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Abstract
ABSTRACT This study discusses a high-pressure water levitation horizontal seismic isolator designed to prevent the shutdown of critical infrastructure, such as gas supplies, during earthquakes. The device employs a novel method wherein high-pressure water is ejected from levitation pads onto sliding surfaces, elevating the superstructure by approximately 50 μm. In experiments involving a 600 kN superstructure subjected to recorded seismic motions, horizontal acceleration was reduced by a factor of approximately 1/100. Analytical results indicate that the acceleration reduction rate shows an improvement of about 30% compared to conventional methods, such as laminated rubber bearings. Furthermore, integrating this device with a vertical isolator, currently in development, shows promising potential for ensuring the continuous operation of infrastructure during seismic events.
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