Abstract The cold-formed steel members often require web openings to allow for building services such as mechanical piping, electrical wiring, and air conditioning systems pass through the ceiling and therefore reduce the building overall height and as a result, lateral forces induced on the building. Stress distribution in members with openings is different from members without holes and therefore characteristics, shape and modes of their buckling are dissimilar which results in reduced buckling capacity and ultimate strength. In order to compensate some of the lost capacity, edge and intermediate stiffeners are fabricated into the web which complicates the characteristics and buckling mode. In this study, a set of analytical solutions for the local buckling of cold-formed steel webs with rectangular openings stiffened by intermediate and edge stiffeners subjected to compression, bending and their combination is developed, and summarized. The main variables are elastic modulus, Poisson's ratio, height of openings to height of web, aspect ratio of openings, moment of inertia of intermediate and edge stiffeners to moment of inertia of reduced web section, and stress distribution gradient above or under the hole. The proposed solutions can be used for a wide range of rectangular web openings. Analyses are conducted using energy based methods and the results are compared with numerical data obtained from the commercial finite element software (Abaqus). The numerical results demonstrate that one of the eight proposed formulas with minor modification can be successfully used to predict the critical buckling stress.

中文翻译：

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加筋矩形开孔冷弯型钢腹板局部屈曲分析

摘要 冷弯型钢构件通常需要腹板开口，以允许机械管道、电线和空调系统等建筑服务穿过天花板，从而降低建筑物的整体高度，从而减少建筑物上的侧向力。 . 有孔构件的应力分布与无孔构件不同，因此它们的屈曲特性、形状和模式不同，导致屈曲能力和极限强度降低。为了补偿一些损失的能力，边缘和中间加强筋被制造到腹板上，这使特性和屈曲模式复杂化。在这项研究中，开发并总结了由中间和边缘加劲肋加固的矩形开口冷弯型钢腹板局部屈曲的一组解析解。主要变量是弹性模量、泊松比、开口高度与腹板高度、开口纵横比、中间和边缘加强筋的惯性矩与减小腹板截面的惯性矩以及孔上方或下方的应力分布梯度。建议的解决方案可用于各种矩形腹板开口。使用基于能量的方法进行分析，并将结果与​​从商业有限元软件 (Abaqus) 获得的数值数据进行比较。