Investigation of the effect of the mass and installation height of TMD system on the wind-induced vibration control of tall buildings

Tuned mass damper(TMD) is an efficient tool to control wind-induced vibrations of tall buildings. Previous studies on the effect of TMD are generally limited to specific conditions. In the present study, the effect of the mass and installation height of TMD on the wind-induced vibration control of tall buildings are investigated. An example of tall building with the height 400 m and square variable cross section is presented. The analytical model of the building is assumed as a multi-degrees-of-freedom vertical cantilever beam with the masses lumped at the nodes. The wind-induced responses of the structure are computed using the frequency domain analysis and the random vibration method for a wide range of studied parameters. The results indicated that the vibrations of the structure and TMD system decreases with increasing the mass of the TMD. For instance, the 100 and 600-ton TMD installed at top-floor reduced the top-floor crosswind acceleration by 31 and 48 percent, respectively. By increasing the installation height, the control effectiveness of the system increases, while the vibration of the TMD does not change considerably. For a 300-ton TMD installed at 320 and 400 m heights, the crosswind acceleration reduced by 33.72 and 41.28 percent and the RMS displacement of the TMD at these heights were 58.68 and 54.92 cm, respectively.