Development of Seismic Isolation Techniques for Elevated Platform of Hi-Tech Factory Building 

[[abstract]]The maximum seismic resisting limit for Hi-Tech buildings is about 200 gal. When the building foundation is subject to more than 200 al, the resulting acceleration will cause damages to various facilities. A simple damper may not have sufficient capacities to protect the building and facilities. Using multiple simple dampers to provide sufficient protecting capability is not cost-effective in addition to being difficult for future renovation. In this research, a seismic isolation elevated floor system is proposed and tested by installing Velocity Dependent Hydraulic Damper, VDHD as a shock absorption element in a Hi-Tee factory building. Results of numerical simulation indicate that this seismic preventing system reduces the horizontal movement and enhances the damping ratio of the seismic isolation layer to prevent facilities from being toppled over when excessive displacement of the isolation pad occurs. These analysis results confirm that this proposed system that combines VDHD, elevated-floor, and isolated pad of friction simple pendulum can lower the displacement of seismic isolation layer so that it is not affected the by minor machine vibration.[[note]]SC