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‘Galloping Gertie’ The Tacoma Narrows Bridge Failure

‘Galloping Gertie’ The Tacoma Narrows Bridge Failure. November 21, 2006 Max Walker Robby Poshusta Jan Kubica Aaron Aslin. History. Started November 23, 1938 Opened to the Public July 1, 1940 Designed by Clark Eldridge Altered by Leon Moisseiff

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‘Galloping Gertie’ The Tacoma Narrows Bridge Failure

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  1. ‘Galloping Gertie’The Tacoma Narrows Bridge Failure November 21, 2006 Max Walker Robby Poshusta Jan Kubica Aaron Aslin

  2. History • Started November 23, 1938 • Opened to the Public July 1, 1940 • Designed by Clark Eldridge • Altered by Leon Moisseiff • Pacific Bridge Company, General Construction Company, Columbia Construction Company

  3. Location

  4. Random Facts • Greatest Span 2,800ft • Total Length 5,979ft • Cost – $8 million • 17.25” Diameter Cables • 6,308 wires spun one at a time to make the large cables. • Third largest suspension span in the world at the time.

  5. Engineering Design Included: • Suspension bridge • Two Towers • Two Main Cables • Two Anchorages • One Lane Highway

  6. Engineering Anchorages

  7. Engineering • False Bottom Caisson • 600 ton blocks of concrete were used to anchor the caisson

  8. Collapse

  9. Collapse • 11am on November 7, 1940 • 42 M.P.H. wind • No one died in the collapse • Several cars were thrown into the water

  10. Collapse Mechanical Resonance • A • B • C • D

  11. Collapse

  12. Outcome • “The consulting designer, Leon Moisseiff felt the fall occurred because engineers did not know enough about aerodynamics, and that lack of funds had forced the building of a bridge unprecedently narrow for its length. (University of Washington- Special Collections)”

  13. Bibliography • University of Washington Special Collections- Tacoma Narrows Bridge. November 16, 2006. <http://www.lib.washington.edu/specialcoll/exhibits/tnb/default.html> • WSDOT- Tacoma Narrows Bridge: Extreme History. November 16, 2006. <http://www.wsdot.wa.gov/TNBhistory/>

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