Tacoma Narrows Bridge The Galloping Gertie Why was

Tacoma Narrows Bridge The Galloping Gertie Why was

Tacoma Narrows Bridge The Galloping Gertie Why was it built? Commissioned in 1937 to cross the

Tacoma Straits of Puget Sound Connected Tacoma and Gig Harbor 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 Frederick B. Farquharson Civil Engineering Professor at Univ. of Washington

Commissioned to analyze Moisseiffs Design Dynamic Model of the Tacoma Narrows Bridge Another Suspension Bridge Total Length: 5,000 ft Center Span: 2,800 ft

Tower Height: 420 ft Force Loads Comparisons Width to Span Ratio Bridge Center Span

(ft) Width (ft) Ratio Geo. Washington 3500

106 1:33 Golden Gate 4200

90 1:46 Tacoma Narrows 2800 39

1:72 Girder Depth to Span Ratio The Norm 1:90 Golden Gate

1:168 Tacoma Narrows 1:350 3 Suspension Bridges George

Washington Bridge Golden Gate Bridge Tacoma Narrows Bridge Tourist Attraction

Trussed Girder Cross Section Side View Solid Plate Girder (Tacoma Narrows)

Cross Section Side View Oscillation

Aerodynamic Girder Cross Section Why Did It Fall? Flexibility

Very thin plate girder Width to span Ratio Aerodynamics Plate girder vs wind Perpendicular Wind/Vortices The one that fell and its replacement

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

DISASTER STRIKES

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