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212 Ketter Hall, North Campus, Buffalo, NY 14260 civil.buffalo Fax: 716 645 3733 Tel: 716 645 2114 x 2400 PowerPoint Presentation
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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 Reinhorn Professor of Structural Engineering. Modern Methods in Earthquake and Vibration Mitigation.

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Presentation Transcript
slide1
212 Ketter Hall, North Campus, Buffalo, NY 14260

www.civil.buffalo.edu

Fax: 716 645 3733 Tel: 716 645 2114 x 2400

Structural Controlthrough Base Isolation

Andrei M Reinhorn

Professor of Structural Engineering

spectral response
Spectral Response

Target Period 2-3sec

steel laminated elastomeric bearings
Steel-Laminated Elastomeric Bearings

Curtesy Scougal Rubber, Seattle, WA

slide15

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
slide16

Hayward City Hall, CA

53 FPS

15 Taylor Fluid Dampers

Period 3.0 sec

3.5% Friction

+/-28 cm movement

900 tons capacity

slide17

22 FPS

5 sec period

+/- 1.30 m movement

2200 tons capacity

R=6.2m

slide18

San Francisco Airport

International Terminal

267 FPS

3 sec period

+/- 60 cm movement

3000 tons capacity

court of appeals san francisco ca
Court of Appeals San Francisco CA

Building Retrofitted with 256 Isolators of type Friction Pendulum System

installation of fps
Installation of FPS

Cutting hole for jacks and column

removal

Construction of Side Beams

installation of damper
Installation of damper

Damper in place and

grouted to receive load

Cutting the wall along the building

court of appeals retrofit of interior
Court of Appeals- Retrofit of Interior

Walls Protected During

Construction

Interior After Retrofit

elastomeric bearings properties
Elastomeric Bearings Properties

Horizontal Stiffness

A

t

tr = net rubber

thickness

Vertical Stiffness

Circular Bearing

Square Pad

Holed Circular Pad

for strip

for circular

for square

elastomeric bearings properties28
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

modified stiffness
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

friction pendulum system31
Friction Pendulum System

W

Force Resistance

D

Horizontal Stiffness

Basic Period

Effective Stiffness

design analysis
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

slide50
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