Finite Element Modeling of Cyclic Behavior of Shear Wall Structure Retrofitted using GFRP

Synopsis: In this paper, a non-linear 3-D finite element analysis (FEA) model using ABAQUS (Hibbit, Karlsson and Sorensen, Inc. 2003) was developed to predict the cyclic behavior of shear wall structures. In this FEA model, SPRING element is used to simulate the constraint deformation due to fiber reinforced polymer (FRP) wrapping, and improved concrete stress-strain curve is considered to account for the improvement of strength and ductility of concrete under FRP confinement. A damaged plasticity-based concrete model is used to capture the behavior of concrete under cyclic loading. Method to identify shear failure due to FRP debonding and FRP rupture in FEA is also proposed. The model is validated using the results from the experimental study. It is shown that the proposed model can predict the shear failure and cyclic hysteresis behavior of GFRP-wrapped shear wall reasonably well.