Near-fault ground motions, which caused much of the damage in recent major earthquakes (Kobe 1995, Chi-Chi 1999), are characterized by a pulse-like motion that exposes the structure to high input energy at the beginning of the record. The first objective of this research is to compare the dynamic response of seismic isolated and non-isolated building structures subjected to near-fault ground motions with large velocity pulse. Two typical building structures with three stories and eight stories designed by Taiwan seismic design specifications of buildings are adopted for this study. Numerical results show that the seismic performance of isolated buildings is not definitely better than the no-isolated one under some near-fault ground motions with large velocity pulse. Secondly, the isolated building structures retrofitted with supplemental elastic device (SED) or supplemental viscous damper device are analyzed. Parametric studies for the dynamic response of seismic isolated buildings with and without supplemental devices are developed. Analyzed results show that the parameters PGV/PGA ratio and spectral velocity may govern the isolated building response characteristic for input near-fault pulse-like ground motions.

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