Application of Friction Pendulum Damper in Braced Frames and Its Effects on Structural Response

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Application of Friction Pendulum Damper in Braced Frames and Its Effects on Structural Response
S. M. Zahrai, M. S. Bozorgvar, and M. H. Bozorgvar

Abstract—In this paper Friction Pendulum Damper (FPD),
as an innovative friction damper, has been studied, evaluated
and compared with Pall friction damper. At first FPD is
introduced and then its modeling and effect on seismic behavior
of braced frame structures are studied. To evaluate the effects
of radius of curvature and slip-load on structural responses,
nonlinear time history analysis of two, three and eight storey
steel braced frames with FPD dampers have been conducted
under two different earthquakes. Finally, the behavior of steel
braced frames equipped with FPD and Pall friction damper are
compared. The results show that while some members are
damaged in frames without dampers, the FPD and Pall friction
damper have dissipated a lot of energy, so that no damage is
observed in structural members. Increasing the radius of
curvature, leads to more maximum roof displacement but
decreases both base shear and roof acceleration. However,
increasing the slip load leads to less displacement while base
shear and roof acceleration increase. Within the optimum slip
load the maximum roof displacement, base shear and
acceleration under two earthquakes are approximately reduced
25%, 60% and 25% respectively. The results show that the FPD
is more effective than Pall friction damper, so that FPD can
reduces the maximum roof displacement 15% more than Pall
friction damper. However, the base shear is increased about
20%.
Index Terms—Braced frame, friction pendulum damper
(FPD), friction pendulum system (FPS), optimum slip load.

 

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