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Structural Engineering and Mechanics
  Volume 64, Number 6, December25 2017 , pages 731-736

Cyclic behavior of DCFP isolators with elliptical surfaces and different frictions
Gholamreza Abdollahzadeh and Reza Darvishi

    Friction Pendulum isolators are tools developed in the past few decades. The simplest form of these isolators, are FPS whose main disadvantages are having a constant frequency independent of the frequency of the structure. For this reason, researchers have invented VFPI isolator whose frequency is variable and depends on displacement. Another friction pendulum isolator is DCFP isolator which is a combination of two FPS isolators. In this article, first by changing the geometry of DCFP isolator plates from spherical to elliptical, the motion and frequency equations of DVFPI isolators are defined, and then the seismic behavior of DVFPI isolators are analyzed in various geometric and plate friction settings using motion equations, and confirmed using ABAQUS software. The most important results of this study are that the hysteresis behavior of DVFPI isolators are severely nonlinear, its curve follows two distinct curvatures, and that the restoring force is faced with softening mechanism that limits the seismic force transmitted to the structure, whereas the restoring force in DCFP isolators increases linearly with increasing displacement.
Key Words
    earthquake engineering; passive control; base isolation; DCFP; cyclic behaviour; VFPI
Gholamreza Abdollahzadeh : Faculty of Civil Engineering, Babol Noshirvani University of Technology, Iran

Reza Darvishi : Faculty of Civil Engineering, Babol Noshirvani University of Technology, Iran

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