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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

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




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Spectral Response

Target Period 2-3sec




Steel laminated elastomeric bearings l.jpg
Steel-Laminated Elastomeric Bearings

Curtesy Scougal Rubber, Seattle, WA








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  • 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


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Hayward City Hall, CA

53 FPS

15 Taylor Fluid Dampers

Period 3.0 sec

3.5% Friction

+/-28 cm movement

900 tons capacity


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22 FPS

5 sec period

+/- 1.30 m movement

2200 tons capacity

R=6.2m


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San Francisco Airport

International Terminal

267 FPS

3 sec period

+/- 60 cm movement

3000 tons capacity


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Court of Appeals San Francisco CA

Building Retrofitted with 256 Isolators of type Friction Pendulum System


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Historic Monument Suffered Damage in 1989 Loma Prieta Earthquake


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Installation of FPS

Cutting hole for jacks and column

removal

Construction of Side Beams


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Installation of damper

Damper in place and

grouted to receive load

Cutting the wall along the building


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Court of Appeals- Retrofit of Interior

Walls Protected During

Construction

Interior After Retrofit





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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


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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


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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



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Friction Pendulum System

W

Force Resistance

D

Horizontal Stiffness

Basic Period

Effective Stiffness



















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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


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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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