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
Hi, Luke. PT rebars modeling via adaptive components is a good idea. But for this purpose I usually use PT tendons family based on structural framing template . It not only creates the tendons, but also sends an analytical model with all loads from post tension in RSA for further analysis. You can read more on my blog: Perfect Project