Experimental and Numerical Verification of the Retrofitted RC Columns using FRP - A State of the Art Review

Externally bonded fiber reinforced polymers (FRP) in the form of wrapping the Reinforce Concrete (RC) columns are being deployed extensively throughout the world for retrofitting reinforced concrete structures. This paper presents the concise review for strengthening columns in civil engineering and modeling the response of retrofitted columns in softwares to predict their performance. Topics included verification of RC retrofitted columns using FRP wraps under test of centric and eccentric axial load in first. Then scrutinizing of the test has been extended for the test of RC retrofitted columns under cumulative and hysteric lateral load along with constant axial load. In next step, efforts to predict the behavior of mentioned columns numerically and analytically has been studied. In this regard, the stress strain behavior of confined column using FRP jackets has been considered while consequently flexural behavior of column could be extracted adopting new stress strain relationship of concrete confined by FRP. The paper is followed with a strong focus on studies, which have contributed to approach the experimental results to their modeling procedure to predict the behavior of strengthened column’s under centric and eccentric axial and also lateral load to interpret the variation of RC columns behavior after wrapping by FRP laminates. This practical performance has been conducted using various numbers of softwares in finite element and Nonfinite element modeling strategies.