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Behaviour and design of cold-formed steel beams subject to lateral-torsional buckling

机译：弯扭屈曲冷弯型钢的性能与设计

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摘要

Cold-formed steel beams are increasingly used as floor joists and bearers in buildings. Their behaviour and moment capacities are influenced by lateral-torsional buckling when they are not laterally restrained adequately. Past research on lateral-torsional buckling has concentrated on hot-rolled steel beams. Hence a numerical study was undertaken to investigate the lateral-torsional buckling behaviour of simply supported cold-formed steel lipped channel beams subjected to uniform bending. For this purpose a finite element model was developed using ABAQUS and its accuracy was verified using available numerical and experimental results. It was then used in a detailed parametric study to simulate the lateral-torsional buckling behaviour and capacity of cold-formed steel beams under varying conditions. The moment capacity results were compared with the predictions from the current design rules in many cold-formed steel codes and suitable recommendations were made. European design rules were found to be conservative while Australian/New Zealand and North American design rules were unconservative. Hence the moment capacity design equations in these codes were modified in this paper based on the available finite element analysis results. This paper presents the details of the parametric study, recommendations to current design rules and the new design rules proposed in this research for lateral-torsional buckling of cold-formed steel lipped channel beams.
机译：冷弯型钢梁越来越多地用作建筑物的地板托梁和承载梁。当它们的侧向约束不充分时，它们的行为和力矩能力会受到侧向扭转屈曲的影响。以往关于横向扭转屈曲的研究主要集中在热轧钢梁上。因此，进行了数值研究，以研究承受均匀弯曲的简支冷弯型钢唇形通道梁的横向扭转屈曲行为。为此，使用ABAQUS开发了有限元模型，并使用可用的数值和实验结果验证了其准确性。然后将其用于详细的参数研究中，以模拟在不同条件下冷弯型钢梁的横向扭转屈曲行为和承载力。在许多冷弯型钢规范中，将弯矩承载力结果与当前设计规则中的预测结果进行了比较，并提出了适当的建议。欧洲设计规则被认为是保守的，而澳大利亚/新西兰和北美的设计规则却不保守。因此，本文基于可用的有限元分析结果，对这些代码中的矩承载力设计方程进行了修改。本文介绍了参数研究的详细信息，对当前设计规则的建议以及本研究中提出的冷弯钢唇形通道梁的横向扭转屈曲的新设计规则。

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