General Discussion
ACI 318-19, Section 20.3.2.6.1 states that prestress losses shall be considered in the calculation of the effective tensile stress in the prestressed reinforcement, fse, and shall include (a) through (f):
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Incremental time-step methods are based on the superposition of elastic and creep strains resulting from increments of stress. Each load increment has associated elastic and creep strains. At any point in time, the total strain can be calculated as the summation of the elastic and creep strains for all loads plus shrinkage strains. One such model is defined in PCI Committee on Prestress Losses (1975).
Hand Calculation
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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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