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T he current design practice when calculating the flexural strength of prestressed concrete members with unbonded tendons is to use an equation for predicting the stress in the prestressing steel f 8 at the flexural strength which takes into account a number of parameters. These are: p, = A,8/bd, the ratio of prestressing reinforcement; f^ = compressive cylinder strength of concrete; and f8e = stress in prestressing steel due to prestress alone after losses. Note that in the formula for p: A„$ = area of prestressing steel b = width of concrete compression face d = depth of centroid of prestressing steel from concrete compression face The equation used in the 1977 ACI Building Code' is:
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Cooke et al. (1981) studied this question.
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