Experimental Work on Columns Confined with CFRP Sheets

Concrete behaves superiorly when confined, so columns are confined and studied their behavior. Plain control concrete column 6no’s, reinforced column with a minimum longitudinal steel 0.8% of cross section 6no’s and 18no’s plain confined column with one, two and three layers of CFRP in transverse direction for different grades of concrete. The axial load –Shortening, load carrying capacity, ductility index, toughness index, and failure pattern of each specimen are studied. Results of the experimental program showed that concrete confined with CFRP transversely increases load carrying capacity effectively increases up to the two layers , whereas ductility increases up to the three layers of confinement as compared to control concrete . Toughness index of the strengthened column increases with increase in grade of concrete, increases with increasing the number of CFRP sheet layers.