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采用开口薄壁杆件理论及考虑腹板局部变形的拉条有效刚度,提出单跨跨中设置拉条的连续两跨C形冷弯薄壁檩条的弯扭屈曲的总势能;经过ANSYS的壳单元分析,从广泛的参数范围考察了檩条的屈曲模态;应用Ritz法得到风吸力作用下连续两跨C形檩条的近似临界荷载计算式,并将其临界弯矩与半跨纯弯简支檩条的临界弯矩进行比较,最终得到临界弯矩系数。
Based on the theory of thin-walled bars and the effective stiffness of the braces considering the local deformation of the web, the total potential energy of bending and torsional buckling of two consecutive C-shaped cold-formed thin-walled purlins with braces in a single span is proposed. After ANSYS shell Element analysis, the buckling mode of purlin was investigated from a wide range of parameters. The approximate critical load calculation formula of continuous two-span C-shaped purlin with wind suction was obtained by Ritz method. Slab of the critical moment compared to the final critical moment coefficient.