Effectiveness of Tuned Mass Dampers in Mitigating Seismic Vibration of Multi-Story Building

The concept of structural control is now widely accepted and has frequently been applied to civil structures. Among the numerous control methods available, the tuned mass damper (TMD) composed of a mass, a spring and a damper is more often used as a passive control device in practical application. Effectiveness of tuned mass dampers in mitigating seismic vibration of Multi-Story building is investigated in this paper. To achieve this purpose, in this paper, 5,8,10 and 15 story flexible building stylizing a structural system with special moment-resisting frames in both directions are considered. Assuming its frequency to be near the 1 st natural frequency of building, it is designed to control the mode that makes contribution to the largest response of the building and in order to design TMD parameters. Time-history analysis is preformed on the structures considered under the Tabs and El Centro earthquakes. In this works, TMD in installed on top of the structure to reduce the displacement and the damage induced by ground excitations. It is observed that TMD is effective in reducing maximum displacement in Multi-Story buildings by as much as 32% under the Tabs earthquake and 45% under the El Centro earthquake, Also the results show much improvement in reducing structural displacement, except for the RMS in 15 story structure.

Keywords:

Tuned mass damper , Multi-story building , Seismic response , Passive control and Time history analysis