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    I know that when the natural frequency of the bridge is met something happens?
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    (Original post by yaya1)
    I know that when the natural frequency of the bridge is met something happens?
    Have a look into what happened with the Millenium Bridge in London, the bridge started moving side to side by quite a large amount.
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    Well there are several things that could happens. erosion can cause early breakdown (especially if its in a chloride enviroment). which can break down the steel even before the concrete (assuming you mean concrete) breaks away. (which can effect the Shear force and Bending moment quiet significatly if left)

    Oxidisation although slow will effect it 360 and seep in. chloride ions can litterally seem in and eat the steal causeing it to debond from the concrete. ect.

    look at the Fosroc website, they do alot of work dealing and testing for this stuff.
 
 
 
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