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Experimental study on cold-formed steel built-up section beam-columns experiencing non-uniform bending
Highlights Structural performance of cold-formed steel built-up section members under synchronous non-uniform bending and compression was investigated. Thirty-five beam-column tests under unequal end moments were conducted to examine the effect of moment gradients. Failure modes involving local, distortional and flexural buckling were found in the experiments. Comparisons of experimental loading capacities with nominal strengths were performed to evaluate existing design rules. Reliability analysis was performed to examine the appropriateness of current design codes.
Abstract The experimental study presented in this paper aimed to examine the performance of cold-formed steel built-up section beam-columns experiencing non-uniform bending. The test program was performed on built-up open and closed sections that were manufactured from steel grades G500 and G550 zinc-coated sheets. The test specimens were assembled by connecting two identical channels with discrete connectors along the longitudinal direction. Two member lengths and two plate thicknesses were considered for the test specimens to investigate the stability of the newly designed thin-walled section beam-columns. In total, thirty-five beam-column tests were carried out under pinned supports. The test results including loading capacity, failure mode and axial load-lateral deflection response were obtained and are fully reported in this paper. Moreover, the comparison of experimental loading capacities with nominal strengths was conducted to evaluate the applicability of the interaction curves specified in the North American Specification AISI S100, the Australian/New Zealand Standard AS/NZS 4600, the European Code EN 1993–1-1 and the American Specification ANSI/AISC 360 with nominal bending and compression resistances calculated by direct strength method for the thin-walled section beam-column members under moment gradients. Overall, these design methods were conservative for strength predictions of the built-up open section beam-column members under unequal end moments. For the built-up closed section members experiencing synchronous non-uniform bending and compression, the aforementioned design methods generally offered slightly conservative strength predictions, except for the interactive formula in the European Code with bending and compression resistances determined by direct strength method.
Experimental study on cold-formed steel built-up section beam-columns experiencing non-uniform bending
Highlights Structural performance of cold-formed steel built-up section members under synchronous non-uniform bending and compression was investigated. Thirty-five beam-column tests under unequal end moments were conducted to examine the effect of moment gradients. Failure modes involving local, distortional and flexural buckling were found in the experiments. Comparisons of experimental loading capacities with nominal strengths were performed to evaluate existing design rules. Reliability analysis was performed to examine the appropriateness of current design codes.
Abstract The experimental study presented in this paper aimed to examine the performance of cold-formed steel built-up section beam-columns experiencing non-uniform bending. The test program was performed on built-up open and closed sections that were manufactured from steel grades G500 and G550 zinc-coated sheets. The test specimens were assembled by connecting two identical channels with discrete connectors along the longitudinal direction. Two member lengths and two plate thicknesses were considered for the test specimens to investigate the stability of the newly designed thin-walled section beam-columns. In total, thirty-five beam-column tests were carried out under pinned supports. The test results including loading capacity, failure mode and axial load-lateral deflection response were obtained and are fully reported in this paper. Moreover, the comparison of experimental loading capacities with nominal strengths was conducted to evaluate the applicability of the interaction curves specified in the North American Specification AISI S100, the Australian/New Zealand Standard AS/NZS 4600, the European Code EN 1993–1-1 and the American Specification ANSI/AISC 360 with nominal bending and compression resistances calculated by direct strength method for the thin-walled section beam-column members under moment gradients. Overall, these design methods were conservative for strength predictions of the built-up open section beam-column members under unequal end moments. For the built-up closed section members experiencing synchronous non-uniform bending and compression, the aforementioned design methods generally offered slightly conservative strength predictions, except for the interactive formula in the European Code with bending and compression resistances determined by direct strength method.
Experimental study on cold-formed steel built-up section beam-columns experiencing non-uniform bending
Li, Qiu-Yun (author) / Young, Ben (author)
Engineering Structures ; 256
2022-01-25
Article (Journal)
Electronic Resource
English
Experimental investigation of built-up cold-formed steel section battened columns
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Experimental study of cold-formed steel built-up columns
| Elsevier | 2019