Application of Active Base Isolation System Using Absolute Vibration Control Technology


Abstract eng:
Active base isolation system using absolute vibration control technology has been applied to a real full scale building. The building is Techno Station of Obayashi Corporation Technical Research Institute, the New Main Building of this facility. This has become the first active base isolation building all over the world. The applied active base isolation system utilizes absolute vibration control theory. The absolute vibration control is active vibration control method for base isolated structures to stay in the absolute space and to have vibration free environment, by applying control forces through actuators during earthquakes. This control includes feedforward control, which applies counter force of the input ground motion, and feedback control, which adds absolute damping to the structural system. To confirm the performance of this absolute vibration control, shaking table tests were conducted for a 3 story small scaled building frame model. It was shown that by applying absolute vibration control, the acceleration of top of the model was reduced to about 1/10 of conventional passive base isolation buildings. When applying absolute vibration control to a real full scale building, it is necessary to install fail safe mechanism in case that actuators are over loaded by input ground motion of more than expected level or unstable control condition. As fail safe mechanism for this absolute vibration control, the trigger system using friction dampers is installed between actuators and reaction foundation. Owing to this trigger system, active control force from hydraulic actuators is limited to the allowable design force. The seismic performances of the active base isolation building are discussed through numerical simulation results. After completion of this building, observation data for several earthquakes are obtained by the monitoring system. These results are also introduced. This active base isolation system can be applied not only to whole buildings, but also to some limited areas inside buildings. The prototype of the active base isolation floor has been developed and installed in the new multi-purpose open laboratory (OL2) of Obayashi Corporation Technical Research Institute. This active base isolation floor is expected to be applied to some very important rooms, which require high seismic performance, such as operation rooms in hospitals, server rooms in data centers, exhibition rooms in museums, and so on.

Contributors:
Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
Rights:
Text je chráněný podle autorského zákona č. 121/2000 Sb.



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 Record created 2017-01-18, last modified 2017-01-18


Original version of the author's contribution as presented on USB, paper 3945.:
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