Calibration of European web‐crippling equations for cold‐formed C‐ and Z‐sections

Abstract

Current design equations given in EN 1993‐1‐3 for calculating the web‐crippling resistance of cross‐sections with one web were copied from the AISI's Specification for the design of cold‐formed steel structural members, taking into account the different safety concepts: load and resistance factor design (LRFD), with resistance factors ϕw applied to nominal values, and limit state design, with partial factors γM applied to characteristic values as defined in EN 1990. Furthermore, the web‐crippling equations of subsequent editions of the AISI specification (then designated AISI S100) were completely revised based on the web‐crippling data collected and evaluated by Beshara and Schuster [5]. This paper presents the results of a calibration of a generalized web‐crippling equation to be used for cross‐sections with one web (i.e. C‐ and Z‐sections). The coefficients of the generalized web‐crippling equation were calibrated to comply with the safety concept described in EN 1990, taking into account EN 1990, Annex D, and a partial factor γM1 = 1.1. This paper therefore provides an introduction to as well as background information on proposed changes and amendments to EN 1993‐1‐3.

Web crippling behaviour and design of aluminium SupaCee sections

“…Particularly, investigations regarding web crippling behaviour are crucial considering the thin web of cold-formed sections. Web crippling failures are categorised and defined as End-Two-Flange (ETF), Interior-Two-Flange (ITF), End-One-Flange (EOF) and Interior-One-Flange (IOF) based on the loading patterns [1][2][3][4][5]. Accordingly, Husam et al [6] carried out experimental investigation on aluminium Lipped Channel Beams (LCB) under two-flange load cases and compared the results with existing design equations.…”