Gyung Ju Kang
The Journal of Mechanical Science and Technology, vol. 23, no. 4, pp.1132-1141, 2009

Abstract : This paper presents an analysis of seismically isolated buildings using fiber-reinforced elastomeric structures that are subject to excitations caused by earthquakes. In analyzing the vibrations, the buildings are modeled by lumped mass systems. The fundamental equations of motion are derived for base isolated structures, and the hysteretic and nonlinear- elastic characteristics are included in the numerical calculations. The earthquake waves used as the excitation forces are those that have been recorded during strong earthquake motions in order to examine the dynamic stability of building structures. The seismic (nonlinear) responses of the building are compared for each restoring force type and, as a result, it is shown that the building’s motions are not so large from a seismic design standpoint. Isolating structures are shown to reduce the responses sufficiently allowing the building’s motions to be controlled to within a practical range. By increasing the acceleration of the earthquake, the yielding forces in the concrete and steel frames can be determined, which shows the advantages of performing nonlinear dynamic analysis in such applications.

Keyword : Fiber-reinforced elastomeric isolator (FREI); Steel reinforced elastomeric isolator (SREI); Earthquake; Base isolation;