Design of cold-formed stainless steel lipped channel sections with web openings subjected to web crippling under end-one-flange loading condition

Yousefi, Amir M.; Uzzaman, Asraf; Liu, Ying; Clifton, G. Charles; Young, Ben

doi:10.1177/1369433216670170

Cited by 24 publications

(10 citation statements)

References 26 publications

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“…Uzzaman et al [7][8][9][10], Lian et al [11][12][13][14] and Yousefi et al [44][45][46] It can be seen in Fig.11, Fig.12, Fig.13 and Fig.14 means q/h =0.06) and edge-stiffener fillet radius ratio (Rq2 means rq =2 mm).…”

Section: Parametric Studymentioning

confidence: 92%

Cold-formed steel channel sections under end-two-flange loading condition: Design for edge-stiffened holes, unstiffened holes and plain webs

Uzzaman

Lim

Nash

et al. 2020

Thin-Walled Structures

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In cold-formed steel (CFS) channel sections, web holes are becoming increasingly popular. Such holes, however, result in the sections becoming more susceptible to web crippling, especially under concentrated loads applied near the web holes. Traditional web holes are normally punched or bored and are unstiffened. Recently, a new generation of CFS channel sections with edge-stiffened web holes has been developed by the CFS industry and is being widely used. However, no research is available in the literature which investigated the web crippling strength of CFS channel sections with edgestiffened circular web holes under the end-two-flange (ETF) loading conditions. A combination of experimental tests and non-linear FEA were used to investigate the effect of such stiffened holes on web crippling behaviour under ETF loading conditions. The results of 30 web crippling tests are presented. Non-linear FE models are described, and the results are compared against the laboratory test results; a good agreement was obtained in terms of both the strength and failure modes. The results indicate that the stiffened holes can significantly improve the web crippling strength of CFS channel sections. A parametric study involving 1116 FEA was then performed, covering the effect of different hole sizes, edge-stiffener lengths and fillet radii, length of the bearing plates and position of holes in the web. Finally, design recommendations in the form of web crippling strength reduction factors are proposed, that are conservative to both the experimental and FE results. PFEA Web crippling strength per web predicted from finite element (FEA); rq Inside fillet radius between web and hole edge-stiffener; ri Inside fillet radius of section; ROSH Reduction factor for edge-stiffened holes offset to the bearing plates RCSH Reduction factor for edge-stiffened holes down the bearing plates RP (OSH) Proposed reduction factor for edge-stiffened holes offset to the bearing plates

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Section: Parametric Studymentioning

confidence: 92%

Cold-formed steel channel sections under end-two-flange loading condition: Design for edge-stiffened holes, unstiffened holes and plain webs

Uzzaman

Lim

Nash

et al. 2020

Thin-Walled Structures

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“…Uzzaman et al [23][24][25][26] and Yousefi el al. [27,28] conducted experimental and numerical studies to investigate the effect of offset web holes on the web crippling strength of cold-formed steel lipped channel beams. They also did web crippling tests of LCBs without web openings.…”

Section: Previous Studies On Web Cripplingmentioning

confidence: 99%

Experimental Study of Unlipped Channel Beams Subject to Web Crippling Under One Flange Load Cases

Gunalan¹,

Mahendran²

2019

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Cold-formed steel members are becoming increasingly popular in the building industry due to their superior strength to weight ratio and ease of fabrication as opposed to hot-rolled steel members. However, they are susceptible to various buckling modes at stresses below the yield stress of the member because of their relatively high width-to-thickness ratio. Web crippling is one of the failure modes that occurs in steel channel sections under transverse concentrated loads or reactions. Recently a test method has been proposed by AISI to obtain the web crippling capacities under both one-flange and two-flange load cases. Using this test method 21 tests were conducted in this research to investigate the web crippling behaviour and strengths of an unlipped channel section with stocky webs known as DuraGal Channels under end-one-flange (EOF) and interior one-flange (IOF) load cases. DuraGal channels with different web slenderness and bearing lengths were tested with their flanges unfastened to supports. In this re search the suitability of the currently available design rules for unlipped channels subject to web crippling under one flange load cases was investigated, and suitable modifications were proposed where necessary. This paper presents the details of this experimental study and the results.

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“…For aluminium sections, Zhou and Young [18] conducted a series of tests and numerical investigation on web crippling square hollow sections, again with unstiffened web holes. Yousefi et al [19][20][21][22] proposed unified strength reduction factor equations for the web crippling strength of cold-formed stainless steel lipped channel-sections with circular web openings.…”

Section: Introductionmentioning

confidence: 99%

Effects of edge-stiffened circular holes on the web crippling strength of cold-formed steel channel sections under one-flange loading conditions

Uzzaman

Lim

Nash

et al. 2017

Engineering Structures

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Cold-formed steel sections are often used as wall studs or floor joists and such sections often include web holes for ease of installation of services. The holes are normally punched or bored and are unstiffened; when the holes are near to points of concentrated load, web crippling can be the critical design consideration. Recently, a new generation of cold-formed steel channel sections with edge-stiffened circular holes has been developed, for which web crippling may not be so critical. In this paper, a combination of experimental investigation and non-linear elasto-plastic finite element analyses are used to investigate the effect of such edge-stiffened holes under the interior-one-flange (IOF) and end-one-flange (EOF) loading conditions; for comparison, sections without holes and with unstiffened holes are also considered. A total of 90 results comprising 36 tests and 54 finite element analysis results are presented. Owing to manufacturing constraints, in the test programme, the edge-stiffener length was fixed at 13 mm. Good agreement between the experimental and finite element results was obtained. For the case of the unstiffened hole, it is shown that the web crippling strength is reduced by up to 12% and 28% for the IOF and EOF loading conditions, respectively. However, with the edge-stiffened circular hole, the web crippling strength is only reduced by 3% for the IOF loading condition and there is no reduction in strength for the EOF loading condition. The finite element model was used for the purposes of a parametric study on the effects of different hole sizes, edge-stiffener length and distances of the web holes to the near edge of the bearing plate. The results indicate that with a suitable edge-stiffener length, the web crippling strength of cold-formed steel channel section with holes can be as high as the one without holes

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Design of cold-formed stainless steel lipped channel sections with web openings subjected to web crippling under end-one-flange loading condition

Cited by 24 publications

References 26 publications

Cold-formed steel channel sections under end-two-flange loading condition: Design for edge-stiffened holes, unstiffened holes and plain webs

Cold-formed steel channel sections under end-two-flange loading condition: Design for edge-stiffened holes, unstiffened holes and plain webs

Experimental Study of Unlipped Channel Beams Subject to Web Crippling Under One Flange Load Cases

Effects of edge-stiffened circular holes on the web crippling strength of cold-formed steel channel sections under one-flange loading conditions

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