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Tacoma Narrow bridge (6 million dollar bridge (3rd. largest in the world,…
Tacoma Narrow bridge
6 million dollar bridge
Construction 1939-July 1st 1940
Millitary, touristic and population benefits
3rd. largest in the world
"Galloping Gertie"
1920's USA monetary prosperity
1930's depression
Cheaper,better and simple bridges
Olympic peninsula- Washington Main
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Clark Eldrigde (designer)
Expensive design
Consultant Leon Moisseif
Changed design , cheaper
8 foot deck system
Problem announcements
No attention to warnings
Dr. F.B. Farqhuarson
Scale model
Wind defunction devices & hydraulic shockers
Wind tunnel studies
Future step for bridge design
Today: New hypothesis and technological designs
Thursday Nov 7th 1940
Twisting motion
10:30 1st concrete section collapsed
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10:32 concrete deck felt down
1 more item...
Violent oscilation