Multi-objective optimization and seismic performance verification of multiple tuned impact dampers for nonlinear benchmark building

This paper presents a type of multiple tuned impact damper (MTID), endowed with the wide frequency band of vibration attenuation and effectiveness for multi-mode control, to mitigate the vibrations of the seismically excited high-rise buildings. Focusing on multi-objective optimization, the concept of the multi-objective multi verse optimizer (MOMVO) is utilized for developing the design procedure for MTID towards the best parametric solutions. Moreover, a series of analytical comparisons are conducted between the optimally and conventionally designed MTIDs on a 20-story nonlinear benchmark building to verify the superiority of the proposed multi objective optimization method. The optimal control effects of the MTID system are systematically evaluated from basic response indexes to nonlinear behaviors of the benchmark building. Furthermore, the performance of optimal distributed MTID systems with various placement strategies is also investigated for effective installations of TIDs. Finally, the damping mechanism of various distributed MTIDs is clarified based on the evaluation of energy comprising seismic input energy, structural energy, and the energy of the damping systems. The results show that the optimal MTID systems provide good reduction effects on dynamic responses and nonlinear damage of the primary structure with hyposensitivity to the uncertainty of seismic excitations. The proposed design algorithm for MTID systems can be an attractive alternative to effectively obtain optimal parameters of the controllers. In addition, a reasonable installation strategy allows for an increase in energy transfer speed and energy transfer amplitude, thus improving the damping capacity of the MTID system.