Abstract
Experimental studies that investigate the cyclic behavior of interior heat-damaged RC beam-to-column joints are limited in the literature. This research experimentally investigates the cyclic behavior of eight heat-damaged interior RC beam-to-column joints subjected to a temperature of 900 °C for 3 h and then retrofitted using novel CFRP ropes. Two different groups of joint specimens with different reinforcement details were prepared. Various strengthening configurations were used to find a preferable strengthening configuration. The numerical behavior of the joint specimens was predicted using ABAQUS and then compared to the analytical and experimental results. Test results showed that CFRP ropes increased the lateral strength, drift ratio, and the ductility of the heat-damaged joint specimens up to 50%, 98%, and 53%, respectively. Furthermore, they postponed the appearance of the first crack; thus, CFRP ropes are recommended for strengthening and repairing RC joints subjected to cyclic loading. Test results showed that ACI-440 guidelines are applicable for predicting the lateral strength of RC joints strengthened with NSM CFRP ropes accompanied by an empirical modification factor.
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