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How to apply a prestressing force to strands in abaqus?

Submitted by Dina Zakaria on

i modeled a reinforced concrete beam with a t cross-section and after loading it till 80% of its failure load, i repaired it by using post-tensioned concrete jacket.

i have two questions:

1-how to apply the prestressing force to the strands ?

2-i made interaction between surfaces of the main beam and the jacket, this interaction is tangantial and normal only, is it right or i must make cohessive also ?