Reinforcement schemes for cold-formed steel joists with a large web opening in shear zone—An experimental investigation |
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| Affiliation: | 1. Structural Engineer, Stantec Consulting Ltd, 7070 Mississauga Road, Mississauga, ON, Canada L5N 7G2;2. Department of Civil Engineering, McMaster University, Hamilton, ON, Canada L8S 4L7;3. Department of Civil Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong, China;1. Department of Engineering Mechanics and Innovation Center for Advanced Ship and Deep-Sea Exploration, School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;2. School of Mechanical Engineering, Anhui Science and Technology University, Chuzhou 233100, Anhui, China;1. School of Civil and Environmental Engineering, Harbin Institute of Technology, Shenzhen 518055, China;2. School of Civil Engineering, Hefei University of Technology, Hefei 230009, China;3. Hefei Gas Group Co., Ltd., Hefei 230075, China;4. College of Civil Engineering, Shenzhen University, Shenzhen 518060, China;1. Department of Civil and Environmental Engineering, Imperial College London, London SW7 2AZ, United Kingdom;1. School of Civil and Hydraulic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;2. School of Civil and Hydraulic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;3. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China |
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| Abstract: | The floor joists of cold-formed steel (CFS) structures often require large web openings. Reinforcement of such openings may mitigate the detrimental effects arising from such web openings. This paper is based on an experimental investigation conducted to establish reinforcement schemes for CFS joists with a large web opening located in high shear zones. The investigation considered a large web opening cut out in the middle of the web of a lipped channel section. Circular and square large web openings of about 65% web depth were considered. The shear tests involved short span specimens, simply supported at the ends, and subjected to a mid-span point load. This paper presents the experimental set-up, and the test results associated with 27 individual tests consisting of nine sets of three identical tests. These test sets consist of cold-formed steel joists sections with (a) no web opening, (b) webs having circular or square openings, (c) webs having reinforced openings. Three different reinforcement schemes were investigated, however, the test results indicated that the proposed “Vierendeel truss type reinforcement scheme” can restore the original shear strength of such sections having circular or square openings. Overall, this study establishes a cost-effective reinforcement scheme for cold-formed steel joists having a large web opening in high shear zone. |
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| Keywords: | Cold-formed steel Floor joists Shear resistance Web openings Reinforcements Experiments |
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