Review the Behavior of eccentrically loaded RC Columns Strengthened using CFRP Bars and Sheet

Abstract

This literature review highlights the use of Fiber-Reinforced Polymer (FRP) composites to strengthen reinforced concrete (RC) columns under various loading conditions. It focuses on two main methods: near-surface mounted (NSM) FRP reinforcement and external FRP confinement, often used in combination.

Key findings indicate that NSM FRP enhances flexural capacity and seismic performance, particularly under eccentric and biaxial loads. In contrast, external FRP confinement improves axial load capacity but is less effective with increasing eccentricity.

Hybrid systems, which integrate NSM FRP and external wraps, effectively mitigate debonding and buckling, enhancing strength and deformation capacity. The review also mentions analytical models that predict the behavior of FRP-strengthened columns. Applications of these methods include corroded, fire-damaged, or seismically challenged columns, confirming FRP composites as a valuable solution for reinforcing concrete structures.