Stress-strain analytical model for FRP-confined concrete circular column

Abstract:

An analytical stress-strain model for concrete cylinders confined by fibre-reinforced polymer (FRP) was presented to accurately simulate the behavior of FRP-confined concrete under uniaxial compression.Based on large numbers of colleted test data,a new equation for predicting the ultimate compressive strength of FRPconfined concrete circular columns was suggested according to the octahedral theory,and an equation for calculating the ultimate compressive strain was also proposed by considering the lateral confining pressure.The full-range lateral-to-axial strain relationship for FRP-confined concrete circular columns was obtained by analyzing the stress-strain curves measured in tests.Then an analytical stress-strain model was generated via an incremental process,in which a stress-strain model for actively-confined concrete proposed by Mander was used as the basic model.It is found that the predicting results agree well with test data.