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International Journal of Steel Structures

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22-02-2023

Numerical Investigation into Web Crippling of Cold-Formed Lipped Z-sections under Two-Flange Loadings

Authors: R. Dwivedi, A. Y. Vyavahare

Published in: International Journal of Steel Structures | Issue 3/2023

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Abstract

This paper aims to evaluate the web crippling capacities of cold-formed Z-sections under two-flange load cases defined in the AISI Specification. The design specification provides an empirical equation to determine the web crippling strength. However, the results from this equation for different loading and support conditions are not consistent as it predicts unconservative for certain cases and over-conservative for some other cases. In this study, web crippling capacities of Z-sections are determined using validated finite element models and compared with the AISI Specification. The comparison showed that the empirical equation predicts adequate strength for fastened support conditions and conservative strength for unfastened support conditions under End-Two-Flange (ETF) load case. For the Interior-Two-Flange (ITF) load case, the empirical equation predicts unconservative strength for fastened support conditions and over-conservative strength for unfastened support conditions. Therefore, a detailed numerical study is carried out to recommend new web crippling coefficients using a parametric study under both loading cases for fastened and unfastened support conditions. The parametric study is based on 540 finite element models. Based on the results of this study new web crippling design equations are proposed for both load cases and support conditions using the direct strength method.

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Title: Numerical Investigation into Web Crippling of Cold-Formed Lipped Z-sections under Two-Flange Loadings
Authors: R. Dwivedi
A. Y. Vyavahare
Publication date: 22-02-2023
Publisher: Korean Society of Steel Construction
Published in: International Journal of Steel Structures / Issue 3/2023
Print ISSN: 1598-2351
Electronic ISSN: 2093-6311
DOI: https://doi.org/10.1007/s13296-023-00717-3

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