Optimal parameter design of multiple tuned mass damper for tall buildings using multi-objective particle swarm optimization algorithm considering soil-structure interaction effects

This study focuses on controlling structural vibrations during earthquakes by utilizing tuned mass dampers (TMD) to minimize structural responses. The optimization of damper parameters is crucial for achieving this goal. The research explores the use of multiple tuned mass dampers (MTMD) in place of a single TMD in the roof story. The impact of soil-structure interaction (SSI) on seismic responses is considered, necessitating an investigation into optimizing damper characteristics across different floors. Equations of motion for structures with multiple dampers and SSI were developed, and the state-space method was employed for solving these equations. Generalized mass and stiffness matrices for structures with MTMD and SSI were presented. The study utilized the multiple objective particle swarm optimization (MOPSO) algorithm to determine optimal damper parameters. The parameters of these dampers should be determined in such a way that they lead to minimum seismic responses of the structure. By analyzing 40-story benchmark and 20-story structures, the research highlights the significant influence of SSI on the distribution and stiffness of dampers within the structures, emphasizing the importance of considering interaction effects in damper optimization.