The Tacoma Narrows Bridge collapse on November 7, 1940, demonstrates how aerodynamic forces can cause catastrophic structural failure. When wind reached 42 mph, the bridge's flat plate girders acted like sails, catching the wind and inducing violent torsional vibrations that warped the 2,800-foot span 45 degrees from horizontal. The steel cables groaned and snapped under the impossible torque, causing the concrete deck to behave like a liquid until the main span shattered at 11:00 a.m., sending thousands of tons of concrete and steel into the waters below.
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THE BRIDGE THAT DANCED TO DEATH (TACOMA NARROWS 1940) #interesting #viral #storyAdded:
November 7th, 1940.
>> [music] >> Puget Sound, Washington.
The third longest suspension bridge in the world, the Tacoma Narrows, >> [music] >> is a slender, elegant ribbon of steel.
But since it's opening, [music] the locals have called it Galloping Gertie.
In even a slight breeze, the road deck undulates and bounces, [music] a phenomenon the engineers dismiss as harmless.
>> [music] >> On this morning, the wind hits 42 mph.
Gertie doesn't just bounce, >> [music] >> she begins to twist. The flat plate girders act like sails, catching the wind and forcing the bridge [music] into a violent torsional vibration.
The 2,800-ft span begins to warp 45° from the horizontal, the steel cables groaning and snapping under the impossible torque.
A single car is abandoned on the center span.
>> [music] >> For hours, the concrete deck behaves like a liquid, twisting and rippling until the steel supports reach their breaking point.
At 11:00 a.m., the main [music] span shatters.
Thousands of tons of concrete and steel plummet [music] into the churning waters of the sound below.
The bridge that danced until it died.
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