 Opened to traffic July 1 st 1940  Third largest suspension bridge in the world  Bridge nicknamed Galloping Gertie.

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Presentation transcript:

 Opened to traffic July 1 st 1940  Third largest suspension bridge in the world  Bridge nicknamed Galloping Gertie

 3 Span Suspension Bridge  Length 1810m -Mid span 853m  Engineers valued lightness, flexibility and slenderness  I beam used to support deck instead of truss

 I beams caught the wind  Wind Forced above and below  Vortex caused vertical forces on bridge Why did it collapse

 Aerodynamics not fully understood at the time  Led to further research

 Longitudinal resonance

 Torsional Resonance

 Determine and design for possible “freak” conditions  Understanding of aerodynamics  Using wind tunnel analysis  Testing models in “in-situ” conditions