강판 전단자켓을 사용한 신⋅구 슬래브 접합면의 면외 전단 성능평가 = Out-of-Plane Shear Performance Evaluation of New-to-Existing Slab Interface Reinforced with Steel Plate Shear Jackets

국문 초록 (Abstract)

본 연구는 신설 슬래브와 기존 슬래브의 접합부에서 구조적 일체성과 시공성을 확보하기 위해 강판 전단 자켓 시스템을 제안한다. 이 방식은 후설치 철근 수량을 줄이고, 표면 거칠기 작업을 불필요하게 만든다. 총 다섯 개의 실험체를 대상으로 2점 반복 하중 실험을 수행하였으며, 변수로는 후설치 철근의 개수, 자켓 형상, 강판 두께, 제작 방식을 설정하였다. 실험 결과, 전단자켓을 적용한 실험체는 강도와 연성이 향상되었지만 파괴모드에서 휨 거동이 지배적이었기 때문에 전단 성능을 정량적으로 측정하기 위한 추가 연구가 필요하다.

다국어 초록 (Multilingual Abstract)

In Korea, the demand for horizontal extension remodeling of aging apartment buildings is increasing. To ensure structural integrity andimprove constructability at the connection between new and existing slabs, this study proposes a steel plate shear jacket system. This methodreduces reliance on post-installed rebars and eliminates the need for surface roughening. Five specimens were tested under five-point verticalloading, with variables including the number of post-installed rebars, jacket shape (Z- or L-type), plate thickness, and fabrication method(bending or welding). Results showed that shear jacket specimens had higher load capacity (up to 1.14 times) and significantly improvedductility compared to the control. The jackets delayed interface slip and shifted failure modes from brittle shear to ductile flexural behavior.
Thicker plates and orthogonal rebars enhanced performance. Plastic analysis reflecting positive moment resistance showed good agreement withtest results (77–93%), whereas elastic analysis underestimated strength. Although the test setup aimed to induce pure shear, flexural actiondominated. Further research is needed to isolate shear behavior and better quantify the strengthening effect. Overall, the proposed detail iseffective for enhancing structural performance and constructability in slab extension remodeling.