Experimental investigations on inelastic behaviour and modified Gerber joint for double-span steel trapezoidal sheeting

Dogar, Attiq Ur Rahman and Ubaid Ur Rehman, Hafiz Muhammad and Tafsirojjaman, T. ORCID: https://orcid.org/0000-0002-4801-6744 and Iqbal, Naveed (2020) Experimental investigations on inelastic behaviour and modified Gerber joint for double-span steel trapezoidal sheeting. Structures, 24. pp. 514-525.

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Abstract

Cold-formed steel trapezoidal profiles provide efficient solutions for roofing and often use the Gerber joint to effectively utilize capacities. The previous design of Gerber joint was sensitive to uneven distribution of loads and accidental loads, which imposed bending moments in the joint and lead to its failure. In this experimental program, the design of Gerber joint has been modified to work as a hinge under service loads and carry moments in accidental conditions. Also, the design of CFS is based on elastic methods that underestimate their capacity, especially for multi-span systems. Full-scale tests were conducted on highly stiffened double-span trapezoidal sheeting profiles with modified Gerber joint to investigate elastic capacity, inelastic behaviour, moment redistribution in the post-elastic phase, ultimate load capacity and feasibility of modified Gerber joint. Comparison of elastic load capacity with EWM and DSM predictions revealed that EWM design predictions were conservative by 30% while DSM predictions were accurate. For multi-span application, residual moment capacity ratios of 0.76 and 0.81 in the post-elastic phase allowed for moment redistribution and increased ultimate load capacity by 7.14% and 8.80% for 0.85 mm and 1 mm thick profiles respectively. Performance of modified Gerber joint to behave as a hinge under service loads and as continuous in the post-elastic phase was also found to be satisfactory. The study concluded that the economy in design and capacity utilization of multi-span CFS profiles can be improved by allowing for moment redistribution and using the modified Gerber joint.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Submitted Version deposited in accordance with the copyright policy of the publisher.
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 02 Aug 2021 03:18
Last Modified: 09 Sep 2021 04:53
Uncontrolled Keywords: cold-formed steel, Direct Strength Method, Gerber joint, inelastic behaviour, moment redistribution, multi-span sheeting, post-elastic, trapezoidal sheeting
Fields of Research (2008): 09 Engineering > 0905 Civil Engineering > 090503 Construction Materials
09 Engineering > 0905 Civil Engineering > 090506 Structural Engineering
09 Engineering > 0905 Civil Engineering > 090599 Civil Engineering not elsewhere classified
Fields of Research (2020): 40 ENGINEERING > 4005 Civil engineering > 400510 Structural engineering
40 ENGINEERING > 4005 Civil engineering > 400599 Civil engineering not elsewhere classified
40 ENGINEERING > 4005 Civil engineering > 400504 Construction engineering
Identification Number or DOI: https://doi.org/10.1016/j.istruc.2020.01.042
URI: http://eprints.usq.edu.au/id/eprint/42063

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