460MPa高强钢柱整体屈曲性能:试验研究及设计方法

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。

Overall Buckling Behavior of 460MPa High Strength Steel Columns:Experimental Investigation and Design Method

Overall buckling behavior of compression columns is one of the most important research subjects in steel structures,especially for high strength steel which has been increasingly applied in recent years.An experimental inves- tigation was carried out to study the overall buckling behavior of 460MPa high strength steel compression members. Totally twelve columns including welded box and I-sections were comprised.The initial imperfections such as the residual stress,initial bending and loading eccentricity were all measured.Based on experimental results the buckling de- formation and capacity were investigated.A finite element model was established and further validated by comparing with the test data in both present study and other previous researches,in which initial imperfections were taken into account.A large number of columns with various section dimensions and lengths were calculated by using the validated model,and their buckling capacities were compared with design values according to different steel structures specifications.It was found that the nondimensional buckling strength of such 460MPa high strength steel columns were significantly improved compared to normal strength steel columns,and corresponding column curves and design formulae were suggested.