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
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