212 Ketter Hall, North Campus, Buffalo, NY 14260

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• 212 Ketter Hall, North Campus, Buffalo, NY 14260
  
• www.civil.buffalo.edu
• Fax [phone] Tel [phone] x 2400
• Control of Structural Vibrations
• Lecture 5
• Devices and Models (2)
• Instructor
• Andrei M. Reinhorn P.Eng. D.Sc.
• Professor of Structural Engineering

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Friction (Hysteretic) Dampers

• Models and Implemented Devices

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Friction Devices - Pall System
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Pall Friction Damper
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Pall Friction Damper
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Friction Properties
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Friction System Constantinou and Reinhorn,1991
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Friction System Constantinou and Reinhorn, 1991
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Friction Device - Popov
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Friction Displacement Curves
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Sumitomo Friction Damper
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Sumitomo Friction Damper
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Tekton Friction Damper
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Tekton Friction Device
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(No Transcript)
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Friction Models
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Friction Models
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(No Transcript)
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Sivaselvan-Reinhorn ModelMCEER Report
MCEER-99-0018
Friction Model K0 Very large, or a
0, ?1 ?2 0.5
Model used in IDARC2DVer.5.0
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Friction Connection Brace
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Frame with Friction Bolted Connections
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Additional Friction Dampers
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Additional Friction Dampers
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Re-Centering Dampers and Energy Dissipation
Devices

• Models and Implemented Devices

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Other Energy Dissipation Devices
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K1 K (1 )
K1 K (1 )
K2 K (1 - )
PP0 sgn x K x 1 ? tan a0 sgn (dx/dt) ..
P0 Preload
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Floor Daniel Energy Disipation Restrain (EDR)
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Re-Centering Devices
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Behavior of Recentering Device
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Restoring Force in Fluid Dampers
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Model of Recentering Device
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Re-Centering Devices
Jarret Elastomeric Spring Damper (Mander et al.,
1997)
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Re-Centering Devices
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Shape Memory Alloy

• Materials which experience re-centering
  hysteresis
• Nickel - Titanium Alloy, etc.

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SMA - Stress Strain Response
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Shape memory alloys
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SMA
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Other Dampers and Energy Dissipation Devices

• Special Implementations

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Toggle Braces - Consatntinou et al 1998
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Toggle Braces - Consatntinou et al 1998
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Toggle Braces - Consatntinou et al 1998
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Toggle Braces - Consatntinou et al 1998
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Alternative Assemblies of Dampers
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Comparison of Toggle Dampers
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Tuned Mass Dampers

• Models and Implemented Devices