Abstract :
A fuzzy controller is designed in this paper for semi-active tuned mass damper to decrease
seismic vibration of buildings. To reach a more desirable performance, the upper stories of
an 11-story structure are used as mass damper, i.e. in the first stage the top story, and in the
next stage the upper two stories are used as mass damper. The structure analyses are
performed for uncontrolled, passive control and semi-active control cases and in each case,
maximum displacement, RMS displacement of the stories and RMS base shear are
compared. Moreover, applied damping coefficient and damping force are investigated in
each case. The results show that the proposed semi-active tuned mass damper decreases the
structural displacements where more desirable results can be obtained with smaller structural
damping. By adopting top story as mass damper, the reduction of peak displacements is
more than 35% and by designating the two last stories as mass damper, this reduction will
exceed 55%.
