The deflection of bridge deck is caused by loading and prestress.
Loading, including
the self-weight makes the bridge deck sags, while the prestress effect deflects
the deck upward.
Usually, the
bridge profile should be as desired at the end of construction.
However, adjustment
to profile during casting, namely pre-camber may be introduced to produce
desired bridge profile after the deflection has occurred.
Visually, it is
more pleasurable to make the bridge span appear to be hogging than sagging.
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