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对Hancock提出畸变屈曲承载力计算的两条强度曲线公式背景和试验基础进行了研究,并将现行北美规范、澳洲规范及我国行业标准《低层冷弯薄壁型钢房屋建筑技术规程》轴压构件畸变屈曲承载力计算公式与Hancock两条强度曲线之间的关系进行分析比较。在此基础上,建议畸变屈曲承载力有效宽度计算的修正公式,并将其与Hancock两条强度曲线进行比较。此外,采用最近的复杂形式卷边槽形截面的试验结果,对上述3个畸变屈曲承载力计算公式进行分析评价和预测准确性验证。结果表明:Hancock两条畸变屈曲承载力计算曲线为各国现行规范的直接强度法和有效宽度法而采用,但二者在部分区段有一定误差;建议的修正公式基本处于两条计算曲线之间,延伸了适用范围并减小了误差,解决了不同规范的较大计算差值,与直接强度计算结果吻合更好;建议的修正公式和现行规范的2个计算公式均能较好地预测板件中间加劲、边缘二次加劲等复杂截面形式轴压构件的畸变屈曲承载力。
Hancock put forward two formulas for calculating the flexural strength of the flexural strength formula background and experimental basis were studied, and the existing North American norms, Australian norms and our industry standard “low-rise cold-formed thin-walled steel housing construction technical specifications,” the axial compression member distortion The relationship between the formula of flexural capacity and Hancock’s two strength curves is analyzed and compared. On this basis, the formula for calculating the effective width of the distorted buckling capacity is proposed and compared with the two Hancock strength curves. In addition, using the test results of the recent complicated form of curling groove section, the above three formulas for calculating the buckling bearing capacity are analyzed and evaluated and the prediction accuracy is verified. The results show that the calculated curve of Hancock’s two distortional buckling capacities is adopted by both the direct strength method and the effective width method of the current national codes, but both have some error in some sections. The proposed correction formula is basically between two calculation curves , Which extends the scope of application and reduces the error, and solves the large calculation difference between different specifications, which is in good agreement with the direct strength calculation result. Both the proposed correction formula and the two existing calculation formulas can predict the board Piece middle stiffened, the edge of the second stiffener and other complex cross-section axial compression members of the distortional buckling bearing capacity.