Outrigger tuned viscous mass damping system for high-rise buildings subject to earthquake loadings

The number of high-rise buildings in urban areas around the world has been increased rapidly. To protect such high-rise buildings from external disturbances, tuned mass dampers (TMDs) have been proposed as an energy dissipation system. The effectiveness of this strategy to wind loadings has been shown, while it is limited against earthquakes due to the limitation of the supplemental mass. Tuned viscous mass dampers (TVMDs) have been developed as an alternative method where an amplified apparent mass is realized by an inertial mass through a ball screw mechanism. However, since they are installed inter-story, they become less effective in high-rise buildings due to insufficient inter-story drifts. To increase the effectiveness of the TVMDs in high-rise buildings, this paper proposes outrigger tuned viscous mass damping systems, in which the TVMDs are installed vertically between the outrigger and perimeter columns of high-rise buildings to achieve large energy dissipation. And the design method for the TVMDs to be tuned to the bending of the building is introduced. Then the validity of the proposed damping system subject to earthquake records are verified through numerical simulation.