Effects of Rocking Motion and Vertical Natural Frequency on Responses of a Seismically Isolated Structure Using LRBs

적층고무베어링을 사용한 면진구조물의 라킹거동 및 수직고유진동수 영향

The objective of this paper is to investigate the effects of the rocking motion and the vertical natural frequency of a seismically isolated structure using LRBs. The governing equations of motion of the rigid body structure, which consider a large rocking motion, are derived. For the mathematical model of LRB, the horizontal stiffness equation based on Haringx's theory is used. From this paper, as decreasing the vertical natural frequency, the rocking responses increase and the horizontal isolation frequency and its earthquake responses are severely affected.