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How would you find the natural frequency of a bridge, for example?
in Civil Engineering by  

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Find the mass of the structure (m) , find the stiffness (k) of the material, the bridge is made up of and put them in the equation below:

F = (1 / 2π) * √ (k / m)

The stiffness of the material can be found from a stiffness table. The use of units must also be consistent throughout i.e. If you use Kg for mass, use Nm for stiffness.