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本文在合理等效计算模型基础上,利用卷边槽钢腹板在纵向分布应力作用下对翼缘的转动约束刚度kφ、侧向约束刚度kx及畸变屈曲临界半波长度λ等相关计算公式,并结合弹性介质中薄壁杆件屈曲理论推导了卷边槽形构件的畸变屈曲荷载计算公式。利用本文计算式计算了不同壁厚情况下构件畸变屈曲荷载,并将其计算结果与有限条元软件CUFSM计算结果进行了对比,对比结果表明:本文计算式所得计算结果与有限条元软件CUFSM计算结果比值的平均值为0.997,比值方差为7.5×10-5,说明本文计算式与有限条元软件CUFSM计算结果吻合良好,具有足够的计算精度,且具有良好的稳定性。同时本文计算式比现有文献中同类型计算式更为简洁,便于手算,实用性强,可供工程设计人员和薄壁型钢设计规范修订相应内容时参考。
Based on the reasonable equivalent calculation model, the calculation formulas of the rotational restraint stiffness kφ, the lateral restraint stiffness kx and the critical half-wavelength λ of the buckling under the stress of longitudinal distribution are presented. Based on the buckling theory of thin-walled members in elastic media, the formula for calculating the buckling load of curl-grooved members is deduced. The calculation of the distorted buckling loads of members under different wall thicknesses is carried out by using the formulas in this paper. The calculated results are compared with those of finite element software CUFSM. The comparison results show that the calculation results of this paper are compared with the finite element software CUFSM The results of the ratio of the average value of 0.997, the ratio variance of 7.5 × 10-5, indicating that the calculation of the finite element software and finite element software CUFSM results in good agreement, with sufficient accuracy, and has good stability. At the same time, the calculation formula of this article is more concise than the same type of calculation formulas in the existing literature, which is convenient for calculation and practicality. It can be used as reference for engineering designers and thin-section steel design code revision.