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Compared to other rehabilitation techniques, the use of externally bonded Fibre Reinforced Polymers (FRP) sheets for repair of damaged and strengthening of deficient reinforced concrete (RC) structures has gained increasing acceptance as a viable alternative especially in rapid repair application or as a less disruptive rehabilitation strategy. In previous studies of FRP retrofit applications, the focus has been directed mainly on the retrofit of one-dimensional structural elements of beams and columns. In the present study, seismic retrofit of two-dimensional structural element of shear wall using FRP sheets is investigated. An important component in the failure mechanism of RC shear wall retrofitted with FRP sheets is the separation or debonding of the FRP sheets from the concrete wall surface during seismic responses. After the occurrence of concrete cracking in a shear wall under the reversed loading actions of an earthquake, it is observed that debonding of the FRP sheet from the concrete substrate spreads quickly reducing its lateral load resisting capacity. The interaction behaviour between the performance of the FRP and the concrete cracking behaviour is known as Intermediate Crack (IC) debonding mechanism. Although previously developed models are able to account for the debonding of FRP in onedimensional beam members, they are unable to predict the behaviour of two-dimensional shear dominated shear wall components. This paper 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 twodimensional 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.

Modelling of debonding mechanisms in externally bonded FRP sheets in RC shear walls for earthquake resistance