Selection of the initial geometrical imperfection in nonlinear FE analysis of cold-formed steel rack columns

Bonada, J.; Casafont, Miquel; Roure, Francesc; Pastor, M.M.

doi:10.1016/j.tws.2011.10.003

Cited by 36 publications

(15 citation statements)

References 20 publications

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“…Very recently, Dinis and his research team [11][12][13][14][15] conducted a series of studies on local-distortional-global interaction, post-buckling behaviour and interactive failure analysis in distortional buckling of cold-formed steel lipped channel column. Investigations on selection of the geometric imperfection in numerical analysis of cold-formed steel rack columns were carried out by Bonada et al [16]. Investigations on local-distortional-global buckling interactions of lipped channel columns were carried out by Santos et al [17].…”

Section: Review Of Literaturementioning

confidence: 99%

Behaviour of Partially Closed Stiffened Cold-Formed Steel Compression Member

Manikandan¹,

Arun²

2016

Arab J Sci Eng

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Usually, thin-walled open column sections have an intrinsic weakness in their low torsional strength, which is unpleasant for resistance of an open section. The distortion behaviour of cold-formed steel open section has a significant role in structural steel design. Hence, initiativeness is made for converting partially closed section by adding simple spacer plates connected with self-tapping screws. The intend of this work is tested to estimate the competence of this solution by comparing the strength and performance of partially closed and open stiffened complex channel section under axial compression. The buckling characteristics of the section are computed using the linear elastic buckling analysis program CUFSM. The resistance and behaviour of the intermediate columns are examined in detail using finite element analysis software ANSYS. A good conformity between finite element analysis and experiments is found. The nominal design capacities are evaluated using the necessities of the direct strength method, North American iron and steel specification and Indian standard and are compared with those from test and finite element analysis. After this verification of the numerical model, a crucial parametric study is carried out to inspect the effect of vitiations on thickness, depth, spacing and slenderness of spacer plates. The particulars of this study and results are offered in this research article.

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Section: Review Of Literaturementioning

confidence: 99%

Behaviour of Partially Closed Stiffened Cold-Formed Steel Compression Member

Manikandan¹,

Arun²

2016

Arab J Sci Eng

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“…The whole sample is pinned at both ends and a special device avoids the rotation around the longitudinal axis of the member. More details of the experimental tests can be found in [10].…”

Section: Resultsmentioning

confidence: 99%

“…Pastor et al [9] analysed the influence of the imperfection magnitude in the load carrying capacity of a rack column. The conventional numerical analysis uses a buckling mode to define the geometrical imperfection, but the type of the dominant mode of the buckling shape used for the nonlinear analysis is a key factor to obtain accurate results [10][11].…”

Section: Introductionmentioning

confidence: 99%

Influence of the cold work effects in perforated rack columns under pure compression load

Bonada

Pastor

Roure

et al. 2015

Engineering Structures

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This paper analyses the influence of residual stresses and strain hardening due to the cold rollforming process on the load carrying capacity of perforated rack columns. First of all, a residual strain distribution of the manufacturing process is obtained via a finite element analysis and then it is introduced in the model as initial state to carry out a nonlinear buckling analysis. Two different methodologies to introduce the residual strain pattern are presented in order to reproduce the local stress effects because of perforations. Moreover, the changes of the mechanical properties of the material by strain hardening are evaluated through experimental tests and its influence on the rack column behaviour is investigated. The results obtained agree well with experimental tests and show a method to predict the load carrying capacity of perforated rack column taking into account the effects of the cold roll-forming process.

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“…Consequently, all the issues related on the selection of a right type of a geometrical imperfection introduced as initial state can be avoided (Figure 16). On the other hand, the load carrying capacity and the failure mode obtained from FEA with geometrical imperfection for a pure compression load depends on the shape of the initial perturbation introduced [16]. In Table 4 and Figure 17 the ultimate loads and failure modes obtained by introducing a symmetric distortional (SD) and anti-symmetric distortional (AD) geometric imperfection are compared.…”

Section: Comparison Of Ultimate Loads and Failure Modes Between Expermentioning

confidence: 99%

Distortional Influence of Pallet Rack Uprights Subject to Combined Compression and Bending

Bonada¹,

Pastor²,

Roure³

et al. 2016

Structures

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Selection of the initial geometrical imperfection in nonlinear FE analysis of cold-formed steel rack columns

Cited by 36 publications

References 20 publications

Behaviour of Partially Closed Stiffened Cold-Formed Steel Compression Member

Behaviour of Partially Closed Stiffened Cold-Formed Steel Compression Member

Influence of the cold work effects in perforated rack columns under pure compression load

Distortional Influence of Pallet Rack Uprights Subject to Combined Compression and Bending

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