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Sugarland State Fair Stage Collapse on Dateline NBC


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In watching the video it looks like a typical setup for most outdoor concerts (that I've attended). It will forever leave an image in my brain of that roof collapsing, very scary. I hope all those injured or lost loved ones were at least compensated for their distress.

 

It looks like the global truss was thrown like a twig in the wind on that left side before it went down.

 

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If you think about it those structures are just big sails. The engineers here may correct me but if I remember correctly you when you double the wind speed you are increasing the load by a factor of 4X! So if you go from a 20 mph wind to 40 mph the load is quite tremendous on a structure. Look back on the clipper ships of old and they were capable of cruising a large ship 280 ft at 17.5 knots! With only wind power.

http://en.wikipedia.org/wiki/Cutty_Sark

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