PREFABRICATED SFRC JACKETS FOR SEISMIC RETROFIT OFNON-DUCTILE REINFORCED CONCRETE COLUMNS

摘要

In this study an experimental work was carried out on the inelastic behavior of non-ductile columnconfining zones and retrofitting of these zones with prefabricated steel fiber reinforced concrete (SFRC)panels. Six specimens were constructed with low strength concrete (f'c=9.22 MPa) and inadequatetransverse reinforcement. Both longitudinal and transverse reinforcement were plain bars. Thesespecimens were tested under the combined effect of constant axial load and reversed cyclic lateral loads.Three of these specimens had continuous longitudinal reinforcement while the other three had inadequatelap splices. Two specimens from each group were retrofitted with prefabricated SFRC panels of alteringthicknesses. It was observed that both reference specimens, which were not retrofitted, presentedpremature loss of performance either due to buckling of longitudinal reinforcement or loss of bond, whileretrofitted ones exhibited a superior performance. The improvement was in terms of ductility, strength,and failure mode.