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Why "stiffening" girder or truss?

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Dear,
The girder or truss for cable supported bridges are called "stiffening girder or truss".
However, I could not understand why the giders are called "stiffening girder" rather than just girder.
Does anybody know the meaning of "stiffening" ?
Why is it called stiffening girder?
 
Thanx in advance
 
H Gil