In this study, the effectiveness of a multi-action hybrid damper (MHD) composed of lead rubber bearing (LRB) and friction pad was verified in terms of seismic performance improvement of a frame structure. The LRB and the friction elements are connected in series, so the LRB governs the intial small deformation and the friction determines large deformation behavior. Cyclic loading tests were conducted by using a half scale steel frame structure with the MHD, and the results indicated that the structure became to have the stable trilinear hysteresis with large initial stiffness and first yielding due to the LRB, and the second yielding due to the friction. The MHD could significantly increase the energy dissipation capacity of the structure and the hysteresis curves obtained by tests were almost identical to the analytically estimated ones.

ABSTRACT
 1. 서 론
 2. MHD의 이력 특성
 3. MHD 설치 철골 구조물 성능실험
  3.1 실험계획
  3.2 정적가력실험
  3.3 반복가력실험
 4. 비선형 정적해석
 5. 결 론
 REFERENCES

• 노지은(단국대학교 리모델링연구소) | Roh Ji Eun (Seismic Retrofit and Remodeling Research Center Dankook University)
• 허석재(단국대학교 리모델링연구소) | Heo Seok Jae (Seismic Retrofit and Remodeling Research Center Dankook University)
• 이상현(단국대학교 건축공학과) | Lee Sang Hyun (Department of Architectural Engineering, Dankook University) Corresponding author