This thesis presents a new computer simulation model that can accurately capture the hysteresis response behaviour of reinforced concrete shear walls repaired or strengthened with externally boned FRP sheets under the reversed cyclic loading of earthquakes. The proposed computer model can accurately simulate the IC debonding mechanism under the two-dimensional stress state of the wall panel and the subsequent ductile flexural or brittle shear failure modes of walls with different aspect ratios. Computer simulation results correlate well with experimental test results. The proposed computer model can accurately predict the hysteresis response behaviour, lateral load resisting strength, energy dissipation capacity and ductility performance of FRP repaired or strengthened shear walls in seismic applications.