What is your source? A link please. A link with more information was posted on Eng-Tips. Florida Department of TRANSPORTATION - Denney Pate signed and sealed FIU bridge construction plans - 2016 & 2017 https://cdn2.fdot.gov/fiu/13-Denney-Pate-signed-and-sealed-FIU-bridge-construction-plans.pdf From this new information ... Please Register or Log in to view the hidden image! - which is completely different from the PT bar tensioning requirements suggested in the proposal pdf, but there still doesn't seem to be any obvious method employed in calculating the PT bar tension from the maximum tension force in the truss members that I calculated. Please Register or Log in to view the hidden image! My method was somewhat arbitrary - recommend a PT bar force equivalent to about 130% of the maximum tension force that member experiences. I don't know what the recommended practice for setting PT bar tensions is - or if indeed there is a recommended method - how much in excess of the tension required is the bar tension set to - is but my guess is that neither does W. Denny Pate. Or perhaps he is using a method but he starting from a radically different truss calculation?