Application of hybrid mass damper with convertible active and passive modes using hydraulic actuator to high-rise building

A hybrid mass damper using a new type of hydraulic actuator and a multistage rubber bearing to support the moving mass, was developed and implemented to a high-rise building with a 130 m height constructed in Tokyo in 1993. This mass damper works mainly as an active one to effectively control relatively small vibrations of the building caused by winds and weak earthquakes. At the same time, it works mainly as a passive one and can maintain its damper function against strong earthquakes. The active-passive mode switching rules and a gain-scheduled control law were adopted to make the mass damper perform more effectively against frequent winds and earthquakes. Excitation tests for a scale-model and simulations for the full-scale system showed good performance of the mass damper throughout a wide range of excitation intensity of disturbances.