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Residual shear capacity of cold-formed steel-to-sheathing screwed connections at elevated temperatures

Residual shear capacity of cold-formed steel-to-sheathing screwed connections at elevated... Most previous thermal-mechanical modeling of cold-formed steel (CFS) walls did not consider the failure of screwed connections under fire conditions because of the limited data of such connections at elevated temperatures.Design/methodology/approachIn this study, 285 steady-state tests are conducted on CFS screwed connections with single-layer gypsum plasterboard (GPB) and Bolivian magnesium board (BMB) sheathing at ambient and elevated temperatures. The failure of these connections is described as the breaking of the loaded sheathing edge.FindingsFor the BMB sheathing screwed connections, hydrochloric acid gas is generated and released above 300°C, and the shear strength becomes much less than that of the GPB sheathing screwed connection above 370°C. Hence, BMB may not be suitable for use as the face-layer sheathing of CFS walls but is still recommended to replace GPB as the base-layer sheathing. The major influencing parameters on the shear strength of screwed connections are identified as the type of sheathing material and the loaded sheathing edge distance.Originality/valueBased on the previous and present test results, a unified expression for the residual shear strength of screwed connections with GPB and BMB is proposed at ambient and elevated temperatures with acceptable accuracy. It can be used as the basic input parameter of the numerical simulation of the CFS structures under fire conditions. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Structural Fire Engineering Emerald Publishing

Residual shear capacity of cold-formed steel-to-sheathing screwed connections at elevated temperatures

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References (24)

Publisher
Emerald Publishing
Copyright
© Emerald Publishing Limited
ISSN
2040-2317
DOI
10.1108/jsfe-07-2020-0024
Publisher site
See Article on Publisher Site

Abstract

Most previous thermal-mechanical modeling of cold-formed steel (CFS) walls did not consider the failure of screwed connections under fire conditions because of the limited data of such connections at elevated temperatures.Design/methodology/approachIn this study, 285 steady-state tests are conducted on CFS screwed connections with single-layer gypsum plasterboard (GPB) and Bolivian magnesium board (BMB) sheathing at ambient and elevated temperatures. The failure of these connections is described as the breaking of the loaded sheathing edge.FindingsFor the BMB sheathing screwed connections, hydrochloric acid gas is generated and released above 300°C, and the shear strength becomes much less than that of the GPB sheathing screwed connection above 370°C. Hence, BMB may not be suitable for use as the face-layer sheathing of CFS walls but is still recommended to replace GPB as the base-layer sheathing. The major influencing parameters on the shear strength of screwed connections are identified as the type of sheathing material and the loaded sheathing edge distance.Originality/valueBased on the previous and present test results, a unified expression for the residual shear strength of screwed connections with GPB and BMB is proposed at ambient and elevated temperatures with acceptable accuracy. It can be used as the basic input parameter of the numerical simulation of the CFS structures under fire conditions.

Journal

Journal of Structural Fire Engineering – Emerald Publishing

Published: May 24, 2021

Keywords: Elevated temperatures; Screwed connection; Bolivian magnesium board; Gypsum plasterboard; Influencing parameters; Unified prediction expression

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