Court of Appeals San Francisco CA
Building Retrofitted with 256 Isolators of type Friction Pendulum System
Historic Monument Suffered Damage
in 1989 Loma Prieta Earthquake
Installation of FPS
Construction of Side Beams
Cutting hole for jacks and column removal
Installation of damperDamper in place and grouted to receive load
Cutting the wall along the building
Court of Appeals- Retrofit of Interior
Walls Protected During Construction
Interior After Retrofit
Ball-in-Cone Isolator - Tekton Dev., Arizona
Wire Rope Isolators
Elastomeric Bearing Models
2R
t
Elastomeric Bearings Properties
Horizontal Stiffness
Vertical Stiffnesstr = net rubber
thickness
A
t
Circular Bearing
Square Pad
Holed Circular Pad
for strip
for circular
for square
Elastomeric Bearings Properties
Moment Capacity of Circular Pad
Effective Stiffness for Square Pad
Effective Stiffness for Holed Pad
Effective shear strain
Effective Stiffness for Circular Pad (EI)eff = Ec R4/12
Modified Stiffness-Modified Stiffness for Large S
Modified Stiffness for Very Large S
For Circular Pad - Small S
For Circular Pad Large S
K - bulk modulus of material
Lead Rubber Bearings
Friction Pendulum System
D
W
Force Resistance
Horizontal Stiffness
Effective Stiffness
Basic Period
Friction Pendulum System
D
W
Design Procedure
Design Procedure
Design Procedure
Design Procedure
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