| Download | - View accepted manuscript: Loadbearing capacity of cold formed steel joists subjected to severe heating (PDF, 321 KiB)
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| Author | Search for: Alfawakhiri, F.1; Search for: Sultan, M. A.1 |
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| Affiliation | - National Research Council of Canada. NRC Institute for Research in Construction
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| Format | Text, Article |
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| Conference | Interflam 2001, 9th International Fire Science & Engineering Conference, September 17-19, 2001, Edinburgh, Scotland, UK |
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| Subject | Floors; Fire; cold formed steel; joist; fire resistance |
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| Abstract | This paper discusses the behaviour of lightweight steel framed (LSF) unrestrained floors, protected with gypsum board ceilings, in five standard fire resistance tests. Parameters investigated in this test series were joist spacing, number of gypsum board layers in the ceiling membrane, floor cavity insulation and presence of concrete topping in the sub-floor. The fire resistance of LSF floors appears to be essentially governed by the ability of gypsum board to remain in place under fire exposure; other factors are of secondary importance.Retrospective numerical thermal-structural simulations of these tests show good agreement with measured temperature and deformation histories. The development of floor deflections is governed by the thermal bowing of steel joists except for the last one or two minutes in the tests, when 'run-away' deformations develop due to the formation of inelastic hinges near mid-span. Evaluation of bending moment resistance of heated joists using current design provisions for cold formed steel structures, adjusted to account for the deterioration of strength and stiffness of steel at elevated temperatures, leads to conservative and fairlyaccurate predictions of fire resistance. |
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| Publication date | 2001-10-01 |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| NRC number | NRCC 45009
NRC-IRC-10383 |
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| NPARC number | 20378886 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | 08f7a689-187f-45d2-85d1-85e9b62d1c75 |
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| Record created | 2012-07-24 |
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| Record modified | 2020-03-27 |
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