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对63根屈服强度550MPa高强冷弯薄壁型钢卷边槽形截面轴压构件进行试验研究,分析了构件的屈曲模式和极限承载力,并将参考AISI规范、澳洲规范和北美规范及我国现行行业标准《低层冷弯薄壁型钢房屋建筑技术规程》(报批稿)计算的构件承载力与试验结果进行分析比较。在此基础上,对高强超薄壁型钢卷边槽形截面轴压构件的承载力合理计算模式进行研究。结果表明:高强超薄壁型钢卷边槽形截面轴压构件在宽厚比较大时会出现畸变屈曲模式;采用等效板件方法计算加劲板件有效宽度后,我国《低层冷弯薄壁型钢房屋建筑技术规程》(报批稿)适用于屈曲强度550MPa、厚度小于2.00mm的冷弯薄壁型钢卷边槽形截面构件承载力计算。
Experimental study was conducted on 63 high-strength cold-formed thin-walled steel crimped groove-section axial compression members with yield strength of 550 MPa. The buckling modes and ultimate bearing capacity of the components were analyzed. Reference will be made to the AISI specification, the Australian specification, the North American specification, and the current industry in China. The analysis and comparison of the component bearing capacity calculated by the standard “Technical Specification for Low-rise Cold-formed Thin-walled Steel Houses” (approved draft) and the test results. On this basis, the reasonable calculation model of the bearing capacity of the high-strength ultra-thin-wall steel crimped grooved section axial compression members was studied. The results show that the deformed buckling mode occurs when the thickness and thickness of the high-strength and ultra-thin-wall steel grooved cross-section axial compression members are large; after the effective width of the stiffened plates is calculated by the equivalent plate method, the low-rise cold-formed thin-wall steel housings in China The “Technical Specification for Buildings” (approval) is applicable to the calculation of the bearing capacity of cold-formed thin-walled steel crimped channel section members with a buckling strength of 550MPa and a thickness of less than 2.00mm.