Behaviour of cold-formed steel built-up battened columns composed of four lipped angles: Tests and numerical validation

Abstract

This article mainly investigates the behaviour and strength of built-up battened box column composed of lipped angles under axial compression. Ten specimens were fabricated and tested under pinned with warping-restrained end condition including two different cross-section dimensions of columns with five different geometric lengths. Three material tensile coupon tests were conducted to obtain the material properties of the steel used for fabricating the test specimens. The overall initial geometric imperfections were measured. The plate slenderness, member slenderness, chord slenderness and slenderness of batten plates may affect the compression behaviour of cold-formed steel built-up battened box columns and were accordingly investigated. It was found that the chord slenderness significantly affects the compressive strength of the built-up columns. Test results, including the compression resistances, the load versus displacement responses and the deformed shapes were presented. The test strengths were compared with the design strengths predicted using the North American Specifications (AISI-S100:2016), EuroCode (EN1993-1-3:2006) and design equations proposed by EI Aghoury et al. The design strengths predictions by these two design standards were unconservative, with EI Aghoury et al.’s standard performing better. Finite-element models were developed and verified against the test results.

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

“…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.…”

“…Although, most of these studies mainly adopted channels as chords. Different types of lateral connecting elements were adopted, which include plates over the full column height (Meza et al, 2020;Anbarasu and Venkatesan, 2019;Ghannam, 2017), web-spacers (Anbarasu and Dar, 2020b;Anbarasu and Vijayanad, 2017;Roy et al, 2018) at intermediate locations, lacing bars (Dar et al, 2018(Dar et al, , 2019(Dar et al, , 2021a and batten plates (Anbarasu and Dar, 2020a;Anbarasu, 2020;EI Aghoury et al, 2013;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;. These studies include both experimental and numerical investigations.…”

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

“…Four angle sections were connected by battens [19][20][21] and lacings [12,22,23] to form a closed section and investigations were carried out. Pin-ended laced columns with bolt connectivity were tested under monotonic axial loading experimentally.…”

“…New design provisions were put forward as the current rules were not satisfactory. Yet another research on closed section with four lipped angles connected by battens was presented in [20]. It was clear that the capacity of the section increased with the lower slenderness of the chord.…”

Experimental Optical Testing and Numerical Verification by CuFSM of Compression Columns with Modified Channel Sections

“…Zaczynska and Kazmierczyk [ 20 ] performed a parametric study of medium-length beams made of variable functional gradation materials (FGM) consisting of aluminium and titanium layers. In publication [ 21 ], the compression resistance, load-axial shortening response and deformed shapes are presented. Nonlinear finite element models were developed.…”