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Title:

Tacoma Narrows Bridge

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Golden Gate. 1:33. 106. 3500. Geo. Washington. Ratio. Width (ft) Center Span (ft) Bridge. Width to Span Ratio. Girder Depth to Span Ratio. 1:350. Tacoma Narrows ... – PowerPoint PPT presentation

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Title: Tacoma Narrows Bridge


1
Tacoma Narrows Bridge
  • The Galloping Gertie

2
Why was it built?
  • Commissioned in 1937 to cross the Tacoma Straits
    of Puget Sound
  • Connected Tacoma and Gig Harbor

3
People
  • Leon Moisseiff ( 1872- 1943)
  • Bridge Designer
  • Worked on Manhattan and Whitestone Bridges
  • Deflection Theory
  • Stated that the following three opposing forces
    act on the deck and suspension cables
  • one downward force caused by the load of the
    roadway
  • one force in one part of the cable, pulling up
    and to the left
  • one force in the other part of the cable, pulling
    up and to the right

4
Frederick B. Farquharson
  • Civil Engineering Professor at Univ. of
    Washington
  • Commissioned to analyze Moisseiffs Design

5
Dynamic Model of the Tacoma Narrows Bridge
6
Another Suspension Bridge
  • Total Length 5,000 ft
  • Center Span 2,800 ft
  • Tower Height 420 ft
  • Force Loads

7
Comparisons
Width to Span Ratio
8
Girder Depth to Span Ratio
9
3 Suspension Bridges
George Washington Bridge
Tacoma Narrows Bridge
Golden Gate Bridge
10
Tourist Attraction
11
Trussed Girder
Cross Section
Side View
12
Solid Plate Girder (Tacoma Narrows)
Cross Section
Side View
13
Oscillation
14
(No Transcript)
15
Aerodynamic Girder
Cross Section
16
Why Did It Fall?
  • Flexibility
  • Very thin plate girder
  • Width to span Ratio
  • Aerodynamics
  • Plate girder vs wind
  • Perpendicular Wind/Vortices

17
The one that fell and its replacement
18
3 S
  • Social
  • New design used less materials - lower cost
  • Connected two sides of Puget sound
  • Scientific
  • Suspension Bridge Force loads
  • Thin Flexible
  • Solid Plate Girder
  • Symbolic
  • It fell down
  • Revolution in bridge engineering
  • Battle between architecture and engineering

19
DISASTER STRIKES
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