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Two common methods are published in the PCI Handbook method (Zia et al. 1979), and the AASHTO LRFD specification. The AASHTO LRFD simplified method is an estimate of time-dependent losses, using approximations and assumptions to simplify the detailed AASHTO LRFD method (Tadros et al. 2003).
Long Term Losses - Detailed
Long term detailed loss calculations can be further subdivided into two categories: age-adjusted effective modulus methods and incremental time-step methods.
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References
ACI Committee 423. Guide to Estimating Prestress Losses. ACI 423.10R-16. Farmington Hills, MI: ACI.
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