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Stability of a Suspension Bridge during high winds

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Stability of a Suspension Bridge during high winds

Old 01-10-2013, 11:42 AM
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Default Stability of a Suspension Bridge during high winds

Interesting read on the stability of the Whitestone Bridge during Sandy. As some of you already know, the bridge is similar in design to the original Tacoma Narrows Bridge.



One very windy day in 1968, the Bronx-Whitestone Bridge began to oscillate crazily, leading drivers to abandon their cars in panic.

But on an even windier night in 2012, as Hurricane Sandy howled across Long Island Sound and buffeted the span, the bridge stood all but unmoving. The difference? Six thousand fewer tons of steel trusses, which were removed in 2004.
The trusses had been installed in 1946 to stiffen the bridge deck and lessen the chances that the 2,300-foot-long span would break apart in the wind, as the Tacoma Narrows Bridge (“Galloping Gertie“) did in 1940.

But it turned out the trusses were doing more harm than good. Their weight was shortening the bridge’s life span by further stressing the structure. From an aesthetic point of view, they spoiled the slender lines of one of the most beautiful bridges in New York. And when those 70-mile-an-hour winds hit the bridge in November 1968, the deck oscillated all the same, as much as 10 inches.


http://cityroom.blogs.nytimes.com/20...rricane-sandy/


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Old 01-10-2013, 11:56 AM
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Interesting, looks like it also had wind splitters added to the exterior girders.




Bronx-Whitestone Bridge Marks 70 Years As Critical NYC Crossing
http://www.mta.info/mta/news/release...&en=090428-BT9

in 2004, the heavy trusses were removed and lightweight V–shaped wind fairings were installed
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Old 01-10-2013, 12:11 PM
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View from Ferry Point, Bronx

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Old 01-10-2013, 12:20 PM
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View from SUNY Maritime, looking west

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Old 01-10-2013, 12:46 PM
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Tacoma Narrows Bridge Video.....


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Old 01-10-2013, 03:10 PM
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The Throgs Neck Bridge (opened January 11, 1961) was built with trusses beneath the deck

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Old 01-10-2013, 06:18 PM
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http://www.stignacenews.com/news/200..._page/001.html

Mackinaw has an open grate decking on the inside two lanes to reduce total weight carried and avoid wind related problems.
Note the highest wind speed recorded on the span at the end of the article. Seems to work pretty good!

Picture is of some of my wimmins while camping up by Mackinaw. Wife, twin daughters, one of the daughters in law and 5 of the grand daughters.
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Old 01-11-2013, 08:41 AM
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Originally Posted by s_ebels View Post
http://www.stignacenews.com/news/200..._page/001.html

Mackinaw has an open grate decking on the inside two lanes to reduce total weight carried and avoid wind related problems.
Note the highest wind speed recorded on the span at the end of the article. Seems to work pretty good!

Picture is of some of my wimmins while camping up by Mackinaw. Wife, twin daughters, one of the daughters in law and 5 of the grand daughters.
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