Wind-induced motion comfort control analysis of tall buildings by VDTMD+VFD systems

Tall buildings are sensitive to wind loads, with significant wind-induced vibrations reducing comfort. Based on the example of the DY03-07 project in Taiziwan, Shenzhen, this study examines the variable damping characteristics of TMD (Tuned Mass Damper) systems. Wind tunnel experiments were conducted to obtain wind loading data under various recurrence intervals, including frequent and rare conditions. The wind-induced comfort in tall structures is then analyzed using a serial multi-degree-of-freedom simplified model. The results demonstrate that the model can effectively simulate the vibration response of tall structures. Under frequent wind loading, the TMD system exhibits an optimal frequency ratio of 0.98 and a damping ratio of 15%. Under rare wind loading, with a VDTMD (Variable Damping Tuned Mass Damper) system having a c2/c1 ratio of 6, the maximum relative displacement between the VDTMD system and the top structure is 990mm, meeting the specified limit requirements. Under frequent wind loading, the addition of VDTMD+VFD (Viscous Fluid Damper) reduces the peak acceleration of the top structure to 0.143 m/s2, meeting the comfort requirements. Simultaneously, under rare loading wind conditions, the maximum story drifts is 1/1195, indicating a significant reduction in vibration effects.