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关于风吸力作用下C形和Z形简支檩条稳定承载力的计算,欧洲规范(Eurocode 3)和我国《门式刚架轻型房屋钢结构技术规程》(CECS 102∶2002)都取其受压下翼缘作为弹性地基上的压杆来求解临界荷载。然而,该方法的计算值与已有试验值相比过于保守。由檩条绕固定轴扭转屈曲的总势能可求得风吸力作用下C形和Z形檩条的弹性临界弯矩,计算其正则化长细比,然后采用修正的欧洲钢结构协会(ECCS)钢梁整体屈曲的稳定系数公式,计算檩条的弹塑性稳定系数,从而求得檩条的稳定承载力。对比结果表明,此方法的计算值与试验值更吻合。
Regarding the calculation of the stable bearing capacity of C-shaped and Z-shaped simply supported purlins under wind suction, both Eurocode 3 and China’s Technical Specification for Steel Structure of Portal Frame Light Housing (CECS 102: 2002) The lower flange serves as the strut on the elastic foundation to solve the critical load. However, the calculated value of this method is too conservative compared with the existing test values. The elastic critical moments of C-shaped and Z-shaped purlins under wind suction can be obtained from the total potential energy of the torsional buckling around the fixed shaft by the stirrups, and the regularized slenderness ratio is calculated. Then, the modified ECCS The overall buckling coefficient of stability of the formula, calculate the Elasto-plastic stability coefficient, so as to obtain the stability of the Slim bearing capacity. The comparison results show that the calculated value of this method is in good agreement with the experimental value.