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

Article


Dogar, Attiq Ur Rahman, Ubaid Ur Rehman, Hafiz Muhammad, Tafsirojjaman, T. and Iqbal, Naveed. 2020. "Experimental investigations on inelastic behaviour and modified Gerber joint for double-span steel trapezoidal sheeting." Structures. 24, pp. 514-525. https://doi.org/10.1016/j.istruc.2020.01.042
Article Title

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

ERA Journal ID211389
Article CategoryArticle
AuthorsDogar, Attiq Ur Rahman (Author), Ubaid Ur Rehman, Hafiz Muhammad (Author), Tafsirojjaman, T. (Author) and Iqbal, Naveed (Author)
Journal TitleStructures
Journal Citation24, pp. 514-525
Number of Pages12
Year2020
PublisherElsevier
Place of PublicationNew York, United States
ISSN2352-0124
Digital Object Identifier (DOI)https://doi.org/10.1016/j.istruc.2020.01.042
Web Address (URL)https://www.sciencedirect.com/science/article/pii/S2352012420300424?via%3Dihub
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.

Keywordscold-formed steel, Direct Strength Method, Gerber joint, inelastic behaviour, moment redistribution, multi-span sheeting, post-elastic, trapezoidal sheeting
ANZSRC Field of Research 2020400510. Structural engineering
400599. Civil engineering not elsewhere classified
400504. Construction engineering
Public Notes

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Byline AffiliationsLulea University of Technology, Sweden
University of Coimbra, Portugal
Queensland University of Technology
Institution of OriginUniversity of Southern Queensland
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