AXIAL COMPRESSIVE STRENGTH OF REINFORCED CONCRETE COLUMN STRENGTHENING WITH CFRP SUBJECTED TO CONCENTRIC LOADING

Abstract

This study was an experimental program on the behavior of reinforced concrete short columns confined with CFRP, which is subjected to concentric loading, and developed an equation to predict the axial compressive strength of the column. Four specimens with a size of 75 mm × 75 mm × 750 mm were made and tested. One specimen was the column without CFRP as a reference specimen, while the others were confined with one, two, and three layers of CFRP, respectively. Cylinder specimens were also made with a size of 300 mm × 150 mm to get the compressive strength. The Cylinder specimens were also made in 4 variations: first, without CFRP; second, wrapped with one layer; third, wrapped with two layers; and fourth, wrapped with three layers of CFRP. The results of column testing were compared with several models that have been proposed by previous researchers. The experimental results show that the compressive strength of a column without CFRP, with one CFRP layer, with two layers of CFRP, and with three layers of CFRP were 121372.12 N, 179402.36 N, 151895.64 N, and 210867.69 N, respectively. The comparison of the results of an experimental program with the model proposed by several researchers shows that the equation proposed by Toutanji was close to the results of this experimental study. Based on this model, the equation was developed and modified to predict the axial strength of the reinforced concrete column strengthened with CRFP subjected to concentric loading was proposed in this article.