Development of a Semi-Active Friction Damper for Seismic Structures By Using Leverage Mechanism


Abstract eng:
For seismic protection of structural systems, a semi-active friction damper (SAFD) whose slip force is adjustable in real time, usually provides better control performance than that of a passive damper, since its damping force is adaptive to seismic excitation. However, traditional SAFDs are usually force-controlled devices, whose the slip force is varied by controlling the clamping force directly applied on the friction interface of the damper. Consequently, a huge clamping force has to be generated and the precise control of this force in real time may cause difficulty. To overcome this problem, a displacement-controlled SAFD, called a Leverage-type Controllable Friction Damper (LCFD) is proposed and studied experimentally in this study. The LCFD system consists of a traditional passive friction damper and a leverage mechanism with a movable central pivot (fulcrum). By adjusting the position of the pivot in real time, the equivalent friction force of the LCFD system can be controlled accurately without changing the damper clamping force. To verify the feasibility of this novel system, a prototype LCFD was installed in a single DOF seismic structure that was tested dynamically by using a shaking table. Both the experimental and theoretical results in this study have demonstrated that the friction damping force of the seismic structure with a LCFD can be varied in a desired manner through a displacement control method rather than a force control approach. It also demonstrated that, as compared with passive friction dampers, the energy dissipation capacity of the LCFD can be maximized in earthquakes of various intensity levels.

Contributors:
Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
Rights:
Text je chráněný podle autorského zákona č. 121/2000 Sb.



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 Record created 2017-01-18, last modified 2017-01-18


Original version of the author's contribution as presented on USB, paper 256.:
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