Heaps of presentation and sample file goodness at each link from here, thanks to Håvard Vasshaug:
Workshops | Havard Vasshaug
Tag: Håvard Vasshaug
Cool post by Håvard Vasshaug, where he describes how he modelled and controlled a post tensioned reinforcing bar using a Revit Adaptive Component. Even better, you can download the family.
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Post Tension Structures in Revit | H�vard Vasshaug