Seismic isolation offers an attractive approach for reducing seismic loads in the building and in its components. This paper deals with the seismic isolation effects due to variation in period ratio between superstructure and isolation layer of the building. Seismic isolation effects of the moment-resisting frames with the various period ratio were studied by nonlinear time history analysis. It is recommended that the isolation period should be greater than 2.0 times of that of the superstructure for the effective seismic isolation.

• 천영수(한국토지주택공사 토지주택연구원 수석연구원) | Chun, Young-Soo
• 허무원(삼영엠텍(주) 내면진기술연구소 선임연구원) | Hur, Moo-Won
• 이상현(단국대학교 건축공학과 부교수) | Lee, Sang Hyun