STUDY ON THE COMPRESSIVE PERFORMANCE OF PLAIN-WOVEN FABRIC CONFINED CONCRETE COLUMNS

Abstract

FRP wrapping is a popular method for reinforcing concrete columns using fully and partially wrapping strengthening techniques. However, compared to the fully wrapped confinement mechanism, partially wrapped FRP columns in confined concrete are not well understood. This paper presents an experimental study on the axial compressive behavior of circular concrete columns partially wrapped with plain FRP fabric, with the aim of enhancing our understanding and optimization of FRP strengthening techniques. This study investigates the effects of four types of fiber-reinforced polymer (FRP) wraps and one concrete mix design on the axial behavior of FRP-confined concrete. The results indicated that the plain-woven fabric effectively improved the compressive stress and axial strain of the concrete columns. PWF-C displayed an increase of 70.96 % and 255.5%, compressive stress and axial strain compared to control specimen. PWF-G showed enhancements of 54.35% and 263.33% compared to the control specimen. The maximum improvement in compressive stress was observed for the hybrid plain-woven fabric (PWF-G-H), which was 84.72 % higher than that of the control specimen. Similarly, the maximum strain was observed for PWF-G, which was 263 % higher than that of the control specimen. The samples exhibited gradual cracking during loading, and the failure damage was mostly inclined along the warp direction of the fabric.