Tacoma Narrows Bridge

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If that Bridge started doing that while I was in a car the last thing I would do is stop and park the car. I would be off it so damn fast.

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Posted (edited)

If that Bridge started doing that while I was in a car the last thing I would do is stop and park the car. I would be off it so damn fast.

The authorities put the car there, and later a big truck, to try to retune the oscillations. The problem was that the roadbed was too soft in its twisting strength, so it fluttered like a stop sign in the wind. Earlier suspension bridges used strong stiff boxes for the road bed, this one was made lighter and cheaper. See how deep the box that forms the roadbed is on the Brooklyn Bridge, which was built 50 years earlier than the Tacoma Narrows. That deep box prevents the twisting. See the shot of the original bridge, how shallow the roadbed box is, and then see how strong the box is on the repaired bridge, which is the green one closest in the photo (the pylons were not damaged in the roadbed collapse.)

Brooklyn_Bridge_as_seen_from_FDR_Drive_in_Manhattan.JPG

Tacoma_Narrows_Bridge1.gif

 

Tacoma_Narrows_Bridge_2009.jpg

Edited by nlappos
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