高强钢焊接箱形柱轴心受压极限承载力试验研究

为了研究高强钢中厚板焊接箱形柱的极限承载力，以11mm厚国产Q460高强钢中厚板制作了7个焊接箱形柱进行轴心受压试验。试件共包含宽厚比8、12、18三种截面，长细比分别为35、50、70。根据试件的实测尺寸、钢材的力学性能建立有限元模型，以初始缺陷的形式考虑了试件的初始挠度、初始偏心及焊接残余应力，分析预测了试件的极限承载力。试验结果表明，高强钢焊接箱形柱稳定系数采用GB 50017-2003《钢结构设计规范》中的c类截面柱子曲线偏保守，试验结果平均曲线更接近b类截面曲线，但仍需进一步验证。分析结果表明，考虑了初始缺陷的有限元模型可准确预测柱的极限承载力，可以作为试验数据的补充。

Experimental study on ultimate bearing capacity of axially compressed high strength steel columns

An experimental and theoretical study was presented on ultimate bearing capacity of axially compressed high strength steel columns.The experimental program included 7 welded box columns of 3 different cross sections which were welded with 11 mm-thick Q460 high strength steel plates made in China.The FEA models were built up according to measured sizes of members and tension coupon test results.And initial geometric imperfections and residual stress were taken into account in the FEA models.The experimental result shows that the stability coefficients of welded box columns of high strength steel are higher than the values of type c column curve in GB 50017—2003,and even higher than the values of type b curve for most of the specimens.However,due to the limited test result,the adoption of type b curve needs further verification.The FEA result agrees well with experimental result and could be a valid supplement of test data.