A PROPOSAL OF SEISMIC DESIGN LOAD AND EQUIVALENT ISOLATION RATIO OF SEISMICALLY ISOLATED BUILDINGS COMBINED WITH VARIOUS DAMPERS

－Vertical distribution of seismic design load for seismically isolated buildings corresponding to diversity of seismic isolation devices Part 2－

Abstract

 As previously reported, we have proposed a vertical distribution of seismic design load for seismically isolated buildings (SIBs) corresponding to diversity of seismic isolation devices such as hysteretic dampers and fluid dampers. This proposed seismic design load is obtained from the relationship between response amplification caused by higher-mode responses and Isolation ratio which represents structural characteristics of SIBs.
 In this paper, we build a concept of Equivalent Isolation ratio I_eq which has applicability to various dampers in order to simplify an evaluation formula of vertical distribution of seismic design load. Moreover, an effect of the combination application of various dampers on vertical distribution of shear force coefficient of SIBs is analyzed on the basis of Equivalent Isolation ratio I_eq.