Title: Concentric Loading of FRP Confined High Strength RC Columns

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Publication: CIA

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Date: 2/28/2011

Abstract:
An investigation was conducted to study the behaviour of Carbon Fibre Reinforced Polymers (CFRP) confined hollow reinforced concrete (RC) columns under concentric loading. The objective was to identify the load-deflection behaviour of CFRP confined hollow RC columns focusing on circular and rectangular column sections having different shape of hole. Twelve RC columns (height 925 mm) consisted of six circular columns having 205 mm diameter (two solid columns, two hollow columns with circular hole, and two hollow columns with square hole) and six square columns (two solid columns size 171 mm x 171 mm, two hollow columns size 182 mm x 182 mm with circular hole, and two hollow columns with square hole) were cast and tested. Six columns from each configuration were left unconfined as control specimens, while the others were confined with CFRP sheets. It was found that CFRP confinement in lateral direction increases the hollow RC columns’ axial load and deflection capacities. CFRP jackets prevent premature failure of concrete cover and buckling outwards of steel bars, leading to significant improved performance of CFRP concrete column composite. In this study, hollow columns having circular holes show better performance in maximum load and axial deflection carrying capacity, compared to hollow columns having square holes.