Composed columns from cold-formed steel Z-profiles: Experiments and code-based predictions of the overall compression capacity

Georgieva, Iveta; Schueremans, Luc; Pyl, Lincy

doi:10.1016/j.engstruct.2011.12.017

Cited by 54 publications

(13 citation statements)

References 12 publications

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“…On the other hand, mid-height stress and strain definitions are also frequently used, especially in the fields of mechanical and civil engineering [53,54]. The mid-height area is particularly easy to measure (using e.g.…”

Section: Stress Definition and Mechanical Responsementioning

confidence: 99%

Mechanical properties and dislocation nucleation in nanocrystals with blunt edges

Amodeo

Lizoul

2017

Materials & Design

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The deformation of blunt nanocrystals under uniaxial compression is modelled using molecular dynamics simulations. Ni3Al blunt nanoparticles are built using a simple algorithm that allows continuous shape design from perfectly-sharp nanocubes to nanospheres including a large set of cuboid shapes. Simulation results show that blunt nanoparticles are significantly stronger in comparison to their perfectly cubic counterparts and deform due to the nucleation of partial dislocations and deformation twins. Furthermore, while the early plastic deformation of nano-objects is generally attributed to the nucleation of dislocations from the surface, here we show that homogeneous dislocation nucleation may also happen in blunt nanoparticles and a size-dependent transition parameter is defined. This study emphasizes how much the design of virtual samples is crucial when modelling nano-objects mechanical properties using molecular dynamics simulations and provides new insights onto potential incipient plasticity features at the nanoscale.

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Section: Stress Definition and Mechanical Responsementioning

confidence: 99%

Mechanical properties and dislocation nucleation in nanocrystals with blunt edges

Amodeo

Lizoul

2017

Materials & Design

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“…Previous researches made by Rondal and Niazzi [7] based on the formulas given by Johnson [6] for spaced hot rolled columns in which the battens are attached to the chords by hinged connections, are the only dedicated recommendations to calculate the resistance of such cold-formed built-up members. Georgieva et al [4] evaluated the normal force capacity of columns with built-up cross-section shapes from CFS profiles according to the direct strength method. Aslani and Goel [2] verified the modified slenderness ratio analytically and experimentally for hot-rolled members, thereby verifying the AISC built-up member design method.…”

Section: Literature Reviewmentioning

confidence: 99%

An Investigation of the Compressive Strength of Cold-Formed Steel Built up Channel Sections

Ananthi

Palani

Iyer

2014

Advances in Structural Engineering

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Cold-formed steel members have been used extensively in low and midrise residential building construction. The usage of cold-formed steels as primary structural members has been increased due to its high load to weight ratio. Coldformed steel built-up sections are commonly used as compression elements to carry larger loads and over longer spans when a single individual section is insufficient. However, not much research has been done on built-up sections. This paper aims to investigate the compressive capacity of pin-ended cold-formed steel built-up lipped channel sections using finite element analysis (FEA). In the study, cold-formed steel built-up lipped channel consists of two identical C-channel sections oriented back to back with spacing between them and having a ratio of I xx = I yy which are connected by battens at top and at bottom throughout its lengths at regular intervals according to code based provisions. A non-linear finite element model is developed and verified against theoretical results. The thickness of the members is thin and hence they are susceptible to buckling, shell elements S4R are used in FE modeling. The theoretical analysis is based on effective width method and direct strength method and the results are generally conservative for cold-formed steel built-up channel sections.

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“…Tests on built-up compression members with closely spaced chords were undertaken by many researchers, in which CFS built-up columns were formed by plain and lipped channel sections with and without web stiffeners (Fratamico et al 2018a, 2018b; Georgieva et al, 2012a; Liao et al, 2017; Liu and Zhou, 2017; Lu et al, 2017; Lue et al, 2006; Piyawat et al, 2013; Whittle and Ramseyer, 2009; Young and Chen, 2008; Zhang and Young, 2012, 2018). Vishnuvardhan and Knight (2008) conducted compression tests on CFS single angles, double angles welded back-to-back and starred angles under different end connections.…”

Section: Introductionmentioning

confidence: 99%

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

Anbarasu¹

2019

Advances in Structural Engineering

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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.

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Composed columns from cold-formed steel Z-profiles: Experiments and code-based predictions of the overall compression capacity

Cited by 54 publications

References 12 publications

Mechanical properties and dislocation nucleation in nanocrystals with blunt edges

Mechanical properties and dislocation nucleation in nanocrystals with blunt edges

An Investigation of the Compressive Strength of Cold-Formed Steel Built up Channel Sections

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

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