확대머리철근이 정착된 강섬유 보강 콘크리트 외부 보-기둥 접합부의 내진성능

초록

This study aims to verify the possibility of replacing the transverse reinforcement in the exterior beam-column joint where the developedheaded bar with volume fraction of steel fibers, and to evaluate its seismic performance via experiment. Three specimens were fabricatedusing joint transverse reinforcements and steel fiber as variables and reversed cyclic loading tests were performed. As a result of thisexperiment, it showed the same failure pattern as the details of the special moment frame specimen when the transverse reinforcements werenot placed at the joint due to the incorporation of steel fibers. According to the volume fraction of steel fibers, the effective stiffness of thespecimen increased by about 20%, and the maximum strength also increased by 3.5% compared to the specimen with transversereinforcement. Upon analyzing the contribution to the anchorage of the headed bar, it was found that the contribution due to bond increasedwhen the steel fiber was mixed. As a result of the seismic performance evaluation according to ACI 374, the seismic performance of thebeam-column joints was satisfied when the development length of the headed bar was reduced and when sufficient transverse reinforcing barswere provided. In addition, the seismic performance was secured when steel fibers were used instead of transverse reinforcement.

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