In this study, the seismic response is investigated by using a relatively low-rise building under torsion-prone conditions and three seismic loads with change of the location of the seismic isolation system. LRB (Lead Rubber Bearing) was used for the seismic isolator applied to the analytical model. Fixed model without seismic isolation system was set as a basic model and LB models using seismic isolation system were compared. The maximum story drift ratio and the maximum torsional angle were evaluated by using the position of the seismic layer as a variable. It was confirmed that the isolation device is effective for torsional control of planar irregular structures. Also, it was shown that the applicability of the midstory seismic isolation system. Numerical analyses results presented that an isolator installed in the lower layer provided good control performance for the maximum story drift ratio and the maximum torsional angle simultaneously.

Abstract
 1. 서론
 2. 해석 모델
  2.1 해석 모델 개요
  2.2 해석 모델 및 면진 장치
  2.3 해석 모델 및 분석 방법
 3. 해석 결과
  3.1 면진 장치의 최대 변위와 전단력
  3.2 최대 층간 변형률
  3.3 최대 비틀림각
  3.4 면진 장치의 이력 거동
 4. 결론
 References

• 강주원(영남대학교 건축학부) | Kang Joo-Won (School of Architecture, Yeungnam University) 교신저자
• 김현수(선문대학교 건축사회환경학부) | Kim Hyun-Su (Div. of Architecture & Civil Engrg., Sunmoon Univ)
• 박효선(영남대학교 일반대학원 건축학과) | Park Hyo-Sun (Dept. of Architecture, Yeungnam University)