This paper examines the seismic performance and structural design of the ceiling bracket-type modular connection. The bracket-type system reduces the cross-sectional area loss of members and combines units using fitting steel plate, and it has been developed to be fit for medium-story and higher-story buildings. In particular, this study conducted the cyclic loading test for the performance of the C-type and L-type brackets, and compared the results. The test results were also compared with the commercial FEA program. In addition, the structural design process for the bracket-type modular connection was presented. The two connections, proposed as a result of the test results, were all found to secure the seismic performance level of the special moment steel frame. In the case of initial stiffness, the L-type bracket connection was found to be great, but in the case of the maximum moment or fully plastic moment, it was different depending on the loading direction.

Abstract
1. 서론
2. 브래킷형 접합부의 실험
3. 브래킷 접합부의 성능
    3.1 실험체의 이력 거동과 특성
    3.2 초기 강성 및 최대 모멘트의 비교
    3.3 절점의 내진 성능
4. 유한 요소 해석과 초기 강성
5. 접합부 구조 설계 방법
    5.1 접합부의 공칭 모멘트
    5.2 볼트 및 천장 단부 브래킷
6. 결론
References

• 이승재(한국기술교육대학교 건축공학과) | Lee Seungjae (Dept. of Architectural Eng., Koreatech Univ.)
• 강창훈(현대엔지니어링㈜ 기술연구소) | Kang Changhoon (Hyundai Engineering Co., Ltd.)
• 박재성(㈜동양구조안전기술 연구소) | Park Jaeseong (Dongyang Structural Engineers Group Co., Ltd.)
• 곽의신(㈜효성구조엔지니어링) | Kwak Euishin (Hyosung Structural Engineering Inc.)
• 손수덕(한국기술교육대학교 건축공학과) | Shon Sudeok (Dept. of Architectural Eng., Koreatech Univ.) 교신저자