Seismic Performance of Corroded RC Circular Columns Strengthened with Hybrid Fiber Reinforced Polymers

摘要

In order to research the seismic performance of strengthening corroded RC circular columns with hybrid Fiber Reinforced Polymer (FRP) sheets, ten RC columns were tested under cyclic load and constant axial. Test phenomena are described, experimental data are analyzed and compared, and the effect of the axial compression ratio and stirrup reinforcement ratio on the seismic behavior is studied. Results show that the corrosion of steel bars may introduce the brittle failure for RC columns in some extent, and the seismic performance can be enhanced effectively for RC columns strengthened with hybrid FRP. Ductility and energy dissipation are improved significantly, but the bearing capacity can be only increased within limits. When the degree of rebar corrosion is 5.1%, the maximum displacement ductility factor and accumulated energy dissipation of the strengthened corroded columns are 123% and 12.5 times larger respectively than that of the un-strengthened corroded columns.