| Title |
Structural Behavior of Cast-in-Place Slabs with Contactless Rebar Coupler for Precast Retaining Walls |
| Authors |
김건수(Kim, Kun-Soo) ; 정규산(Jung, Kyu-San) ; 조한민(Cho, Han-Min) ; 박기태(Park, Ki-Tae) |
| DOI |
https://doi.org/10.12652/Ksce.2024.44.6.0765 |
| Keywords |
프리캐스트 콘크리트; 옹벽 저판부; 철근 겹이음; 비접촉식 철근 커플러; 실물실험 Precast concrete; Retaining wall slab; Lap splice; Contactless rebar coupler; Real scale test |
| Abstract |
Precast retaining walls using cast-in-place foundation slabs mainly use lap splices, hooks or loops to secure the slab reinforcement, and sometimes couplers. When the retaining wall is subjected to soil load and the foundation soil around the retaining wall is lost, the load is concentrated on the foundation slab, which has a negative effect on the structure. In this study, the effect of contactless rebar couplers on the structural behavior of cold joints in precast concrete retaining walls requiring cast-in-place foundation slabs was experimentally analyzed. The connection conditions of the foundation slabs applied in the full-scale test were lap splice and contactless rebar coupler conditions. The ultimate failure mode of both experimental conditions was haunch failure due to bending moment, and the slopes of the initial load-displacement curves were the same. However, the retaining wall using contactless rebar couplers was confirmed to show higher yield strength and stiffness after the yield stage. In addition, the specimens using non-contact couplers showed better results than the specimens using lap splices by attaching strain gauges to the reinforcement and concrete. It was confirmed that this was due to the difference in joint strength depending on the joint conditions of the field-cast rebar. |