AbstractThe irregular shape of three large balconies in a performing arts center resulted in areas at the balcony tip and edge susceptible to potentially annoying levels of vibration. To mitigate this effect, the building designers added tuned mass dampers to the underside of each of the three balconies. Proper implementation of tuned mass dampers requires reliable information about the dynamic properties of the structural system. Finite-element models of the structure were constructed and experimentally verified. These models were used to determine the size, frequency, and damping ratio of three tuned mass dampers, two of which targeted the first bending mode of the edge and the remaining one targeted the first bending mode of the tip, for each balcony. The suspensions of the tuned mass dampers were made up of two laminar flow viscous damping units along with eight precompressed helical steel springs. The mass of the tuned dampers were selected as a small percentage of the modal mass of the modes targeted for damping. On completion of the tuned mass dampers installation, the effectiveness of the damping solution was evaluated via further testing.