Base isolation system is generally used for low-rise buildings. For high-rise buildings subjected to earthquake loads, a mid-story isolation system was proposed and applied to practical engineering. In this study, seismic responses of high-rise buildings considering the installation story of the mid-story isolation system were evaluated. To do this, the 20-story and 30-story building were used as example structures. Historical earthquakes such as Kobe (1995), Northridge (1994) and Loma Prieta (1989) earthquakes were employed applied as earthquake excitations. The installation location of the mid-story isolation system was changed from the bottom of the 1st floor to the bottom of the top floor. The seismic responses of the example building were investigated by changing the location of the isolation layer. Based on the analytical results, when the seismic isolation system is applied, story drift ratio and acceleration response are reduced compared to the case without the isolation system. When the isolation layer is located on the lower part of the building, it is most effective. However, in that case, the possibility that the structure is unstable increases. Therefore, an engineer should consider both structural efficiency and safety when a mid-story isolation system for a high-rise building is designed.

Abstract
 1. 서론
 2. 해석모델
  2.1 해석모델
  2.2 해석모델링 및 분석방법
 3. 해석 결과
  3.1 면진장치의 이력거동
  3.2 최대 층간 변형률
  3.3 최대 절대 가속도
 4. 결론
 감사의 글
 References

• 김가영(영남대학교 일반대학원 건축학과, 석사과정, Dept. of Architecture, Yeungnam University) | Kim, Ka-Yeong
• 이영락(영남대학교 일반대학원 건축학과, 박사과정, Dept. of Architecture, Yeungnam University) | Lee, Young-Rak
• 김현수(선문대학교 건축사회환경학부 부교수, 공학박사, Div. of Architecture, Architectural & Civil Engineering, Sunmoon University) | Kim, Hyun-Su
• 강주원(영남대학교 건축학부 교수, 공학박사, School of Architecture, Yeungnam University) | Kang, Joo-Won 교신저자