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

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Presentation transcript:

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 damper Damper in place and grouted to receive load Cutting the wall along the building

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

Wire Rope Isolators

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Elastomeric Bearings Properties Horizontal Stiffness Vertical Stiffness t r = 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 = E c  R 4 /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W Force Resistance Horizontal Stiffness Effective Stiffness Basic Period

Friction Pendulum System D WW

Design Procedure