上举荷载作用下局部约束槽钢檩条的弯曲分析

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。

Bending Analysis of Partially Restrained Channel-Section Purlins Subjected to Up-Lift Loadings

Cold-formed steel section beams are widely used as the secondary structural members in buildings to support roof and side cladding or sheeting. These members are thus commonly treated as the restrained beams either fully or partially in its lateral and rotational directions. In this paper an analytical model is presented to describe the bending and twisting behaviour of partially restrained channel-section purlins when subjected to uplift loading. Formulae used to calculate the bending stresses of the roof purlins are derived by using the classical bending theory of thin-walled beams. Detailed comparisons are made between the present model and the simplified model proposed in Eurocodes (EN 1993-1-3). To validate the accuracy of the present model, both available experimental data and finite element analysis results are used, from which the bending stress distributions along the lip, flange and web lines are compared with those obtained from the present and EN 1993-1-3 models.