Seismic Response of Multi-Story Structure With Semi-Active Multiple Tuned Mass Friction Dampers

A passive tuned mass friction damper (P-TMFD) has a pre-determined and fixed slip force at which it controls the response of the structure effectively and at any other values it loses its efficiency. To overcome this disadvantage, semi-active multiple tuned mass friction dampers (SAMTMFDs) are proposed. The predictive control law is used for the semi-active system, so that it can produce continuous and smooth slip forces and eliminates the high frequency response of the structure which usually occurs in case of passive multiple tuned mass friction dampers (P-MTMFDs). Also, the effectiveness of SA-MTMFDs over P-MTMFDs is investigated. The governing differential equations of motion are solved numerically using the state-space method. The response of a five story shear type structure is investigated for four considered earthquake ground motions. The number of tuned mass friction damper (TMFD) units of SA-MTMFDs and P-MTMFDs are varied and the responses of the five story structure with SA-MTMFDs are compared with the responses of the same structure with the P-MTMFDs. For a fare comparison the displacement and acceleration response time histories of the structure with SA-MTMFDs and P-MTMFDs are compared with respect to their optimum controlling parameters. The result of numerical studies indicated that the SA-MTMFDs are more effective and has better performance level than the P-MTMFDs for same input seismic excitations.

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