模型对大量不同截面尺寸和不同长度的柱的屈曲承载力进行估算,并将计算结果与其他钢结构规范的设计值进行对比。结果表明:460MPa高强钢柱,其无量纲屈曲强度与普通强度钢柱相比明显提高,并给出了相应的柱曲线和设计公式。
The overall buckling performance of the column is one of the important topics in the study of steel structure, especially in the recent years, more and more high strength steel is applied. The whole buckling performance of 460MPa high-strength compression member was tested. Twelve steel columns, including welded box and I sections, were tested. Residual stresses, initial bending and loading eccentricity were measured for initial defects. Combined with the test results, the buckling deformation and buckling capacity were studied. The finite element model was established and compared with the experimental data which considered the initial defects in current and previous studies. The tested models are used to estimate the buckling capacity of a large number of columns with different cross-sectional dimensions and different lengths. The calculated results are compared with the design values of other steel structures. The results show that the 460MPa high strength steel columns have higher non-dimensional buckling strength than ordinary steel columns, and corresponding column curves and design formulas are given.