This day in history - November 7
Posted: Fri Nov 07, 2008 12:49 pm
1940 - The Tacoma Narrows bridge collapsed, three months after it opened.
The suspension bridge in the state of Washington was one of the longest in the world when it was built. It was based on a novel design that used much less material than the designs of earlier bridges like the Golden Gate.
From the time it opened, the bridge exhibited abnormal movement of the roadway. Residents nicknamed it "Galloping Gertie."
The wind set up resonant vibrations in the vertical cables that supported to the roadway, causing the roadway to literally oscillate and flex. Engineers were frantically trying to devise a solution, but eventually the magnitude of the vibration became so great that the bridge collapsed in a matter of seconds and was entirely destroyed.
A video is available here. If you haven't seen it, it's really worth taking a look.
- Jim
The suspension bridge in the state of Washington was one of the longest in the world when it was built. It was based on a novel design that used much less material than the designs of earlier bridges like the Golden Gate.
From the time it opened, the bridge exhibited abnormal movement of the roadway. Residents nicknamed it "Galloping Gertie."
The wind set up resonant vibrations in the vertical cables that supported to the roadway, causing the roadway to literally oscillate and flex. Engineers were frantically trying to devise a solution, but eventually the magnitude of the vibration became so great that the bridge collapsed in a matter of seconds and was entirely destroyed.
A video is available here. If you haven't seen it, it's really worth taking a look.
- Jim