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 ReinhornProfessor of Structural Engineering

Modern Methods in Earthquake and Vibration

Mitigation

Elastomeric / Natural Rubber Isolators

Spectral Response

Target Period 2-3sec

Spectral Response

Site Effects on Spectral Response

Steel-Laminated Elastomeric Bearings

Curtesy Scougal Rubber, Seattle, WA

Deformed Seismic High Damping Rubber

Bearing

Lead Rubber Bearing

Whitestone Bridge - Rubber Bearings

Friction Pendulum System

Friction Pendulum System

Friction Pendulum System

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

Hayward City Hall, CA

53 FPS

15 Taylor Fluid Dampers

Period 3.0 sec

3.5% Friction

+/-28 cm movement

900 tons capacity

22 FPS

5 sec period

+/- 1.30 m movement

2200 tons capacity

R=6.2m

San Francisco Airport

International Terminal

267 FPS

3 sec period

+/- 60 cm movement

3000 tons capacity

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

Design Procedure

Design Procedure

Design Procedure

Design Procedure

Design Procedure

Design Procedure

Design Example

Design Example

Design Example

Design Example

Design Example

Design Example

DD

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

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