Experimental study of cold-formed steel built-up columns

Meza, Francisco; Becque, Jurgen; Hajirasouliha, Iman

doi:10.1016/j.tws.2019.106291

Cited by 64 publications

(30 citation statements)

References 17 publications

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“…The presented research is part of a wider investigation into built-up cold-formed structural members (Meza et al 2016, Meza 2018, Meza et al 2019. The data gathered from the experiments will be used to develop accurate FE models which will serve as a tool to further study the the behaviour of built-up CFS members through parametric studies.…”

Section: Discussionmentioning

confidence: 99%

“…The program sought to investigate the various cross-sectional instabilities in the beams, the interaction between the cross-sectional components during buckling and the effect of the connector spacing on the buckling modes and the ultimate capacity of the built-up beams. This experimental work fits within a wider programme investigating CFS built-up members, which also includes CFS built-up column tests (Meza et al 2016(Meza et al , 2019, with the eventual goal of developing practical design rules for these types of structural members.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study of Cold-Formed Steel Built-Up Beams

2020

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This paper describes a comprehensive experimental program on cold-formed steel built-up beams with two different cross-sectional geometries. The work aimed to experimentally investigate the interaction between the individual components under increasing loading and to quantify the effect of the connector spacing on the cross-sectional moment capacity and the behaviour of the beams. In total, 12 specimens were tested in a four-point bending configuration, with lateral restraints provided at the loading points in order to avoid global instabilities. The built-up specimens were composed of three or four plain channels with nominal thicknesses of 1.2 mm and 1.5 mm, which were joined together using M6 bolts. Each built-up geometry was tested with three different connector spacings. The specimens were designed to fail by local buckling of their components. Additionally, strut buckling of the channel comprising the top flange in between connector points was observed. The local buckling deformations and the beam deflections were recorded during the tests. The material properties of the test specimens were determined by means of coupon tests and the geometric imperfections were measured prior to testing. The experimental results showed clear evidence of interaction between the local buckling patterns of the components, with the interaction being affected by the connector spacing and the type of geometry. However, the connector spacing showed a less significant effect on the ultimate capacity when failure was governed by local instabilities of the components.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Study of Cold-Formed Steel Built-Up Beams

2020

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“…Single C and U-shaped sections were connected by screws and investigated in [24][25][26][27][28][29][30]. Various parameters on multi-limbs stub columns were analyzed by ANSYS.…”

Section: Connecting C and U-shaped Elementsmentioning

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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“…Finally, SLS checks, which are used to control the deflection of the designed CFS members, are briefly described. While it is more accurate to consider the column and beam elements as built-up members [23], the interactions between the back-to-back channels were neglected in this study for the sake of simplicity and providing more conservative design solutions. (1) where:…”

Section: Design Of Cfs Elementsmentioning

confidence: 99%

Coupled element and structural level optimisation framework for cold-formed steel frames

Phan

Mojtabaei

Hajirasouliha

et al. 2020

Journal of Constructional Steel Research

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Optimisation of cold-formed steel (CFS) structures can be challenging due to the complex behaviour of thin-walled CFS sections affected by different buckling modes. In this paper, a coupled framework is presented for element and structural level optimisation of CFS portal frames, under serviceability limit state (SLS) and ultimate limit state (ULS) conditions, using Genetic Algorithm. First, CFS lipped-channel beam sections are optimised with respect to their flexural capacity determined in accordance with the effective width method specified in Eurocode 3 (EC3). The relative dimensions of the cross-section are considered as the main design variables, while the EC3 plate dimensions and slenderness limits and a number of manufacturing and end-use constraints are taken into account in the optimisation process. The results show that the optimum CFS sections exhibit significantly higher (up to 84%) ultimate capacity compared to the standard lipped channel sections with the same plate width and thickness. The structural level optimisation is then carried out to obtain the optimal design solution for a long-span CFS portal frame with knee braces under SLS and ULS conditions. Compared to conventional optimisation using standard cross-sections, it is shown that the proposed coupled framework leads to more cost-effective solutions (up to 20% less structural material) by using the more efficient CFS cross-sectional shapes optimised for generic applications. The results also indicate that optimising the frame geometry and knee brace configuration can noticeably improve the structural performance and reduce the required structural weight, especially when both ULS and SLS conditions are considered.

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Experimental study of cold-formed steel built-up columns

Cited by 64 publications

References 17 publications

Experimental Study of Cold-Formed Steel Built-Up Beams

Experimental Study of Cold-Formed Steel Built-Up Beams

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

Coupled element and structural level optimisation framework for cold-formed steel frames

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