Abstract
In the seismic strengthening technique that uses reinforced concrete jacketing, application of longitudinal prestress for jacketing concrete is effective for the control of crack propagation and improvement of elastic restoration behavior. In this study, the influences of longitudinal prestress, mechanical properties of tendons and confinement ratio on crack propagation, failure mode, ductility and elastic restoration behavior were investigated under load reversal. The results indicate that longitudinal prestress is capable of the crack propagation control and elastic restoration behavior is improved by the use of high strength and elastic modulus tendons. Furthermore, the results revealed elastic restoration behavior to be related with ductility of strengthened member in the post peak region.
