Effect of natural latex wrapping layers on the strength, ductility and energy dissipation of cold-formed steel columns under cyclic lateral loading
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Institution: Dr. M.G.R. Educational and Research Institute
Department: Department of Civil Engineering
City: Chennai
Country: India
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V SARANYA
Institution: Dr. M.G.R. Educational and Research Institute
Department: Department of Civil Engineering
City: Chennai
Country: India
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ABSTRACT
This paper presents an experimental investigation into the effect of the number of natural latex wrapping layers on the cyclic lateral load behaviour of cold-formed steel (CFS) columns. Six distinct cross-sectional configurations — open channel section (CFS-CS), channel section with interior lip (CFS-CWLI), channel section with exterior lip (CFS-CWLE), back-to-back channel section (CFS-BBC), back-to-back channel with interior lip (CFS-BBC(WLI)), and back-to-back channel with exterior lip (CFS-BBC(WLE)) — were fabricated from 200×100×3 mm steel sheets and tested under cyclic lateral loading. Three groups of specimens were prepared: unwrapped (0 layers), single-layer latex wrapped (1 layer), and double-layer latex wrapped (2 layers). The specimens were subjected to cyclic lateral loads with 0.5 kN increments per cycle until failure. The lateral displacement, energy absorption index, ductility factor, and failure displacement were recorded and analysed. The results indicate that increasing the number of latex wrapping layers progressively improves the energy absorption capacity, with increases of up to 67% observed for the open channel section between the unwrapped and two-layer wrapped specimens. The ductility factor also generally increased with additional latex layers, particularly for back-to-back sections with exterior lips. All specimens failed in local buckling, and the mode of buckling was found to depend on the cross-sectional configuration. The study demonstrates that naturally available latex sheet is an effective strengthening material for CFS columns subjected to lateral cyclic loading, and is expected to be economical based on its known material characteristics, although a formal cost, durability and environmental assessment was outside the scope of this work. Each section–layer combination was represented by a single specimen, so the reported percentage improvements should be read as indicative trends rather than statistically validated averages.