Abstract
Decrease of initial prestress in prestressed concrete members in caused by the creep and shrinkage of concrete with the lapse of time after initial prestress in transferred. So, the actual plastic deformation in concrete section can be consided as the shrinkage and the creep of concrete under the i initial prestress were derived in smplified form, which can be applied to the any type of prestressed section with many layers of prestressing tension as well as with or without additional reinforcement. Additionally, the prestress loss under the action of both prestressing force and design loads was discussed for applying the general solutions presented here to the estimation of prestress loss in statically indeterminate prestressed members. An example was also worked out to demonstrate that the accurate estimation of prestress loss can be done from the authors' equations.
