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Seismic Rehabilitation of RC Beam-Column Joints Using FRPs
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RC frames, when subjected to earthquake, must§dissipate large amounts of energy. This can be§achieved when the beam-column joints are designed in§such a way that the plastic hinges form at a distance§away from the column and the joint region remains§elastic. In existing frames, a practical way to§implement this behaviour is to use FRPs. In this§study, two plain scaled-down sub-assemblies and five§retrofitted/repaired specimens using a new technique§called web-bonded FRP were tested under§monotonic/cyclic loads. It was concluded that the use§of FRPs can restore/upgrade the integrity of the§joint, keeping/improving its strength, stiffness and§ductility, and can relocate the plastic hinges away§from the column. An analytical model was developed to§calculate the ultimate moment capacity of the§web-bonded FRP sections considering FRP rupture and§tension failure modes. Design charts were also§developed for use by practicing engineers. All§specimens were then analysed by nonlinear finite§element software ANSYS in order to calibrate the§results obtained from the experiments.
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