Base isolation technology may be used for seismic protection of equipment in critical buildings. However, recent studies have revealed that a conventional passive isolation system may induce an excessive base displacement when subjected to a near-fault earthquake with strong long-period components. In order to enhance the efficiency and safety of seismic isolation for equipment in near-fault areas, a semi-active isolation system (SAlS) that consists of a sliding platform and a piezoelectric variable friction damper is proposed in this study. The slip force of the variable friction damper is adjusted by an embedded piezoelectric actuator according to a control law and the system response. The piezoelectric actuator was chosen as the control device, because of its low-energy consumption, short responding time and compact size. The seismic response of the SAIS system subjected to near-fault earthquakes was simulated numerically in this study. In addition, its isolation performance was also evaluated and compared with the performance of a passive and an active isolation system. The results of these comparisons are discussed in this study. The simulation result demonstrates that the SAIS system can prevent the excessive displacement and acceleration response of equipment induced by long-period pulse components of near-fault earthquakes.
|Number of pages
|Journal of the Chinese Institute of Civil and Hydraulic Engineering
|Published - 2010 Mar 1
All Science Journal Classification (ASJC) codes
- Civil and Structural Engineering