Evaluation of Structural Performance of Reinforced Concrete Beams using Hybrid Retrofitting with Groove and Embedding FRP Rod and CFRP Sheet

Gee-Joo Ha Young-Joo HaAbstractIn this study, experimental research was carried out to evaluate the structural performance of the reinforced concrete beam usinghybrid retrofitting with two materials (groove and embedding FRP rod, CFRP sheet) in existing reinforced concrete buildings. Seven reinforced concrete beams, retrofitted groove and embedding FRP rod (NER series) and groove and embedding FRP rod with CFRP sheet (NERL series), and standard specimen (NBS) were constructed and tested under monotonic loading. Design parameters of test specimens are the amount of groove and embedding FRP rod and lapping CFRP sheet.Test results showed that the maximum load carrying capacity of specimens with groove and embedding FRP rod and groove andembedding FRP rod with CFRP sheet (NERL series) were increased the by 12~46% and 22~77% respectively in comparison with the standard specimen NBS. Test specimens NER series were failed with the adhesion slip and concrete cover separation. And test specimens NERL series were failed with the adhesion slip due to the confining effect of lapping CFRP sheet.Keywords : R/C beam, Groove and embedding FRP rod, CFRP sheet, Structural performance, Hybrid retrofitting