Study of web crippling in ferritic stainless steel cold formed sections

Bock, Marina; Arrayago, Itsaso; Real, Esther; Arrizabalaga, Enrique Mirambell

doi:10.1016/j.tws.2013.03.015

Cited by 52 publications

(62 citation statements)

References 20 publications

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“…The current implementation of the CSM does not cover slender cross-sections, so consequently CSM bending resistance predictions are not presented for S4-Mj, S4-Mi and S5-Mi cross-sections. Table 6 table demonstrates that results obtained for the web crippling resistances given in EN1993-1-3 [19] are overly conservative, while the predictions using the Bock et al [20] formulation can be seen to be substantially improved over the current codified method. …”

Section: En1993-1-4 and Csm Assessment For Bendingmentioning

confidence: 99%

“…The interaction of the local transverse force and bending moment was investigated through the three-point bending tests, and it was concluded that the interaction expression given in EN1993-1-3 [19] provides excellent results using the expression proposed by Bock et al [20] for the calculation of the web crippling resistance, while the EN1993-1-3 [19] approach is too conservative.…”

Section: En1993-1-4 and Csm Assessment For Indeterminate Structuresmentioning

confidence: 99%

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Experimental study on ferritic stainless steel simply supported and continuous beams

Arrayago

Real

2016

Journal of Constructional Steel Research

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Development of efficient design guidance for stainless steel structures is key for the increased use of this corrosion-resistant material by considering both nonlinear behaviour and strain hardening into resistance prediction expressions, together with the moment redistribution in indeterminate structures. With the aim of analysing the bending moment redistribution capacity of ferritic stainless steel beams, a comprehensive experimental programme on continuous beams is presented. These tests contribute to the assessment of EN1993-1-4 specifications, where no plastic design is allowed, and the classical and new plastic design methods available in the literature for indeterminate stainless steel structures. Four three-point and eight four-point bending tests are also reported for the assessment of current codified and revised cross-sectional classification limits, analysing the different methods for the prediction of the ultimate bending capacities of ferritic hollow sections. Additional test results reported by other authors in different stainless steel grades and carbon steel are also studied and presented. The analysis indicates that Class 1 cross-sectional classification limits are too optimistic for ferritic stainless steels and further research is needed for the extension of plastic design to these grades, although promising predictions of ultimate loads are obtained for austenitic and lean duplex stainless steels.Peer ReviewedPostprint (author's final draft

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Section: En1993-1-4 and Csm Assessment For Bendingmentioning

confidence: 99%

Section: En1993-1-4 and Csm Assessment For Indeterminate Structuresmentioning

confidence: 99%

Experimental study on ferritic stainless steel simply supported and continuous beams

Arrayago

Real

2016

Journal of Constructional Steel Research

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“…Although it was shown that the proposed design equation is appropriate for application to various stainless steels, the statistical uncertainties in material properties that the different types of stainless steels exhibit require an assessment of various partial safety factors. The statistical assessment showed that the proposed resistance function by Bock et al (2013) requires adjustment to satisfy the safety level set out in EN 1993-1-4 (2006); A recalibration is performed herein. The web crippling design provisions given in EN 1993EN -1-3 (2006 and SEI/ASCE 8-02 (2002) American standard for application to stainless steel are also statistically evaluated herein.…”

Section: Introductionmentioning

confidence: 99%

“…While research conducted by Zhou and Young (2006, 2007a, 2007b, 2007c, 2008 focused on the development of web crippling design expressions within the framework of SEI/ASCE 8-02 (2002) American standard and NASPEC-2001NASPEC- (2001 specifications, Talja and Salmi (1995), Talja (2004), Zilli (2004) and Bock et al (2013), among other studies, assessed the European code. It is within this latter research, where a new expression adapted from EN 1993EN -1-3 (2006 was proposed to predict the web crippling resistance of cold-formed stainless steel members.…”

Section: Introductionmentioning

confidence: 99%

“…This resistance function was derived in Bock et al (2013) through the use of carefully validated numerical models with the aim to propose a design expression for stainless steel sections, which are currently designed following the provisions for coldformed carbon steel sections given in EN 1993EN -1-3 (2006. Although it was shown that the proposed design equation is appropriate for application to various stainless steels, the statistical uncertainties in material properties that the different types of stainless steels exhibit require an assessment of various partial safety factors.…”

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confidence: 99%

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Statistical evaluation of a new resistance model for cold-formed stainless steel cross-sections subjected to web crippling

Bock

Real

2015

Int J Steel Struct

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This paper presents a statistical evaluation according to Annex D of EN 1990(2002 of a new resistance function for web crippling design of cold-formed stainless steel crosssections. This resistance function was derived in Bock et al. (2013) through the use of carefully validated numerical models with the aim to propose a design expression for stainless steel sections, which are currently designed following the provisions for coldformed carbon steel sections given in EN 1993EN -1-3 (2006. Although it was shown that the proposed design equation is appropriate for application to various stainless steels, the statistical uncertainties in material properties that the different types of stainless steels exhibit require an assessment of various partial safety factors. The statistical assessment showed that the proposed resistance function by Bock et al. (2013) requires adjustment to satisfy the safety level set out in EN 1993-1-4 (2006); A recalibration is performed herein. The web crippling design provisions given in EN 1993EN -1-3 (2006 and SEI/ASCE 8-02 (2002) American standard for application to stainless steel are also statistically evaluated herein. Comparison with test and numerical data showed that the predictions of the recalibrated resistance function are better suited and consistent than existing design provisions.

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Web Crippling Behavior of Sigma Purlins

Almatrafi¹,

Theofanous

Bock

et al. 2021

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Due to their thin‐walled nature and complex geometry, cold‐formed steel purlins are prone to a variety of instabilities. In most applications, purlins rely on the attached sheeting to restrain member buckling and hence their cross‐section is optimized to maximize their cross‐sectional resistance to local and distortional buckling caused by sagging bending moments under the action of a uniformly distributed load. Sigma purlins are a family of cold‐formed steel members with folding‐lines along their webs. The non‐straight geometry of their web is beneficial in terms of reducing the local slenderness of the web, however it increases their susceptibility to web crippling in case the purlins are subjected to concentrated transverse loads and hence it may reduce the overall moment resistance. This study reports a series of experimental tests on sigma purlins interior‐one‐flange (IOF) loading condition. The tested specimens employ two different section geometries and three different bearing plate widths. The test results show that all the specimens failed by web crippling, however two distinct failure modes and corresponding load‐deformation curves are observed depending on the section geometry. To investigate further the effect of web geometry on the IOF web crippling strength of sigma sections, an FE model was developed and validated against the reported test results. Following successful replication of the experimental observations, a comprehensive parametric study was performed and several sigma sections were numerically tested. Furthermore, the applicability of a novel slenderness‐based design approach previously proposed by Duarte and Silvestre for the web crippling design of channel sections is assessed and design recommendations are proposed.

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Study of web crippling in ferritic stainless steel cold formed sections

Cited by 52 publications

References 20 publications

Experimental study on ferritic stainless steel simply supported and continuous beams

Experimental study on ferritic stainless steel simply supported and continuous beams

Statistical evaluation of a new resistance model for cold-formed stainless steel cross-sections subjected to web crippling

Web Crippling Behavior of Sigma Purlins

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