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212 Ketter Hall, North Campus, Buffalo, NY 14260 civil.buffalo

212 Ketter Hall, North Campus, Buffalo, NY 14260 www.civil.buffalo.edu Fax: 716 645 3733 Tel: 716 645 2114 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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212 Ketter Hall, North Campus, Buffalo, NY 14260 civil.buffalo

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  1. 212 Ketter Hall, North Campus, Buffalo, NY 14260 www.civil.buffalo.edu Fax: 716 645 3733 Tel: 716 645 2114 x 2400 Control of Structural Vibrations Lecture #5 Devices and Models (2) Instructor: Andrei M. Reinhorn P.Eng. D.Sc. Professor of Structural Engineering

  2. Friction (Hysteretic) Dampers • Models and Implemented Devices

  3. Friction Devices - Pall System

  4. Pall Friction Damper

  5. Pall Friction Damper

  6. Friction Properties

  7. Friction System Constantinou and Reinhorn,1991

  8. Friction System Constantinou and Reinhorn, 1991

  9. Friction Device - Popov

  10. Friction Displacement Curves

  11. Sumitomo Friction Damper

  12. Sumitomo Friction Damper

  13. Tekton Friction Damper

  14. Tekton Friction Device

  15. Friction Models

  16. Friction Models

  17. 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

  18. Friction Connection Brace

  19. Frame with Friction Bolted Connections

  20. Additional Friction Dampers

  21. Additional Friction Dampers

  22. Re-Centering Dampers and Energy Dissipation Devices • Models and Implemented Devices

  23. Other Energy Dissipation Devices

  24. K1= K (1 + …) K1= K (1 + …) K2= K (1 - …) P=P0 sgn x + K x [ 1 +  tan a0 sgn (dx/dt) ] .. P0 = Preload

  25. Floor Daniel Energy Disipation Restrain (EDR)

  26. Re-Centering Devices

  27. Behavior of Recentering Device

  28. Restoring Force in Fluid Dampers

  29. Model of Recentering Device

  30. Re-Centering Devices Jarret Elastomeric Spring Damper (Mander et al., 1997)

  31. Re-Centering Devices

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

  33. SMA - Stress Strain Response

  34. Shape memory alloys

  35. SMA:

  36. Other Dampers and Energy Dissipation Devices • Special Implementations

  37. Toggle Braces - Consatntinou et al 1998

  38. Toggle Braces - Consatntinou et al 1998

  39. Toggle Braces - Consatntinou et al 1998

  40. Toggle Braces - Consatntinou et al 1998

  41. Alternative Assemblies of Dampers

  42. Comparison of Toggle Dampers

  43. Tuned Mass Dampers • Models and Implemented Devices

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