Experimental Study on Stress-Strain Relationship of Confined Concrete with GFRP Jackets

Abstract

A two-stage analytical model for evaluating the stress-strain behavior of square concrete columns confined with glass fiber-reinforced polymer (GFRP) is proposed. Fifty-one square columns (divided into seventeen groups) were tested under static axial compression up to failure. The main factors considered in the test are as follows: grades of concrete, bonding shape, amounts of GFRP jackets, and space of fiber strips. The results clearly showed the efficiency of the GFRP jackets in enhancing the ultimate strain and the strength of the columns. The analytical model was calibrated using data from the tests, and good agreement between test and computation results was obtained.