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Beam-Column Tests of Cold-Formed Steel Built-Up Closed Sections
| 题名： | Beam-Column Tests of Cold-Formed Steel Built-Up Closed Sections |
| 正文语种： | eng |
| 作者： | Li, Qiu-Yun;Young, Ben |
| 作者单位： | Univ Hong Kong Dept Civil Engn Pokfulam Rd Hong Kong Peoples R China;Hong Kong Polytech Univ Dept Civil & Environm Engn Hong Kong Peoples R China |
| 关键词： | Beam-column tests;Built-up sections;Cold-formed steel;Distortional buckling;Failure mode;Flexural buckling;Local buckling;Strength predictions |
| 摘要： | This study aimed to investigate the buckling behavior of cold-formed steel built-up closed section members subjected to combined minor axis bending and compression. The channels were fabricated from zinc-coated steel sheets of grades G500 and G550 to compose built-up closed sections. A total of 30 beam-column specimens with nominal member lengths of 300, 900, and 1,500 mm as well as nominal plate thicknesses of 0.75 and 1.2 mm were eccentrically loaded under pin-ended boundary condition. The initial loading eccentricity was varied for the specimens in each test series to obtain the data evenly distributed in the axial load-moment interaction diagram. Experimental results including failure modes, loading capacities, and full-history responses of the test specimens were obtained. In addition, the experimental loading capacities were compared with nominal strengths to evaluate the suitability of the provisions as stipulated in the North American specification, Australian/New Zealand standard, European code, and American specification for the built-up section beam-columns. It is shown that the aforementioned design codes are overall unreliable and unconservative for strength predictions of the cold-formed steel built-up closed section members under combined minor axis bending and compression. |
| 出版年： | 2022 |
| 期刊名称： | Journal of structural engineering |
| 卷： | 148 |
| 期： | 4 |
| 页码： | 04022020.1-04022020.14 |
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