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Tests of cold-formed steel built-up open section members under eccentric compressive load
Abstract An experimental study was performed on cold-formed steel built-up open section members under eccentric compressive load. The specimens with member lengths varied from 300 to 1500 mm were manufactured by composing two identical channels using self-tapping screws. The channels with longitudinal stiffeners were fabricated from the steel grades G500 and G550 zinc-coated sheets with nominal 0.2% proof stresses of 500 and 550 MPa, respectively. A total of thirty-three combined minor axis bending and compression tests were carried out under pin-ended supports to explore the buckling behaviour of the newly designed built-up section members. Six test series with a relatively wide range of axial load-to-moment ratio were included in this study to examine the interaction relationship of the built-up section beam-columns. The test loading capacities, full-history responses and failure modes were obtained for all the test specimens. Since the novel built-up open sections are not covered in the current cold-formed steel design standards, the comparisons of experimental loading capacities with nominal strengths predicted by the North American Specification, Australian/New Zealand Standard, European Code and American Specification were conducted to assess the appropriateness of the existing design rules. The applicability of axial load-moment interactive formulae specified in the aforementioned design standards with the nominal pure compressive resistance and nominal pure bending resistance determined by direct strength method was evaluated for the built-up section beam-columns. It is found that the axial load-moment interactive formulae generally underestimate the strengths of the cold-formed steel built-up open section beam-columns.
Graphical abstract Display Omitted
Highlights Behaviour of cold-formed steel built-up open section beam-columns was investigated. Thirty-three eccentric compression tests were carried out under pin-ended boundary condition. The interaction between local, distortional and overall flexural buckling was observed in experiments. Assessment of existing design rules was performed through comparisons of test results. Suitability of current design codes was evaluated by conducting reliability analysis.
Tests of cold-formed steel built-up open section members under eccentric compressive load
Abstract An experimental study was performed on cold-formed steel built-up open section members under eccentric compressive load. The specimens with member lengths varied from 300 to 1500 mm were manufactured by composing two identical channels using self-tapping screws. The channels with longitudinal stiffeners were fabricated from the steel grades G500 and G550 zinc-coated sheets with nominal 0.2% proof stresses of 500 and 550 MPa, respectively. A total of thirty-three combined minor axis bending and compression tests were carried out under pin-ended supports to explore the buckling behaviour of the newly designed built-up section members. Six test series with a relatively wide range of axial load-to-moment ratio were included in this study to examine the interaction relationship of the built-up section beam-columns. The test loading capacities, full-history responses and failure modes were obtained for all the test specimens. Since the novel built-up open sections are not covered in the current cold-formed steel design standards, the comparisons of experimental loading capacities with nominal strengths predicted by the North American Specification, Australian/New Zealand Standard, European Code and American Specification were conducted to assess the appropriateness of the existing design rules. The applicability of axial load-moment interactive formulae specified in the aforementioned design standards with the nominal pure compressive resistance and nominal pure bending resistance determined by direct strength method was evaluated for the built-up section beam-columns. It is found that the axial load-moment interactive formulae generally underestimate the strengths of the cold-formed steel built-up open section beam-columns.
Graphical abstract Display Omitted
Highlights Behaviour of cold-formed steel built-up open section beam-columns was investigated. Thirty-three eccentric compression tests were carried out under pin-ended boundary condition. The interaction between local, distortional and overall flexural buckling was observed in experiments. Assessment of existing design rules was performed through comparisons of test results. Suitability of current design codes was evaluated by conducting reliability analysis.
Tests of cold-formed steel built-up open section members under eccentric compressive load
Li, Qiu-Yun (author) / Young, Ben (author)
2021-05-25
Article (Journal)
Electronic Resource
English
Compressive behavior of a novel cold-formed steel built-up box section: Tests, modelling and design
| Elsevier | 2025