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- W2281495340 abstract "Theoretical time-dependent deformations and prestress losses in pretensioned, prestressed simply supported concrete girders, based on the revised rate of creep method, are presented. The effects of age of precast girders at the time of casting of the deck concrete, time of transfer of prestress, deck dead load, type of prestressing strands (stress-relieved or low-relaxation strands), initial level of stress in the concrete, and the effects of varying environmental conditions on the behavior of concrete structures are studied. Predicted unit creep and shrinkage strains versus time relationships are based on the 1970 C.E.B. recommendations and relaxation losses for stress relieved strands are estimated using the expressions developed by Magura, Sozen, and Siess. A similar expression is used for the case of low-relaxation strands. Predicted deformations are compared with long-term measurements made on full-sized bridge structures located in Illinois. Annual cyclic variations of the total strains and total prestress forces occur in all structures located outdoors. Two recommended sets of factors for the estimation of prestress losses are given, one for the case of stress-relieved strands and the other for the case of low-relaxation strands. /FHWA/" @default.
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- W2281495340 date "1975-05-01" @default.
- W2281495340 modified "2023-09-26" @default.
- W2281495340 title "TIME-DEPENDENT PRESTRESS LOSSES IN PRETENSIONED CONCRETE CONSTRUCTION" @default.
- W2281495340 hasPublicationYear "1975" @default.
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