Web crippling design of cold‐formed ultra‐high strength steel lipped channels under ITF loading: A numerical parametric investigation

M. Anbarasu, Mohammad Adil Dar, Gopal Mohan Ganesh, M. Kathiresan
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Abstract

In recent years, there has been a compelling need to adopt cold‐formed ultra‐high‐strength steel (CFUSS) in the construction industry owing to its numerous advantages, such as a higher strength‐to‐weight ratio, flexibility in achieving desired shapes, and adaptability over longer spans. Among the various applications, CFUSS lipped channel sections are commonly used as purlins and joists in steel structural systems. However, these sections are susceptible to different failure modes, particularly web crippling, which presents significant challenges. Currently, the current design rules lack specific guidelines for estimating the web crippling capacity of CFUSS sections. To address this crucial gap, the present study focuses on a comprehensive numerical investigation of the web crippling response of CFUSS lipped channel sections under interior‐two‐flange (ITF) loading conditions. Finite element (FE) models were developed using the ABAQUS package, verified against published test data, and subsequently used in an extensive parametric study. The ultimate web crippling capacity obtained from the parametric study was used to evaluate the accuracy of the current design equations in various design standards. The findings revealed that the existing design equations inadequately predicted the ultimate web crippling capacity of CFUSS lipped channel sections subjected to the ITF loading condition. Consequently, a modified design equation is proposed, utilizing the same approach as the current design standards, and a new direct strength method (DSM) approach is developed and verified through reliability analysis. The proposed modified design equations offer promising solutions to ensure safer and more reliable design practices for CFUSS structures in the construction industry.
ITF 荷载下冷弯超高强度钢斜槽的腹板削弱设计:数值参数研究
近年来,由于冷弯超高强度钢(CFUSS)具有众多优点,如较高的强度-重量比、实现所需形状的灵活性以及对较长跨度的适应性,因此建筑行业迫切需要采用冷弯超高强度钢。在各种应用中,CFUSS 槽型钢通常用作钢结构系统中的檩条和托梁。然而,这些截面容易受到不同失效模式的影响,尤其是腹板残缺,这就带来了巨大的挑战。目前,现行的设计规则缺乏估算 CFUSS 截面腹板破坏能力的具体指导原则。为弥补这一重要缺陷,本研究重点对 CFUSS 有衬里槽钢截面在内部两翼缘(ITF)加载条件下的腹板脆化响应进行了全面的数值研究。研究使用 ABAQUS 软件包开发了有限元 (FE) 模型,并根据已公布的测试数据进行了验证,随后将其用于广泛的参数研究。通过参数研究获得的极限腹板瘫痪能力被用于评估各种设计标准中现行设计方程式的准确性。研究结果表明,现有的设计方程对 CFUSS 有衬里水渠断面在 ITF 荷载条件下的极限腹板挠曲能力预测不足。因此,利用与现行设计标准相同的方法,提出了修改后的设计方程,并开发了一种新的直接强度法(DSM)方法,通过可靠性分析进行了验证。所提出的修改设计方程为确保建筑行业 CFUSS 结构的设计实践更加安全可靠提供了可行的解决方案。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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