Court of Appeals San Francisco CA Building Retrofitted with 256 Isolators of type Friction Pendulum...
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Transcript of Court of Appeals San Francisco CA Building Retrofitted with 256 Isolators of type Friction Pendulum...
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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
Construction of Side Beams
Cutting hole for jacks and column removal
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Installation of damperDamper 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
Horizontal Stiffness
Vertical Stiffnesstr = net rubber
thickness
A
t
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 Square Pad
Effective Stiffness for Holed Pad
Effective shear strain
Effective Stiffness for Circular Pad (EI)eff = Ec R4/12
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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
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Lead Rubber Bearings
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Friction Pendulum System
D
W
Force Resistance
Horizontal Stiffness
Effective Stiffness
Basic Period
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Friction Pendulum System
D
W
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Design Procedure
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Design Procedure
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Design Procedure
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Design Procedure