530 Application of Active Base Isolation System Using Absolute Vibration Control Technology

Abstract

An active base isolation system ， which uses absolute vibration control technology ， has been applied to the real fUll scale buil 砒 lg ， Obayashi Corporation Tecbnical Research Institute Main Building ' Techno − Station ' ． This building is the 丘rst active base isolation bu 皿ding an over the world ． The absolute vibration control is an active vibration control method for base isolated structures to stay in血 e absolute space and to have vibration free environment ， by applying control forces through actuators duing earthquakes ． Four l 100kN hydraulic ac 加 ators ， two in each horizontal dire α ion ， are i 皿 staned in the Techno Station to reduce the seismic response to l／100f the conven 丘onal passive base isolation system ． When applying active control to a real 血 n scale building ， it is necessary to install fail safe mechanism in case that actuators are over −10aded by input ground m α ion of more than expected level or unstable control condition ． As fa 皿 safe mechanism for匸 his absolute vibration control ， the trigger systern using friction dampers has been developed and is installed between actuators and reaction foundations ．