Axial Experiment on CFRP Confined Steel Reinforced Concrete Columns with Partial Deteriorated Strength

This paper aims to investigate the mechanical behavior of columns with partial deteriorated strength and to evaluate the availability of the partial confinement. Five steel reinforced concrete columns have been tested. Different layers of CFRP sheets have been wrapped on the deteriorated strength part. Columns are subjected to axial compression until failure. Axial load, and axial and transverse strains are measured to investigate confinement levels supplied by CFRP sheets. Experimental results indicate that both the load capacity and the ductility of the deteriorated strength part could be significantly increased, subsequently; the load capacity of the entire column can be enhanced higher than those of the original columns. An existing analytical model on FRP reinforcement is used to predict the ultimate load and to evaluate the improvement effectiveness of partial confinement. The prediction provided by theoretical model shows good agreement with the experimental results. Findings of this paper show that partial confinement on deteriorated parts of concrete columns would be developed as an alternative to diminish cost and time consumption in practice.