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Tacoma Narrows Bridge

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”

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Tacoma Narrows Bridge

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  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 Moisseiff’s 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. AerodynamicGirder Cross Section

  15. Why Did It Fall? • Flexibility • Very thin plate girder • Width to span Ratio • Aerodynamics • Plate girder vs wind • Perpendicular Wind/Vortices

  16. The one that fell and its replacement

  17. 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

  18. DISASTER STRIKES

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