Abstract
The present study is an attempt to investigate structures equipped with friction dampers under the influence of near-field earthquakes based on Stribeck friction behavior of velocity function. At present, the cyclic behavior of friction dampers in structural design engineering software is simple and based on the Coulomb friction force that is independent of velocity, which should be estimated and considered in terms of Stribeck velocity-dependent friction. Their sliding and vibration methods, including displacement, velocity, and acceleration, are calculated using numerical analysis and differential equation. For this purpose, the representative of the near-field records affects the structure with Stribeck frictional behavior of velocity function as a pulse of Ricker wavelet stimulation. The response of the structure is evaluated in the transition phase from impending motion with a friction coefficient of μs to kinetic motion with μk and vice versa, which makes the poor results of previous simplifications more accurate. Due to the nonlinear behavior of the damping force, programming has been used to perform nonlinear analytical dynamics. Also, behavioral models in OpenSees software are used to investigate the behavior of Stribeck friction for friction damper and to compare its results with the results obtained from accurate analysis.
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Abbreviations
- a p :
-
Amplitude of the pulse excitation
- c e :
-
Damping coefficient of the support
- k e :
-
Stiffness coefficient of the support
- m :
-
Mass of the sliding block
- m e :
-
Mass of the support
- T :
-
Fundamental period of model or nonrigid sliding block
- T p :
-
Period of pulse
- u :
-
Seismic response of displacement
- u e :
-
Elastic deformation of the support
- u s :
-
Sliding displacement
- ü g :
-
Ground acceleration
- \(\dot{u}_{s}\) :
-
Sliding velocity (relative velocity between from static to kinetic friction)
- β :
-
Parameter controlling the transition sharpness from static to kinetic friction
- γ :
-
Viscous coefficient of the contact
- λ :
-
Mass ratio (me/m)
- μ k :
-
Kinetic friction coefficient
- μ s :
-
Static friction coefficient
- ω :
-
Frequency of vibration
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Davari, V., Mansoori, M.R. & Nekooei, M. Effects of Stick-Slip in Behavior of Structures with Friction Damper under Near-Field Earthquakes. KSCE J Civ Eng 25, 3788–3801 (2021). https://doi.org/10.1007/s12205-021-1324-y
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DOI: https://doi.org/10.1007/s12205-021-1324-y