ABSTRACT
In a laterally excited liquid tank with a high depth-to-base ratio, a large fraction of the total liquid mass is the non-sloshing or impulsive mass that cannot be utilized for energy dissipation. Here, a cylindrical pendulum appendage (CPA) is considered submerged in this impulsive liquid zone, and the oscillation period of the appendage is tuned to the dominant period of the building. During vibration, the liquid drag opposes the oscillatory motion of the CPA leading to energy dissipation. Further, a certain fraction of the impulsive liquid creates added mass effect on the CPA. In this chapter, a passive vibration control system in the form of a deep liquid tank with CPA is designed for an example seven-story building. Its performance when the building is subjected to recorded earthquake ground motions is demonstrated through a numerical study.
