Experimental and Theoretical Study on the Seismic Performance of Corroded Rc Circular Columns Strengthened with Hybrid Fiber Reinforced Polymers

Corroded RC columns do not possess necessary ductility to dissipate seismic energy during a major earthquake, the study investigates the use of hybrid fiber reinforced polymer (HFRP) wrapping as a method of retrofitting non-ductile corroded RC columns, the seismic performance of corroded RC circular columns strengthened with HFRP are tested under cyclic load and constant axial, and a model to determine the envelope response of RC corroded columns strengthened with HFRP are presented based on cross-section analysis for undamaged RC element. Results show that the rebar corrosion may introduce the reduction of seismic performance for RC columns in some extent, and the technique of strengthening corroded RC column with HFRP is quite effective, ductility and energy dissipation are improved significantly, but the bearing capacity can be only increased within limits. The envelope curve estimated using the linear plane assumption with modification by rebar slip model, may still be used as the envelope curve of RC corroded columns strengthened with HFRP, a good agreement between analytical and experimental results is observed.