Experimental Study on the Shear Strengthening Effect of Cracked or Uncracked RC Columns with Carbon Fiber Sheets

균열 및 비균열 철근콘크리트 기둥의 탄소섬유시트 전단보강효과에 관한 실험적 연구

This study investigates the structural behavior of cracked or uncracked RC columns retrofitted with CFS and evaluates the shear retrofit performance through experiment. Experimental works were conducted for sixth specimens varied in the adhesion method of CFS, the ratio of shear reinforcement bar, and the existence of crack before retrofitting. Throughout cyclic test, the strength, stiffness, failure modes, and ductility are discussed. The test results show that the retrofitting method with CFS improve the shear strength and ductility. The crack width below 2mm, occurred before retrofitting, didn't reduce the shear strengthening effect.