| Title |
Seismic Performance of Steel Fiber Reinforced Concrete and Exterior Beam-column Joints With Headed Bars |
| Authors |
손동희(Son, Dong-Hee) ; 정다운(Jeong, Daun) ; 유무영(Yoo, Mooyoung) ; 배백일(Bae, Baek-Il) ; 최창식(Choi, Chang-Sik) |
| DOI |
https://doi.org/10.5659/JAIK.2022.38.11.307 |
| Keywords |
Steel fiber reinforced concrete; exterior beam-column joint; headed bar; seismic performance |
| Abstract |
This study aims to verify the possibility of replacing the transverse reinforcement in the exterior beam-column joint where the developed
headed bar with volume fraction of steel fibers, and to evaluate its seismic performance via experiment. Three specimens were fabricated
using joint transverse reinforcements and steel fiber as variables and reversed cyclic loading tests were performed. As a result of this
experiment, it showed the same failure pattern as the details of the special moment frame specimen when the transverse reinforcements were
not placed at the joint due to the incorporation of steel fibers. According to the volume fraction of steel fibers, the effective stiffness of the
specimen increased by about 20%, and the maximum strength also increased by 3.5% compared to the specimen with transverse
reinforcement. Upon analyzing the contribution to the anchorage of the headed bar, it was found that the contribution due to bond increased
when the steel fiber was mixed. As a result of the seismic performance evaluation according to ACI 374, the seismic performance of the
beam-column joints was satisfied when the development length of the headed bar was reduced and when sufficient transverse reinforcing bars
were provided. In addition, the seismic performance was secured when steel fibers were used instead of transverse reinforcement. |