Experimental and numerical investigations of high-strength cold-formed steel multi-limb built-up section columns
This paper investigates the buckling behaviour and load-carrying capacity of G550 high-strength cold-formed steel multi-limb built-up section columns under axial compression. Each built-up section consists of multiple lipped and unlipped channel sections connected by self-tapping screws. The C3U1 se...
| Main Authors: | , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/180215 |
| _version_ | 1811681458780110848 |
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| author | Ma, Chicheng Wei, Chenyang Jiang, Ke Zhao, Ou Su, Andi |
| author2 | School of Civil and Environmental Engineering |
| author_facet | School of Civil and Environmental Engineering Ma, Chicheng Wei, Chenyang Jiang, Ke Zhao, Ou Su, Andi |
| author_sort | Ma, Chicheng |
| collection | NTU |
| description | This paper investigates the buckling behaviour and load-carrying capacity of G550 high-strength cold-formed steel multi-limb built-up section columns under axial compression. Each built-up section consists of multiple lipped and unlipped channel sections connected by self-tapping screws. The C3U1 section is formed by three C-sections (i.e. lipped channel section) and one U-section (i.e. unlipped channel section), while the C2U2 section is formed by two C-sections and two U-sections. The experimental programme involved tensile coupon tests, measurements of initial geometrical imperfection, and column tests on ten C3U1 and ten C2U2 multi-limb built-up section columns. The numerical modelling programme was then performed, with the nonlinear finite element models created and validated against the experimental results. The applicability of the codified Effective Width Method and Direct Strength Method for predicting the strengths of G550 high-strength cold-formed steel multi-limb built-up section columns, as specified in the American Specification and Australian Standard, was then evaluated. The evaluation results showed that the codified Effective Width Method led to rather conservative and less accurate failure load predictions for G550 high-strength cold-formed steel multi-limb built-up section columns, while the codified Direct Strength Method provided accurate and consistent failure load predictions and thus applicable to the design of G550 high-strength cold-formed steel multi-limb built-up section columns. Concerning the lack of design guidelines specifically for multi-limb built-up sections, a modified Direct Strength Method was thus proposed as an alternative design method and shown to provide accurate failure load predictions. |
| first_indexed | 2024-10-01T03:41:16Z |
| format | Journal Article |
| id | ntu-10356/180215 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T03:41:16Z |
| publishDate | 2024 |
| record_format | dspace |
| spelling | ntu-10356/1802152024-09-24T04:43:44Z Experimental and numerical investigations of high-strength cold-formed steel multi-limb built-up section columns Ma, Chicheng Wei, Chenyang Jiang, Ke Zhao, Ou Su, Andi School of Civil and Environmental Engineering Engineering Compression tests Direct Strength Method This paper investigates the buckling behaviour and load-carrying capacity of G550 high-strength cold-formed steel multi-limb built-up section columns under axial compression. Each built-up section consists of multiple lipped and unlipped channel sections connected by self-tapping screws. The C3U1 section is formed by three C-sections (i.e. lipped channel section) and one U-section (i.e. unlipped channel section), while the C2U2 section is formed by two C-sections and two U-sections. The experimental programme involved tensile coupon tests, measurements of initial geometrical imperfection, and column tests on ten C3U1 and ten C2U2 multi-limb built-up section columns. The numerical modelling programme was then performed, with the nonlinear finite element models created and validated against the experimental results. The applicability of the codified Effective Width Method and Direct Strength Method for predicting the strengths of G550 high-strength cold-formed steel multi-limb built-up section columns, as specified in the American Specification and Australian Standard, was then evaluated. The evaluation results showed that the codified Effective Width Method led to rather conservative and less accurate failure load predictions for G550 high-strength cold-formed steel multi-limb built-up section columns, while the codified Direct Strength Method provided accurate and consistent failure load predictions and thus applicable to the design of G550 high-strength cold-formed steel multi-limb built-up section columns. Concerning the lack of design guidelines specifically for multi-limb built-up sections, a modified Direct Strength Method was thus proposed as an alternative design method and shown to provide accurate failure load predictions. The research carried out and described in this paper was supported by the National Natural Science Foundation of China (No. 52308163). 2024-09-24T04:43:43Z 2024-09-24T04:43:43Z 2024 Journal Article Ma, C., Wei, C., Jiang, K., Zhao, O. & Su, A. (2024). Experimental and numerical investigations of high-strength cold-formed steel multi-limb built-up section columns. Engineering Structures, 309, 118012-. https://dx.doi.org/10.1016/j.engstruct.2024.118012 0141-0296 https://hdl.handle.net/10356/180215 10.1016/j.engstruct.2024.118012 2-s2.0-85191196353 309 118012 en Engineering Structures © 2024 Elsevier Ltd. All rights reserved. |
| spellingShingle | Engineering Compression tests Direct Strength Method Ma, Chicheng Wei, Chenyang Jiang, Ke Zhao, Ou Su, Andi Experimental and numerical investigations of high-strength cold-formed steel multi-limb built-up section columns |
| title | Experimental and numerical investigations of high-strength cold-formed steel multi-limb built-up section columns |
| title_full | Experimental and numerical investigations of high-strength cold-formed steel multi-limb built-up section columns |
| title_fullStr | Experimental and numerical investigations of high-strength cold-formed steel multi-limb built-up section columns |
| title_full_unstemmed | Experimental and numerical investigations of high-strength cold-formed steel multi-limb built-up section columns |
| title_short | Experimental and numerical investigations of high-strength cold-formed steel multi-limb built-up section columns |
| title_sort | experimental and numerical investigations of high strength cold formed steel multi limb built up section columns |
| topic | Engineering Compression tests Direct Strength Method |
| url | https://hdl.handle.net/10356/180215 |
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