Prestress losses
Prestress losses
(OP)
Does anyone know of a good reference that discusses the calculation of axial shortening losses for prestressed beams? I am particularly interested in comparing the calculation of these losses for non-transformed sections to transformed sections.
Thanks
Thanks





RE: Prestress losses
For me the staple of Prestressed Design is by Edward Nawy. You will find a good balance of theory and practicle applications in that text. Including complete treatment of losses.
Regards,

Qshake
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RE: Prestress losses
I also found an article in the November/December 2002 PCI Journal.
Conspan does not calculate elastic shortening losses to prestressed beams when using transformed section properties. Leap bases this on the PCI Journal article. I’m not sure if this correct or not. Any comments?
RE: Prestress losses
It's an interesting subject: why no shortening losses calculated when transformed section properties are used. Not only LEAP but some other software companies are following same trend. I have not read the article, but it sure conflict with the common logic.
RE: Prestress losses
The lack of responses also interests me. Is it because this is well known and obvious to most, or is it because people are just counting on the software to calculate losses?
RE: Prestress losses
Answering your first question. PCI Bridge Design Manual gives simple but precise method to determine elastic shortening losses in pretensioned beams. If you are interested to see let me know and I will scan the relevant pages.
yakov@yakpol.net