Welding Technologies for Built-Up Cold-Formed Steel Beams: Experimental Investigations

Ungureanu, Viorel; Both, Ioan; Grosan, Marius; Neagu, Călin; Dubina, Dan; Burcă, Mircea; Tunea, D.

doi:10.18057/icass2018.p.082

Cited by 9 publications

(12 citation statements)

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“…The length of 2.1 m should provide local and distortional behaviour while the length of 6 m should ensure a common length for beams in exploitation. Existing experimental curves have been used [1] in the analysis, with a yield stress fy = 430 N/mm 2 , see Fig. 4.…”

Section: Generalmentioning

confidence: 99%

“…Previous studies, considering appropriate imperfections, material parameters, mesh size and element type, have shown that finite element (FE) models can be used to accurately predict the load-bearing capacity and post-buckling behaviour of the built-up cold-formed steel beams [1,15].…”

Section: Preparation Of Numerical Modelsmentioning

confidence: 99%

“…Cold-formed steel back-to-back built-up steel beams are efficient and very attractive structural elements which, besides material savings and low self-weight, can also offer excellent efficiency in the production process. The connection between such built-up steel components can be easily obtained by bolts or screws, but the development of the welding processes also leads to the application of other solutions like continuous (laser or MIG brazing) or discrete (spot welding) [1]. The built-up structural elements made of coldformed steel profiles can be applied in structures, as components loaded in bending, axial force or combined loadings.…”

Section: Introductionmentioning

confidence: 99%

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Numerical study on bending resistance of cold‐formed steel back‐to‐back built‐up elements

Lukačević¹,

Ungureanu

Valčić

et al. 2021

ce papers

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Cold‐formed steel back‐to‐back built‐up beams are efficient and very attractive structural elements which can also offer excellent efficiency in production, both in capacity and material savings. The connection between such built‐up steel components can be easily obtained by screws or bolts, but the developments in the welding processes also lead to other solutions like continuous (laser or MIG brazing) or discrete (spot welding). This paper presents a parametric numerical study on such elements where various shapes and cross‐section geometries will be analysed, using different types of connection between the built‐up steel elements. The results from the evaluation of local and global buckling behaviour of such beams will serve as a base for planning future experimental work. Based on the numerical model, the paper presents the influence of several parameters i.e., the type of the channel section (lipped or plain channels), length of the beam, continuous and discrete connections between channels, the number and the distance between discrete connections along the beam axis and along the beam height. From the parametric study, it is concluded that capacity of the cold‐formed steel back‐to‐back built‐up steel beams is highly affected by the type of connections.

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Section: Generalmentioning

confidence: 99%

Section: Preparation Of Numerical Modelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical study on bending resistance of cold‐formed steel back‐to‐back built‐up elements

Lukačević¹,

Ungureanu

Valčić

et al. 2021

ce papers

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“…Since web openings are commonly used in industry, the well-formed solution was further developed to accommodate a web opening [40,41], which gave rise to additional design considerations. Web openings were used in the case where these members are used as secondary beams in floor systems.…”

Section: Introductionmentioning

confidence: 99%

Parametric Study on Built-Up Cold-Formed Steel Beams with Web Openings Connected by Spot Welding

Cristian

Ungureanu

2023

Buildings

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This paper presents a numerical parametric study on cold-formed steel built-up beams subjected to bending. The cold-formed steel built-up elements are efficient structural elements that are easy to assemble during the construction process, ensuring material savings and potential for standardization, thus making them more suitable for mass production. A new technological solution for built-up steel beams with webs made of corrugated steel sheets and flanges made of cold-formed steel profiles, assembled through two welding techniques, was proposed within the well-formed research project. This solution can be used as a component of single or low-rise multi-story frames, purlins, or secondary beams. The experimental program investigated seven full-scale beams, two of which have web openings. The web openings were introduced for the case when these members are used as secondary beams in floor systems. The paper investigates these types of beams with web openings using parametric numerical analyses. A numerical model validated against experimental tests was proposed to carry out a parametric study through nonlinear finite element analysis, considering initial imperfections and considering the strain-hardening characteristics of the steel components. The influence of different components was analyzed through the parametric study. Beams with three lengths were studied, i.e., (1) 6000 mm, (2) 7500 mm, and (3) 9000 mm. In total, 61 simulations were found. The article highlights the parameters that contribute significantly to the stiffness and capacity of the built-up cold-formed steel elements. The weakest component was concluded to be the thickness of the corrugated web, while the presence of the stiffened web opening reduced the bearing capacity by approximately 5–10%.

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“…The results showed that trapezoidal corrugated web had a maximum load capacity and that triangular web had a significant lateral displacement compared to other types of web. The main benefits of build-up corrugated web elements using fixed supports have already been summarised and demonstrated through research investigation on such types of beams connected using screws [18,19,22], spot welding (SW) and Cold Metal Transfer (CMT) techniques [23][24][25]. CMT, mainly developed in the last years, is a new connection technology for building steel structures.…”

mentioning

confidence: 99%

Parametric Finite Element Analyses of Lightweight Cold‐formed Steel‐concrete Composite Floor Beams

et al. 2022

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Composite structural systems have many benefits, such as a high degree of prefabrication, reusability and long span capability. The main advantage of such systems is manifested through the optimal utilisation of structural steel and concrete. Additionally, allowing for demountability and reusability, the system can also result in a much smaller carbon footprint at the end of life. These advantages are particularly emphasised with the implementation of cold‐formed steel sections. This paper presents an innovative solution for a composite floor structure system consisting of built‐up cold‐formed profiles and concrete slabs made with profiled sheets. The influence of the corrugated web thickness, type of connection between steel beam elements, the degree of shear connection and steel beam height on the overall behaviour of the composite system is analysed. The performed FE analyses showed that the influence of connections between steel beam elements and the degree of shear connection had the most significant impact on system behaviour. In contrast, the steel beam height, the corrugated web thickness and spot weld density had less influence on the analysed composite system behaviour. The obtained results provide the basis for implementing laboratory research on the proposed system.

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Welding Technologies for Built-Up Cold-Formed Steel Beams: Experimental Investigations

Cited by 9 publications

References 0 publications

Numerical study on bending resistance of cold‐formed steel back‐to‐back built‐up elements

Numerical study on bending resistance of cold‐formed steel back‐to‐back built‐up elements

Parametric Study on Built-Up Cold-Formed Steel Beams with Web Openings Connected by Spot Welding

Parametric Finite Element Analyses of Lightweight Cold‐formed Steel‐concrete Composite Floor Beams

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