The interest for the stability of the structures against earthquake, which is increasing recently, is rapidly increasing. But, currently, school buildings among the reinforced concrete(RC) structures in Korea are not designed with seismic design or there are many cases of being designed with the old seismic design code, so it is estimated to have not only lives but also a great deal of economic damage are likely to occur when an earthquake occurs. In this study, proposed horizontal friction system(HFS) with rotary friction damper installed as a method to reinforce strength and hardness and to increase ductility for the low story structure of 5 stories or lower such as school buildings. For the seismic retrofitting design with horizontal friction system in which rotary friction damper is installed, Peak displacement response ratio according to elastic and inelastic behavior and ductility demand is calculated to decide elastic stiffness and strength of the HFS, design model and procedure to decide the capacity of HFS thereof is decided, and the feasibility and performance are reviewed through pushover analysis.

• 우성식(단국대학교 부설 리모델링연구소 박사후연구원, 공학박사) | Woo, Sung Sik Corresponding author
• 이상현(단국대학교 건축대학 건축공학과 부교수, 공학박사) | Lee, Sang Hyun
• 정란(단국대학교 건축대학 건축공학과 교수, 공학박사) | Chung, Lan