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该文以既有理论研究成果为基础,结合应用广义梁理论,对两端简支的冷弯薄壁卷边Z形钢梁在绕截面强轴弯矩作用下的弹性畸变屈曲荷载进行了深入细致的分析。通过对45个截面的参数分析,将原先适用于冷弯薄壁卷边槽钢梁的参数计算公式推广应用于Z形钢梁,并根据Z形钢截面的几何特性对相应参数进行了重新推导和修改。利用以上结果,最后提出了冷弯薄壁卷边Z形钢梁在绕强轴弯矩作用下的弹性畸变屈曲荷载简化计算公式。简化公式具有足够的精度、便于手算、实用性强,可供工程设计人员和各国冷弯薄壁型钢设计规范修订相应内容时参考采用。
Based on the existing theoretical research and combined with the generalized beam theory, the buckling loads of cold-formed thin-walled and curled Z-shaped steel beams with simple ends at both ends under the bending moment around the strong axis of the section are deeply studied Detailed analysis. Based on the analysis of the parameters of 45 sections, the formula of the parameters previously applied to the cold-formed thin-walled curling channel steel girder is generalized to the Z-shaped steel girder, and the corresponding parameters are deduced according to the geometric characteristics of the Z-shaped steel section And modify. Based on the above results, a simplified calculation formula of buckling load of the elastic deformation of the cold-formed thin-walled Z-steel beam under bending moment around the strong axis is proposed. Simplification formula has enough accuracy, handy, practicality, for engineering designers and national cold-formed thin-walled steel design code revision reference to the corresponding content.