PT Straddle Bent

[TampaBridgeDesign]

Anyone have sample post-tensioned straddle bent plans or calcs they'd be willing to share? Also, what programs are you using to perform these designs?

 

[Qshake]

If the arrangement is complex enough we use ADAPT to design. We've designed quite a few of them especially in Texas where braided interchanges seem to be popular. And as a matter of company policy I'm not in a position to share - sorry.

Regards,
Qshake

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[broekie]

We've done one of those designs and we wrote our own spreadsheet to do the design.

 

[TampaBridgeDesign]

Thanks for your responses. I've got sample plans from Ohio, Florida, Texas and Mississippi. It's interesting to see the variation in the anchorage zone reinforcing between the four different plan sets. For the longer spans (80 feet +) some use pot bearings under the columns while others provided a "pinned" connection by extending reinforcing from the column up into the cap and having the cap sitting on a little shear key with expansion joint material surrounding it. It doesn't allow for the translation like the guided pot bearing but it would allow the cap to rotate freely. We were thinking of using spreadsheets for our designs. The only tricky part may be the phased post-tensioning that we'll likely need.

 

[gbus]

For phased post-tensioining, I suppose you could cross-check by using any conventional PT-software such as ADAPT, BDS, CT-Bridge or CONBOX.