Determine precamber

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Determine precamber

I am trying to determine the amount of precamber for bulb-tee girders on a sag curve. The Camber and Deflection table reports a higher Excess Camber than the value for D_120. Why is this? Excess camber represents final camber after slab / overlay / traffic barrier loading is applied. The amount of precamber I need should amount to excess camber + sag delta, but the excess camber value seems too high.

Rick Brice
Typically the excess camber

Typically the excess camber is less than D120. However, if you have a case where the bridge does not have a composite deck, the camber growth continues after the superimposed dead loads are placed. The creep related camber could be upwards or downwards depending on the magnitude of the loads and the amount of prestressing.

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