INVESTIGATION ON BEHAVIOUR OF SQUARE/RECTANGULAR REINFORCED CONCRETE COLUMNS RETROFITTED WITH FRP JACKET

摘要

The behaviour of fibre reinforced polymer (FRP)-wrapped concrete in circular columns has been extensively studied; however, much less is known about concrete in FRP-confined square/rectangular columns, in which the concrete is non-uniformly confined and the effectiveness of confinement is considerably reduced. This article presents the results of the numerical analysis of square/rectangular reinforced concrete (RC) columns confined with FRP jackets. Two prisms of size 250x250x500 mm and 150x300x500 mm were modelled and analysis was carried out using a non-linear finite element method. Two parameters of wrap thickness and fibre orientation were considered. The finite element analysis results were in good agreement with experimental data presented by other researchers. The numerical analysis results demonstrated significant enhancement in the compressive strength and ductility of the FRP-wrapped square/rectangular RC columns compared to unconfined RC columns. It was observed that the behaviour of the columns was greatly affected by the analysis parameters.