Experimental and numerical investigations on the axial capacity of cold-formed steel built-up box sections
| Autor: | Krishanu Roy, Hieng Ho Lau, Tina Chui Huon Ting, James B.P. Lim |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
business.product_category business.industry Metals and Alloys Truss 020101 civil engineering 02 engineering and technology Building and Construction Structural engineering Nonlinear finite element analysis Fastener Cold-formed steel 0201 civil engineering law.invention 020303 mechanical engineering & transports 0203 mechanical engineering Column (typography) Buckling Mechanics of Materials law Fe model business Civil and Structural Engineering Parametric statistics |
| Zdroj: | Journal of Constructional Steel Research. 160:411-427 |
| ISSN: | 0143-974X |
| Popis: | Built-up box sections are becoming increasingly popular for column members in cold-formed steel (CFS) construction; uses of such sections include CFS trusses, space frames, and portal frames. In this article, the built-up box sections are formed through two identical lipped channels connected at their flanges with self-drilling screws. In such an arrangement, independent buckling of the individual channels is prevented by the screws. This paper presents an experimental investigation on axial capacity of built-up CFS box sections. Tests were conducted for different values of slenderness from short to slender columns. In total, the results from 16 experimental tests are reported. Of these, 8 tests were conducted on built-up CFS box sections and the remaining 8 tests were conducted on single channel sections. Load-axial shortening relationship, and failure modes are discussed for built-up columns. Nonlinear finite element (FE) models were developed for built-up CFS box sections and single channels. FE models considered material nonlinearities, initial imperfections and modeling of intermediate fasteners. FE results showed good agreement against the test results. A parametric study was conducted which comprises 148 models to investigate the effect of fastener spacing on axial capacity of built-up CFS box sections. Both FE and test results were compared against the design strengths calculated in accordance with the American Iron and Steel Institute (AISI) and Australian and New Zealand Standards (AS/NZS). From the comparison, it was observed that the AISI & AS/NZS are conservative by around 17% while determining the axial capacity of such built-up CFS box columns. |
| Databáze: | OpenAIRE |
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