Improvements in AISI Design Methods for Gypsum-Sheathed Cold-Formed Steel Wall Panels Subjected to Bending
Publication: Journal of Structural Engineering
Volume 145, Issue 2
Abstract
The objective of this investigation is to develop design rules for gypsum-sheathed cold-formed steel (CFS) members subjected to bending (out-of-plane). The parameters studied include the slenderness of the CFS stud and different sheathing configurations (sheathing thickness and fastener spacing). A comprehensive analytical study on the stiffnesses offered by the sheathing to the CFS panel was conducted for use in design equations. Three different combinations of stiffnesses offered by the sheathing were examined based on the failure modes and ultimate moment capacities obtained from the experimental results. The experimental results were compared with the predicted design strengths using the current design approach available from the American Iron and Steel Institute (AISI). The deficiency of the current design approach is highlighted, and a modified approach for incorporating the stiffnesses offered by the sheathing in the elastic buckling analysis is presented. The design strengths predicted using the modified approach on stiffness selection showed good agreement with the ultimate moments obtained from the experiments. A performed reliability analysis indicated that the modified design approach presented in this work can be used for the design of gypsum-sheathed cold-formed steel members subjected to bending (out-of-plane). A detailed design example for the sheathed CFS panel based on each design approach used in this work has been presented in the form of a table for more clarity.
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Acknowledgments
The investigation reported in this paper was funded by Science Engineering and Research Board (SERB) Research Grant (SB/S3/CEE/046/2014) from the Department of Science and Technology (DST), Government of India. The first author would like to acknowledge the financial assistance received from this project. The authors would also like to gratefully acknowledge Pennar Engineered Building Systems Ltd., Hyderabad, for their help in fabricating the test specimens required for experimental investigation.
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Published In
Journal of Structural Engineering
Volume 145 • Issue 2 • February 2019
Copyright
©2018 American Society of Civil Engineers.
History
Received: Jan 20, 2018
Accepted: Jun 15, 2018
Published online: Nov 27, 2018
Published in print: Feb 1, 2019
Discussion open until: Apr 27, 2019
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