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该文对焊接高强钢管稳定性进行了试验研究及数值分析。首先对Q690钢材进行了材性试验,其次对不同长细比的18根Q690焊接钢管轴心受压构件进行了整体稳定性试验,采用割环法测量了焊接钢管残余应力的分布。在试验研究的基础上,采用逆算单元长度法编制了考虑初始缺陷的高强钢管轴心受压构件稳定性分析程序,分析了6种不同长细比高强钢管的稳定性承载力。在试验研究和数值分析的基础上提出了高强钢轴心受压构件稳定系数计算公式,给出高强钢轴心受压构件的稳定系数表。数值与试验结果及规范的对比分析表明,该文得到的高强钢管稳定系数-长细比曲线分布合理,可用于高强钢轴心受压构件的稳定设计。
In this paper, the experimental study and numerical analysis of the stability of welded high strength steel pipe are carried out. Firstly, the material test of Q690 steel was carried out. Secondly, the overall stability of 18 Q690 welded steel pipe axial compression members with different slenderness ratio was tested. The residual stress distribution of the welded steel pipe was measured by the ring-cut method. Based on the experimental study, the stability analysis program of the high-strength steel tube axial compression member considering the initial defect was developed by using the inverse element length method. The stability bearing capacity of six kinds of high-strength steel tubes with different slenderness ratios was analyzed. On the basis of experimental research and numerical analysis, the formula for calculating the stability coefficient of high strength steel axial compression member is proposed, and the stability coefficient table of high strength steel axial compression member is given. The comparison between the numerical results and the test results shows that the stability coefficient of the high strength steel pipe - slenderness curve is reasonable and can be used for the stability design of high strength steel axial compression members.