Prestress strand - calculating debond length based on slippage

[bcpotter]

Is anyone familiar with a method for calculating the effective debonding of a prestress strand based on its slippage?

The only reference I've found are the strand stress-strain curves, but using these will only let me calculate a prestress loss over the entire length of the member, whereas an effective debond length will only be on the end of the slippage, and give a more accurate result.

Thanks

 

[shin25]

If by debond length you mean transfer length then check out the link below (page 16 of 30)-

http://www.pci.org/view_file.cfm?file=Peterman.pdf

 

[Lion06]

debonding is when you wrap the end of the strand at the ends of the member to relieve some of the tension at the top. I don't think this is what you're looking for.
Check out the transfer length link provided by shin25.