Compressive strength of reinforced concrete column confined by composite material

Abstract

Thus study has two parts. The first describes experiments and the second presents a model to accurately predict the compressive strength of concrete columns confined by composite materials. FRP is wrapped around concrete columns and RC columns to determine the difference between their behaviors under uniaxial compression. Experimental results indicate that the FRP confinements of the two specimen types are similar. Accordingly, a method for analyzing the behavior of an FRP-wrapped concrete column can be used also to analyze that of an FRP-wrapped RC column. When an RC column takes a uniaxial load, the concrete is first shear-fractured. Then, the steel is buckled and finally the FRP breaks. Confinement using FRP is a good ideal because FRP can be wrapped all around an RC column. Its stress–strain plot is bilinear. This study presents a theoretical stress–strain model. Some comparisons between experimental stress and the stress predicted using a model indicate that the present model is good to predict the fracture stress of FRP-wrapped concrete column.