Effect of MTMD on Seismic Demand of Base-Isolated Buildings

The effectiveness of multiple tuned mass dampers (MTMD) for vibration control of structure over a single tuned mass damper (STMD) is investigated in the paper. A base isolated structure supported with MTMD is considered and the governing differential equations of motion are derived. The response of the structure under four selected earthquake ground motions is obtained by solving the equations of motion numerically using the state space method. A parametric study is also conducted to investigate the effects of important parameters such as number of dampers in MTMD, damper frequency spacing, mass ratio, tuning ratio. It is found that for a given structural system and level of excitation an optimum value of the parameters (i.e. frequency spacing, tuning ratio) exists at which the peak displacement of structure attains its minimum value. The response time history of the structure with STMD and MTMD with respect to their optimum parameters is compared. It is found that the MTMD is more effective in controlling the response of the structure in comparison with the STMD having the same mass. Citation: Billimoria K.P, SVIT, Vasad; Dr. Soni D.P ,SVIT, Vasad. "Effect of MTMD on Seismic Demand of Base-Isolated Buildings." Global Research and Development Journal For Engineering : 315 - 319.