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
• Structural Control through Base Isolation
  
• Andrei M Reinhorn
• Professor of Structural Engineering

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Modern Methods in Earthquake and Vibration
Mitigation
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Elastomeric / Natural Rubber Isolators
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Spectral Response
Target Period 2-3sec
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Spectral Response
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Site Effects on Spectral Response
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(No Transcript)
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Steel-Laminated Elastomeric Bearings
Curtesy Scougal Rubber, Seattle, WA
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Deformed Seismic High Damping Rubber Bearing
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Lead Rubber Bearing
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Whitestone Bridge - Rubber Bearings
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Friction Pendulum System
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Friction Pendulum System
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Friction Pendulum System
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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 R6.2m
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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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Ball-in-Cone Isolator - Tekton Dev., Arizona
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Wire Rope Isolators
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Elastomeric Bearing Models
2R
t
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Elastomeric Bearings Properties
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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Lead Rubber Bearings
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Friction Pendulum System
Force Resistance
D
Horizontal Stiffness
Basic Period
Effective Stiffness
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Friction Pendulum System
D
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Design Procedure
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Design Procedure
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Design Procedure
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Design Procedure
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Design Procedure
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Design Procedure
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Design Procedure
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Design Procedure
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Design Procedure
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Design Procedure
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Design Example
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Design Example
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Design Example
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Design Example
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Design Example
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Design Example
DD
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Design Analysis
3D-Basis-Tabs series of computer programs
available Report 95-0011 and Program http//civ
il.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/ (progr
am 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 [phone] Tel [phone] x 2400
• THANKS FOR YOUR
• ATTENTION