effective prestress

effective prestress

The stress remaining in concrete due to prestressing after loss of prestress; includes the effect of the weight of the member, but excludes the effect of any superimposed load.
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According to equations (7), (8) and (9) coefficient a depends on the initial prestress, the effective prestress transferred to the pretensioned member and Poissons effect of the concrete and pretensioned strand, which causes radial tensile stresses.

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