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Buckling behavior of closed built-up cold-formed steel columns under compression
https://orcid.org/0000-0001-8590-5885
https://orcid.org/0000-0001-9399-104X
https://orcid.org/0000-0002-8342-3695
Abstract The versatility of cold-formed steel sections ensures the possibility of combining multiple individual sections forming built-up members with significantly higher load-bearing capacity. This paper reports detailed experimental, numerical and analytical research on closed built-up cold-formed steel columns with four different cross-section shapes under compression. Twelve experimental specimens were fabricated using individual C, U, and -shaped sections and connected using fasteners. The material characterization and imperfection measurements were also performed. The interaction between the different components and the influence of spacing between connectors was investigated for a relevant range of slendernesses using the finite element method, providing recommendations concerning the effective use of fasteners to attain composite action between the individual shapes. The overlapping plates tend to buckle simultaneously when the spacing is smaller than the local buckle half-wavelength. The suitability of the design codes, namely, Eurocode and North American design predictions, according to Effective Width Method (EWM) and Direct Strength Method (DSM), respectively, were assessed for the built-up members. Reliability analysis was undertaken, and it was observed that generally, the DSM with the modified slenderness ratio is the most reliable methodology.
Highlights Structural behaviour of innovative closed built-up short cold-formed steel columns under compression. Buckling phenomena of closed built-up cold-formed steel columns comprising C, and U channels. Influence of fastener spacing on the composite action between the individual elements, using numerical investigation. Reliability of design predictions according to the EN 1993-1-3 and AISI S100. Influence of the modified slenderness ratio.
Buckling behavior of closed built-up cold-formed steel columns under compression
https://orcid.org/0000-0001-8590-5885
https://orcid.org/0000-0001-9399-104X
https://orcid.org/0000-0002-8342-3695
Abstract The versatility of cold-formed steel sections ensures the possibility of combining multiple individual sections forming built-up members with significantly higher load-bearing capacity. This paper reports detailed experimental, numerical and analytical research on closed built-up cold-formed steel columns with four different cross-section shapes under compression. Twelve experimental specimens were fabricated using individual C, U, and -shaped sections and connected using fasteners. The material characterization and imperfection measurements were also performed. The interaction between the different components and the influence of spacing between connectors was investigated for a relevant range of slendernesses using the finite element method, providing recommendations concerning the effective use of fasteners to attain composite action between the individual shapes. The overlapping plates tend to buckle simultaneously when the spacing is smaller than the local buckle half-wavelength. The suitability of the design codes, namely, Eurocode and North American design predictions, according to Effective Width Method (EWM) and Direct Strength Method (DSM), respectively, were assessed for the built-up members. Reliability analysis was undertaken, and it was observed that generally, the DSM with the modified slenderness ratio is the most reliable methodology.
Highlights Structural behaviour of innovative closed built-up short cold-formed steel columns under compression. Buckling phenomena of closed built-up cold-formed steel columns comprising C, and U channels. Influence of fastener spacing on the composite action between the individual elements, using numerical investigation. Reliability of design predictions according to the EN 1993-1-3 and AISI S100. Influence of the modified slenderness ratio.
Buckling behavior of closed built-up cold-formed steel columns under compression
https://orcid.org/0000-0001-8590-5885
https://orcid.org/0000-0001-9399-104X
https://orcid.org/0000-0002-8342-3695
Abstract The versatility of cold-formed steel sections ensures the possibility of combining multiple individual sections forming built-up members with significantly higher load-bearing capacity. This paper reports detailed experimental, numerical and analytical research on closed built-up cold-formed steel columns with four different cross-section shapes under compression. Twelve experimental specimens were fabricated using individual C, U, and -shaped sections and connected using fasteners. The material characterization and imperfection measurements were also performed. The interaction between the different components and the influence of spacing between connectors was investigated for a relevant range of slendernesses using the finite element method, providing recommendations concerning the effective use of fasteners to attain composite action between the individual shapes. The overlapping plates tend to buckle simultaneously when the spacing is smaller than the local buckle half-wavelength. The suitability of the design codes, namely, Eurocode and North American design predictions, according to Effective Width Method (EWM) and Direct Strength Method (DSM), respectively, were assessed for the built-up members. Reliability analysis was undertaken, and it was observed that generally, the DSM with the modified slenderness ratio is the most reliable methodology.
Highlights Structural behaviour of innovative closed built-up short cold-formed steel columns under compression. Buckling phenomena of closed built-up cold-formed steel columns comprising C, and U channels. Influence of fastener spacing on the composite action between the individual elements, using numerical investigation. Reliability of design predictions according to the EN 1993-1-3 and AISI S100. Influence of the modified slenderness ratio.
Buckling behavior of closed built-up cold-formed steel columns under compression
Craveiro, Hélder D. (author) / Rahnavard, Rohola (author) / Laím, Luís (author) / Simões, Rui A. (author) / Santiago, Aldina (author)
Thin-Walled Structures ; 179
2022-05-19
Article (Journal)
Electronic Resource
English
Buckling behavior of closed built-up cold-formed steel columns under compression
| Elsevier | 2022
Closed built‐up cold‐formed steel columns under compression
| Wiley | 2023
Closed built‐up cold‐formed steel columns under compression
| Wiley | 2023