Axial capacity of CFS built-up columns comprising of lipped channels with spacers: Nonlinear response and design

Anbarasu, M.; Dar, M. Adil

doi:10.1016/j.engstruct.2020.110559

Cited by 30 publications

(10 citation statements)

References 34 publications

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“…This adds significantly to the strength and stiffness characteristics of the gapped built-up column. The past studies on gapped CFS built-up columns comprised of angles (Dar et al, 2021a;2018;Anbarasu and Dar, 2020a;EI Aghoury et al, 2013), channels (Meza et al, 2020;Anbarasu and Venkatesan, 2019;Ghannam, 2017;Anbarasu and Dar, 2020b;Anbarasu and Vijayanad, 2017;Roy et al, 2018;Dar et al, 2021b;2020;Rahnavarad et al, 2021;Muthuraman et al, 2020;Vijayanand and Anbarasu, 2020;Kherbouche and Megnounif, 2019;Anbarasu et al, 2015;Dabaon et al, 2015a; and tubes (Chen et al, 2020) as chord members. Although, most of these studies mainly adopted channels as chords.…”

Section: Introductionmentioning

confidence: 99%

Cold-formed steel battened built-up columns: Experimental behaviour and verification of different design rules developed

Dar

Vijayanand²,

Anbarasu³

et al. 2021

Advances in Structural Engineering

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Some of the past studies on cold-formed steel (CFS) battened built-up columns have resulted in the development of new design rules for predicting their axial strengths. However, the main drawbacks of such studies are that they are purely numerical and the numerical models developed for such parametric studies were validated using the test results on similar built-up column configurations, but not the exact ones. Therefore, experimental studies on CFS battened columns comprising of lipped channels are needed for verifying the accuracy of the proposed design rules for CFS battened columns. This paper reports an experimental study performed on CFS built-up battened columns under axial compression. Adequately spaced identical lipped channels in the back-to-back arrangement were used as chords and were connected by batten plates laterally with self-driving screws to form the built-up members. The dimensions of chords were fixed as per the geometric limits given out in the North American Specifications (NAS) for the design of CFS structural members. The sectional compactness of the chords and the overall slenderness of the built-up columns were varied by altering the thickness of the channels and height of the built-up columns, respectively. A total of 20 built-up sections were tested under uniform compression to investigate the behavioural changes in the built-up columns due to these variations. The behaviour assessment was made in terms of peak strengths, load–displacement response and failure modes of the test specimens. The current design standards on CFS structures were used to determine the design strengths and were compared against the test strengths for assessing their adequacy. Furthermore, as discussed in the beginning, the test strengths were used to verify the accuracy of the different relevant proposed design rules in the literature.

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Section: Introductionmentioning

confidence: 99%

Cold-formed steel battened built-up columns: Experimental behaviour and verification of different design rules developed

Dar

Vijayanand²,

Anbarasu³

et al. 2021

Advances in Structural Engineering

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“…Using this section, researches were done in [6,7,18,[42][43][44][45][46]. Roy et al [42] found 53% appropriateness in AISI and AS/NZS strength predictions of columns with link-channels at intermediate.…”

Section: Lipped Channels Connected Back-to-back With Gapmentioning

confidence: 99%

“…Further, 228 models were taken for parametric study and the adequacy of EC3 and AISI specifications were checked [45]. Followingly, Anbarasu and Adil Dar [43] found that the resistance to local buckling could be achieved by incorporating spacers in open built-up columns. Recently, Muthuraman et al [44] found safe predictions of DSM with the battened columns having a slenderness ratio less than 60.…”

Section: Lipped Channels Connected Back-to-back With Gapmentioning

confidence: 99%

Study on Strength and Behaviour of Cold-Formed Steel Built-up Columns

Sivasathya

Vijayanand

Prabha

et al. 2021

Recent Advancements in Geotechnical Engineering

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Abstract. Cold-formed Steel (CFS), a sort of steel weighing lesser, suits to be a wise choice of material in the construction of steel structures. It has more benefits that indeed make CFS get famous. Effortless installation can be accomplished with the CFS. It also renders a factor that only a few materials show, that is, longevity. Corrosion does not affect the CFS. Employing under moderate loads, CFS finds to be economically feasible when compared with hot-rolled steel. It can be used as compression members comprising single or built-up members. Since a single member cannot sustain the heavy load, the built-up members can be utilized. Open and closed sections are the two sorts of built-up profiles and these profiles show diverse buckling characteristics. This paper lays out a clear outline of the research works done on providing design recommendations to the codes by employing diverse built-up sections. It is reviewed by categorizing the investigated research works based on the kind of CFS sections chosen by each researcher. It was evident from the study that after validation, many researchers have done parametric study on CFS built-up columns to assess the accuracy of the design strength prediction by code specifications. Many codes failed to estimate the section’s ultimate capacity accurately as there are no specific design equations.

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“…e improved design procedure was proposed in the basic of AS/NZS specifications and European standards. e numerical investigation was conducted for the axial capacity and the nonlinear deformation response of pin-ended CFS built-up columns connected with spacers by varying the plate slenderness of the lipped channels, unbraced chord slenderness, and global slenderness [23]. e new design equations for the reliable design strength predictions of the CFS built-up column composed of lipped channels with spacers were proposed.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study and Direct Strength Method for Cold-Formed Steel Built-Up I-Sectional Columns under Axial Compression

Yao¹

2021

Mathematical Problems in Engineering

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The objective of this paper is to investigate the buckling behavior and design method of the ultimate strength for the cold-formed steel (CFS) built-up I-sectional columns under axial compression which failed in distortional buckling and interactive buckling. A total of 56 CFS built-up I-sectional columns subjected to axial compression were tested, and the different buckling modes and ultimate strengths were analyzed in detail by varying the thickness, the length, the spacing of screws, the end fastener group, and the cross-sectional dimensions of CFS built-up I-sectional columns. It was shown in the test that noticeable interaction of local and distortional buckling or interaction of local, distortional, and global buckling was observed for the built-up I-sectional columns with different lengths and cross-sectional dimensions. A finite element model (FEM) was developed and validated with experimental results. A further parametric study has been conducted including different cross sections and slenderness ratios for the built-up I-sectional columns. The load-carrying capacities obtained from the experimental and numerical study were used to investigate the feasibility of the current direct strength method (DSM) when DSM was applied to CFS built-up I-sectional columns. The comparison results showed that the current DSM is not safe for CFS built-up columns failed in distortional buckling and interactive buckling. Therefore, the improved design formulas were proposed, and their accuracy was verified by using finite element analysis (FEA) and experimental results of CFS built-up I-sectional columns subjected to axial compression.

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Axial capacity of CFS built-up columns comprising of lipped channels with spacers: Nonlinear response and design

Cited by 30 publications

References 34 publications

Cold-formed steel battened built-up columns: Experimental behaviour and verification of different design rules developed

Cold-formed steel battened built-up columns: Experimental behaviour and verification of different design rules developed

Study on Strength and Behaviour of Cold-Formed Steel Built-up Columns

Experimental Study and Direct Strength Method for Cold-Formed Steel Built-Up I-Sectional Columns under Axial Compression

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