The mechanics of built-up cold-formed steel members

Rasmussen, Kim J.R.; Khezri, Mani; Schafer, Benjamin W.; Zhang, Hao

doi:10.1016/j.tws.2020.106756

Cited by 60 publications

(26 citation statements)

References 20 publications

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“…▪ Table 8 and Figure 10 show that EFGs have a relevant positive effect on the behavior of built-up sections [Fratamico et al 2018;Rasmussen et al 2020]. The increase in buckling loads can be up to 25% and 50% for the back-to-back and pack-4 configurations, respectively.…”

Section: Gbt Approachmentioning

confidence: 98%

“…However, it is considered to be unpractical for daily design of this type of structures. Alternatively, various practical methodologies for determining the buckling loads have been recently developed, such as the compound Finite Strip Method [Abbasi 2018; Akshay 2021] or the effective rigidity approach [Rasmussen et al 2020;Phan et al 2021;Phan et al 2022]. In the present study, GBT is applied because it allows the numerical model to be created as quickly as with the FSM and, at the same time, explicitly account for discrete fasteners as in FEM.…”

Section: Gbt Approachmentioning

confidence: 99%

“…Furthermore, GBT is also used herein to assess the effectiveness of EFGs (End Fastener Groups), which consist of two columns of 8 screws at each end section. The study of this effect cannot be tackled with standard FSM [Fratamico, Schafer 2014;Rasmussen et al 2020].…”

Section: Gbt Approachmentioning

confidence: 99%

“…It is noted that considering fully composite action may lead to an overestimation of the member buckling load. The accuracy of hand calculations for global buckling of built-up columns can be improved by using the formulation recently developed in[Rasmussen et al 2020;Phan et al 2021;Phan et al 2022]. However, in the present study it was preferred to move to numerical methodologies, i.e., FSM and GBT (see subsections 7.4.2 and 7.4.3).…”

mentioning

confidence: 99%

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Customary light-gauge steel framing construction with flat strap bracing. Seismicity limits for short to mid-rise buildings in Europe

GRANADOS

Casafont

Bové

et al. 2023

Preprint

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Ordinary (customary) light gauge steel framing is a convenient construction technology; however, given the studs low axial capacity, has been mainly considered for short buildings in low seismicity regions. This paper investigates the bounds of this type of steel framing (in moderate and high seismicity areas) by designing the structures of three representative 5, 7 and 10-story buildings in order to examine their feasibility. The necessity of using built-up columns consisting of two or more sections is observed. The axial capacity of studs is estimated by code-type analyses. The critical buckling stress is determined with well-known closed-form expressions; as they do not contemplate the flexibility of the screwed connections (in built-up sections), the obtained results are complemented with those of Finite Strip Method and Generalized Beam Theory formulations.

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Section: Gbt Approachmentioning

confidence: 98%

Section: Gbt Approachmentioning

confidence: 99%

Section: Gbt Approachmentioning

confidence: 99%

mentioning

confidence: 99%

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Customary light-gauge steel framing construction with flat strap bracing. Seismicity limits for short to mid-rise buildings in Europe

GRANADOS

Casafont

Bové

et al. 2023

Preprint

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show abstract

“…e methods in China and AISI S100-16 were found to be conservative for calculating the eccentric axial compression strengths of these built-up double-box columns. e closed form solution of buckling load for the built-up sections was provided by Rasmussen et al [26].…”

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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Structural behaviour of built‐up battened cold‐formed steel columns

Craveiro,

Rahnavard,

Santiago

et al. 2023

ce papers

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Built‐up cold‐formed steel (CFS) columns are extensively used when single cold‐formed steel elements are not able to fulfill the established requirements in terms of load‐bearing capacity. For hot‐rolled steel laced and battened columns, the EN 1993‐1‐1 presents specific design provisions. However, no specific design guidelines are provided for CFS laced and battened columns. The investigation on this type of built‐up elements is scarce, requiring extensive research to assess if the hot‐rolled design methodologies are also suitable for cold‐formed steel elements. In this investigation, experimental and numerical results are presented for CFS battened columns comprising C and Σ channels. Assessing the composite action between the individual shapes connected by the batten plates was one of the objectives of this investigation. The predominant buckling modes were analyzed considering the influence of batten plate spacing and the number of fasteners per plate. Based on the obtained experimental results finite element models were developed to further assess the influence of key governing parameters. The observed axial strengths are compared with design strengths determined according to the Eurocode assessing the suitability of the design methodologies.

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The mechanics of built-up cold-formed steel members

Cited by 60 publications

References 20 publications

Customary light-gauge steel framing construction with flat strap bracing. Seismicity limits for short to mid-rise buildings in Europe

Customary light-gauge steel framing construction with flat strap bracing. Seismicity limits for short to mid-rise buildings in Europe

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

Structural behaviour of built‐up battened cold‐formed steel columns

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