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Dear SKTO team,

I am trying to model a post-tension bar, I used steel01 material and initialstrain material to add PT force, then assigned truss element. When I run the model the error said physical property must be section, I added a section in special purpose, Do you have any ideas to fix the issue?

Thanks,

Da

It's because you are using a corotTrussSection, which expects a section (like a fiber section for composite trusses).
In your case you just need a corotTruss:

Thanks! working now

you're welcome