中文摘要：

为研究高强度钢材轴心受压构件的整体稳定受力性能,了解构件的几何初始缺陷和截面残余应力对其屈曲强度和失稳变形的影响,以及与普通强度钢材轴压杆相比高强度钢材柱的整体稳定性能对缺陷敏感性的变化,采用有限元方法进行数值模拟计算,通过变换几何初始缺陷系数、残余应力数值大小和钢材强度等参数,对计算结果进行对比分析。研究结果表明,随着钢材强度的提高,高强度钢材轴压杆的整体屈曲强度对初始缺陷的敏感性明显降低,特别是对残余应力分布的敏感性;此外,初始缺陷的影响还与构件的长细比有直接关系。研究工作进一步揭示了高强度钢材轴压柱整体稳定性能的特点和优势。

英文摘要：

The overall buckling behavior of high strength steel columns with nominal yield strength more than 460 MPa was improved a lot compared with the ordinary strength steel columns.The effect of the initial geometrical imperfection and the residual stress on the buckling strength of high strength steel columns was analyzed by using finite element analysis（FEA）method,as well as the change of sensitivity to the initial imperfection.Based on the parameter analysis,including the initial imperfection and the steel strength,it showed that with the increase of the steel strength,the degree of the sensitivity to initial imperfections became lower,especially for the residual stress.Besides,the effect of the imperfection significantly correlated with the slenderness ratio of columns.Finally,the characteristics and advantages of the overall buckling behavior of high strength steel columns were revealed.