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Dynamic Response of Structure with Semi- Active Tuned Mass Friction Damper

Alka Y. Pisal and R. S. Jangid
Department of Civil Engineering, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India.

Abstract—A passive tuned mass friction damper (P-TMFD) has a pre-determined and fixed slip force at which it can reduces the response of the structure effectively. At any value other than the pre- determined slip force, it losses its effectiveness and simply behaves as a normal bracing system. Also, P-TMFD changes its state between stick and slip mode many times during a seismic or harmonic excitation which results in high frequency response of the system and reduces its efficiency. To overcome the disadvantage of P-TMFD, a semi-active tuned mass friction damper (SA-TMFD) is proposed. The control algorithm proposed by Lu (2004) which is known as Predictive control law, is used. The SA-TMFD produces continuous and smooth slip force and eliminates the high frequency response of the structure which usually occurs in case of P- TMFD. The governing differential equations of motion of the SDOF system with SA-TMFD are solved numerically using state-space method. To investigate the effectiveness of SA-TMFD with predictive control, the responses of the structure with SA-TMFD are compared with the responses of the structures with P-TMFD under harmonic and earthquake excitations. The result of numerical studies indicated that the SA-TMFD is more effective and has better performance level than the P-TMFD for a same input seismic and harmonic excitations.

Index Terms—P-TMFD, SA-TMFD, Predictive control, Numerical analysis, Harmonic response, Seismic control

Cite: Alka Y. Pisal and R. S. Jangid, "Dynamic Response of Structure with Semi- Active Tuned Mass Friction Damper," International Journal of Structural and Civil Engineering Research, Vol. 2, No. 1, pp. 17-31, February 2013.