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中文摘要：
为研究Q460高强钢中厚板焊接箱形压弯构件的整体失稳极限承载力，采用11mrn厚国产Q460高强钢中厚板制作7个焊接箱形压弯试件，试件截面宽厚比分别为18、12、8，长细比分别为35、55、80。试验内容包括：Q460低合金高强钢的材性试验，二利，焊接截面残余应力测试，各试件初始几何缺陷测量及极限承载力试验，从而进行了面内整体失稳压弯构件的极限承载力试验研究；并且把试验结果与我国现行钢结构设计规范计算值相比较。试验研究结果表明：Q460低合金高强钢材性具有高强度，塑性性能良好等特点；Q460高强钢焊接箱形截面残余应力分布形式与普通钢材箱形焊接截面分布基本相同，但是残余应力比降低；压弯构件极限承载力试验结果明显高于现行钢结构规范设计公式计算值，所以应对Q460高强钢焊接箱形压弯构件进行近一步参数分析研究，并得出其实用设计方法。
英文摘要：
This paper presents a study on the ultimate bearing capacity of high strength steel columns in bending and axial compression. Tests on 7 specimens of welded box columns with 3 different cross sections of Q460 high strength steel were conducted. For each type of cross-section, the tests of pin-ended columns with approximate slenderness of 35, 50 and 90, and width-thickness ratio of about 18, 12 and 8, respectively. The tests involve the residual stress of the boxsection, the initial geometric imperfection, the ultimate load of each column, and the ultimate bearing capacity of high strength steel under eccentric load. The measured ultimate loads are compared with the values predicted by design formulas specified in the Chinese codes. The experimental results show that the low alloy Q460 steel has high strength; the simplified residual stress pattern is same as the ordinary steel section, but the ratios of residual stresses are different; the ultimate bearing capacity of welded box columns of high strength steel are higher than the values in the Chinese code for design of steel structures.
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