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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 Structural Control through Base Isolation Andrei M Reinhorn Professor of Structural Engineering. Modern Methods in Earthquake and Vibration Mitigation.

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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 Structural Controlthrough Base Isolation Andrei M Reinhorn Professor of Structural Engineering

  2. Modern Methods in Earthquake and Vibration Mitigation

  3. Elastomeric / Natural Rubber Isolators

  4. Spectral Response Target Period 2-3sec

  5. Spectral Response

  6. Site Effects on Spectral Response

  7. Steel-Laminated Elastomeric Bearings Curtesy Scougal Rubber, Seattle, WA

  8. Deformed Seismic High Damping Rubber Bearing

  9. Lead Rubber Bearing

  10. Whitestone Bridge - Rubber Bearings

  11. Friction Pendulum System

  12. Friction Pendulum System

  13. Friction Pendulum System

  14. Liquid Natural Gas (LNG)Tanks • Friction Pendulum System • 212 Isolators • -20oC - 30oC • 1000 tons capacity • 5% friction • +/-30 cm lateral movement • period of 2.75 sec

  15. Hayward City Hall, CA 53 FPS 15 Taylor Fluid Dampers Period 3.0 sec 3.5% Friction +/-28 cm movement 900 tons capacity

  16. 22 FPS 5 sec period +/- 1.30 m movement 2200 tons capacity R=6.2m

  17. San Francisco Airport International Terminal 267 FPS 3 sec period +/- 60 cm movement 3000 tons capacity

  18. Court of Appeals San Francisco CA Building Retrofitted with 256 Isolators of type Friction Pendulum System

  19. Historic Monument Suffered Damage in 1989 Loma Prieta Earthquake

  20. Installation of FPS Cutting hole for jacks and column removal Construction of Side Beams

  21. Installation of damper Damper in place and grouted to receive load Cutting the wall along the building

  22. Court of Appeals- Retrofit of Interior Walls Protected During Construction Interior After Retrofit

  23. Ball-in-Cone Isolator - Tekton Dev., Arizona

  24. Wire Rope Isolators

  25. Elastomeric Bearing Models 2R t

  26. Elastomeric Bearings Properties Horizontal Stiffness A t tr = net rubber thickness Vertical Stiffness Circular Bearing Square Pad Holed Circular Pad for strip for circular for square

  27. Elastomeric Bearings Properties Moment Capacity of Circular Pad Effective Stiffness for Circular Pad (EI)eff = Ec R4/12 Effective Stiffness for Square Pad Effective Stiffness for Holed Pad Effective shear strain

  28. Modified Stiffness- Modified Stiffness for Large S K - bulk modulus of material For Circular Pad Large S For Circular Pad - Small S Modified Stiffness for Very Large S

  29. Lead Rubber Bearings

  30. Friction Pendulum System W Force Resistance D Horizontal Stiffness Basic Period Effective Stiffness

  31. Friction Pendulum System W D

  32. Design Procedure

  33. Design Procedure

  34. Design Procedure

  35. Design Procedure

  36. Design Procedure

  37. Design Procedure

  38. Design Procedure

  39. Design Procedure

  40. Design Procedure

  41. Design Procedure

  42. Design Example

  43. Design Example

  44. Design Example

  45. Design Example

  46. Design Example

  47. Design Example DD

  48. Design Analysis 3D-Basis-Tabs series of computer programs available Report 95-0011* and Program http://civil.eng.buffalo.edu/israeli_engineers SAP2000 available from Computers and Structures, Berkeley, CA IDARC-BRIDGE from University at Buffalo /MCEER Report #98-0011* and Program http://civil.eng.buffalo.edu/idarc-bridge/ (program requires SUN / UNIX computer) * Reports can be obtained from MCEER / University at Buffalo Publications department

  49. 212 Ketter Hall, North Campus, Buffalo, NY 14260 www.civil.buffalo.edu Fax: 716 645 3733 Tel: 716 645 2114 x 2400 THANKS FOR YOUR ATTENTION

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