Abstract:
Considering the strength grade of core concrete, reinforcement layer of fiber-reinforced polymer (FRP) textile, the axial compressive tests of concrete cylinders strengthened with FRP textile and engineered cementitious composites (ECC) were carried out to study the bearing capacity and deformation performance of the FRP-ECC confined cylinder. The test results show that the failure mode of most strengthened cylinders is the rupture of embedded FRP flexible textile. With the increase of reinforcement FRP textile layers, the strengthened columns’ ultimate bearing capacity and deformation performance are improved by 2%-35% and 77%-145%, respectively. With the increase of the strength grade of the core concrete, the increase range of the ultimate bearing capacity is gradually reduced. In addition, according to the test results and the stress-strain model of FRP confined concrete, the corresponding strength model and envelope stress-strain models of FRP-ECC confined cylinder are given. The analysis results show that the stress-strain curves predicted by these models match well with test results.