Design of Girder on Curved Alignment - Torsional Demands

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Matt V.
Design of Girder on Curved Alignment - Torsional Demands

This is in regards to the design of straight prestressed girders (chorded) on a curved alignment.

For tub girders, it does not appear that PGSuper accounts for the difference in shear between the interior web and the exterior web that would result in a curved alignment. Is that correct?

More generally, does PGSuper account for the torsion caused by the ecentricty between the center of resistance (girders) and the center of load (slab, overlay, etc.)? I see that there is a difference in shear demands between the exterior and interior girders on a curved alignment, but is this based on tributary area of each girder or directly from the torsion that the bridge resists.

I am trying to verify the extent to which I would need to check shear demands by hand, specifically for the tub girders, when I have a curved alignment/slab. If the answer is that PGSuper does not currently account for this, it would be a nice feature to add in the future.

Thanks!

Rick Brice
PGSuper is limited to

PGSuper is limited to analyzing bridges that conform to LRFD 4.6.2 - Approximate Methods of Analysis. Curvature is limited to values such that the bridge can be treated as a straight structure.

Skew correction factors are applied per LRFD 4.6.2.2.

PGSuper does not perform any specific computations for torsional effects.

I agree it would be a nice feature to add in the future. Is anyone willing to sponsor this work?

Rick

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