| 抄録（英）： |
In seismic strengthening with a reinforced concrete jacket, the application of longitudinal prestress to the jacketing concrete is one means of controlling crack propagation and improving elastic restoration behavior. In this study, the influence of longitudinal prestress, mechanical properties of the tendons, and confinement ratio on crack propagation, failure mode, ductility, and elastic restoration behavior are investigated under load reversal. The results indicate that longitudinal prestress effectively controls crack propagation and im-proves elastic restoration behavior if high strength and high elastic modulus tendons are used. Furthermore, it is demonstrated that elastic restoration behavior is related to the ductility of the strengthened member in the post-peak region.
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