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Vertical curve offsets for camber diagram for curved girder bridge

Vertical curve offsets for camber diagram for curved girder bridge

Vertical curve offsets for camber diagram for curved girder bridge

(OP)
I have a bridge on a horizontal curve.  The bridge is contained within this curve and has 5 spans with the abutments and piers radially placed such that the bearings for all six girders (equally spaced) are referenced to the same roadway station at each substructure unit.  The superelevation is constant throughout the entire length of bridge except the last 12 feet which begins a superelevation transition that continues off the bridge.

My question is regarding the calculation for the vertical curve offset when calculating the camber & deflection tables.  Would the vertical curve offset for each girder at the same point (say 1/4 pt. of a span) be the same for each girder or would the offset be different?  If it is different, how is that difference calculated?  

I would think that since the arc lengths of each girder is different, that the vertical offset would be different.  However; the difference in roadway elevation for each girder at the same reference point is only different by the amount of superelevation from the profile grade line to the centerline of the girder.

RE: Vertical curve offsets for camber diagram for curved girder bridge

The vertical curve offset would be the same if the supports are radial and thus the same bearing points share the same stationing.  Simiarly with any other point so long as we're comparing apples to apples and all points have the same stationing.  The only difference should be the superelevation.

Regards,
Qshake

Eng-Tips Forums:Real Solutions for Real Problems Really Quick.

RE: Vertical curve offsets for camber diagram for curved girder bridge

Agree with Qshake, the key word is radial and the stationing at both abutments for all girders are the same, so for the same points (0, 1/4, 1/2 ...) all girders share a same stationing, which is of cause along the baseline.

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