EFFECTIVENESS OF TUNED MASS DAMPER IN DAMAGE REDUCTION OF BUILDING UNDER FAR-FIELD GROUND MOTIONS

Abstract eng:
Damage reduction of existing tall buildings subjected to earthquake ground motions has been studied in recent decades. Seismic base isolations, strengthening of structural system and installation of damping devices such as viscous dampers, friction damper and buckling restrained brace, have also been introduced to either reduce the seismic demand, improve the strength or dissipation characteristics of the building. However, their applications are very limited since their investment costs seem to be prohibited. A tuned mass damper (TMD) installed at rooftop is proposed as an alternative method to reduce the seismic damage of the existing tall buildings under far-field earthquake excitations. Due to the long duration and narrow band nature of far-field excitation, its application becomes effective. In addition, the cost of the TMD is more attractive comparing to other seismic control systems. However, the performance of TMD might be seriously impaired due to the degradation of structural stiffness caused by severe earthquake. Therefore the real application of the TMD has to be extensively investigated. This paper studies the damage behavior of tall building under various magnitudes of harmonic and recorded ground motions. The dynamic inelastic analysis is employed. The effectiveness of TMD having mass ratio of 5% is evaluated considering the building’s damage and performance. The obtained simulation results reveal the effectiveness of the TMD under various intensities of ground motions.

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