Parameter optimization of MTMD for wind-excited vibration suppression of tall buildings

A study on optimizing the parameters of multiple tuned mass dampers (MTMD) for wind-exited vibration suppression of high-rise buildings is described. Based on the three-dimensional finite element model for design analysis of tall building, a reduced-order lumped mass MDOF model with the same modal properties as the original model is developed for MTMD design. By dividing the building-damper system into two sub-structures, transfer functions of the building with MTMD attached at arbitrary stories are explicitly derived, and random responses of the building-damper system are accurately expressed by adopting appropriate wind force spectrum and accounting for spatial coherence of the excitation. With these analytically derived formulations, the genetic algorithm is then applied to search optimal parameters of the MTMD, which achieve the maximum response suppression for the building. A study of an actual 50-storey tall building in HK using MTMD for the wind-excited response mitigation is given as an example.