Numerical Study on the Applicability of Design-Oriented Models of FRP-Confined Concrete for Predicting the Cyclic Response of Circular FRP-Jacketed RC Columns

Abstract

This study examined the accuracy of 14 design-oriented stress-strain models of fiber-reinforced polymer (FRP)-confined concrete from the available literature to predict the cyclic responses of nine circular reinforced concrete (RC) columns. The examined columns were externally wrapped with FRP composites and subjected to both constant axial loading and cyclic lateral loading. All of the studied stress-strain models were implemented in analysis software as a new uniaxial material. The numerical test results showed that the general response of an FRP-confined RC column to cyclic loading could be predicted using design-oriented stress-strain models; however, the local stress-strain law obtained from concentric compression tests did not reflect very well the local behavior of the compression zone of members in flexure with axial force. The higher the column axial load ratio, the lower the ratio between the numerical and experimental ultimate column lateral displacements, and thus, the predicted failure mode does not match well with the experimental results.