A design rule for web crippling of cold-formed steel lipped channel beams based on nonlinear FEA

Macdonald, Martin; Heiyantuduwa, M.A.

doi:10.1016/j.tws.2012.01.003

Cited by 41 publications

(25 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The support system was designed to ensure that the test beam had pinned supports at the top and bottom using half rounds. Single channel section was considered for ETF and ITF load cases as was done in[20][21][22][23][24]. It should be noted that no sign of twisting was observed during experiments.…”

mentioning

confidence: 99%

Web crippling tests of cold-formed steel channels under two flange load cases

Gunalan

Mahendran

2015

Journal of Constructional Steel Research

View full text Add to dashboard Cite

Cold-formed steel members have many advantages over 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 a form of localized failure mode that can occur when the members are subjected to transverse high concentrated loadings and/or reactions. The four common loading conditions are the end-oneflange (EOF), interior-one-flange (IOF), end-two-flange (ETF) and interior-two-flange (ITF) loadings. Recently a test method has been proposed by AISI to obtain the web crippling capacities under these four loading conditions. Using this test method 42 tests were conducted in this research to investigate the web crippling behaviour and strengths of unlipped channels with stocky webs under ETF and ITF cases. DuraGal sections having a nominal yield stress of 450 MPa were tested with different web slenderness and bearing lengths. The flanges of these channel sections were not fastened to the supports. In this research the suitability of the currently available design rules for unlipped channels subject to web crippling was investigated, and suitable modifications were proposed where necessary. In addition to this, a new design rule was proposed based on the direct strength method to predict the web crippling capacities of tested beams. This paper presents the details of this experimental study and the results.

show abstract

mentioning

confidence: 99%

Web crippling tests of cold-formed steel channels under two flange load cases

Gunalan

Mahendran

2015

Journal of Constructional Steel Research

View full text Add to dashboard Cite

show abstract

“…Indeed, a comprehensive theoretical model is yet to be developed and such task appears to be extremely complicated. The seminal investigation by Winter and Pian [3] preceded a large number of experimental studies [4][5][6][7][8][9], which included the calibration of design expressions.With the advent of very powerful computers, the recent trend is the performance of numerical investigations to advance the knowledge on the web crippling behaviour of coldformed steel members [7,[9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Direct strength prediction of web crippling failure of beams under ETF loading

Natário

Silvestre

Camotim

2016

Thin-Walled Structures

View full text Add to dashboard Cite

This paper proposes a new approach to predict the web crippling failure load of cold-formed steel beams under External Two Flange (ETF) loading using the Direct Strength Method (DSM). After the description of the existing test data, Eurocode 3 [1] and the North-American Specification [2] are used to predict the corresponding web crippling failure loads and the accuracy of such predictions is briefly assessed. In order to obtain additional information on the web crippling behaviour of each test specimen, non-linear numerical simulations are performed. Since the calibration of the DSM-based design expressionsrequires the previous calculation of (i) elastic buckling loads and (ii) plastic strengths/loads, two procedures are presented to achieve these goals. While the buckling loads are determined using the GBTWEB software, specifically developed for this purpose,the plastic loadsare calculated by means of analytical expressions based on yield-line models. By adopting a non-linear regression procedure, the coefficients of a DSM-based formula are determined on the basis of the set of 128 experimental results available and the corresponding buckling and plastic load values. In spite of the different cross-sections, fastening conditions and test setups considered in the calibration procedure, it is possible to establish a clear relationship between the web crippling slenderness and the nominal-to-plastic load ratio. Finally, it is shown that the developed/proposed DSM-basedformula for ETF web crippling design yields reliable predictions, since they are associated with aLRFD (Load and Resistance Factor Design) resistance factor=0.81, which is located within the range of valuescurrently adopted in the 2012 NAS [2].

show abstract

“…The exemplary papers dealing with local buckling of thin-walled structures are those written by Davis and Hancock [7], Graves-Smith [11] or Mulligan and Pekoz [25]. The buckling of open section beams was the subject of the papers written by Magnucki [14,24], Ovesy [27], Macdonald [21,23]. In the worldwide literature, studies into nonlinear problems of stability of thin-walled structures made of orthotropic materials can be found easily.…”

Section: Introductionmentioning

confidence: 99%