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建筑中,冷弯型钢梁作为次要结构构件广泛用于支撑屋顶和侧面的包覆层或挡板。因此,这些构件常被视为侧向或旋转方向受到全部或部分约束。给出描述上举荷载作用下局部约束槽钢檩条的弯曲和扭转性能的分析模型。基于薄壁梁的经典弯曲理论推导出屋顶檩条弯曲应力的计算公式。将该模型和欧洲规范(EN1993-1-3)给出的简易模型进行对比。采用该模型和EN1993-1-3分别计算沿卷边、翼缘和腹板的弯曲应力分布,并将计算结构与试验数据和有限元分析结果进行比较,验证了该模型的准确性。
In buildings, cold-formed steel beams are widely used as secondary structural members to support roofing and side cladding or baffles. Therefore, these components are often considered to be fully or partially constrained in the lateral or rotational direction. The analytical model describing the buckling and torsional behavior of partially restrained channel bars under the action of an on-load is given. Based on the classical bending theory of thin-walled beam, the formula for calculating the bending stress of roof purlin is deduced. The model is compared to the simple model given in the European norm (EN 1993-1-3). Using this model and EN1993-1-3, the bending stress distribution along curling, flange and web was calculated respectively. The calculated structure was compared with the experimental data and the finite element analysis to verify the accuracy of the model.