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Effect of Shrinkage on Short-Term Deflections of Reinforced Concrete Beams and Slabs. Paper by Peter H. Bischoff and Ryan D. Johnson/AUTHORS' CLOSURE


Due to restraining action of reinforcement, shrinkage-induced tension stresses in concrete may significantly reduce crack resistance and increase deformations of reinforced concrete (RC) members subjected to short-term loading. Gribniak, V.; Kaklauskas, G.\n The first author of the paper has often carried out tests with concrete having a measured rupture modulus closer to 0.62 [the square root of] f'^sub c^ (7.5 [the square root of] f'^sub c^) and, in this instance, the code approach would have underestimated member deflection of beams allowed to shrink before loading because the experimental (restrained) cracking moment would then be less than the ACI computed value.6 Despite the apparently good fit using either the ACI or Eurocode 2 approach for computing the response of the two beams that were allowed to shrink prior to loading Fig. Scanlon, A., "Time-Dependent Deflections of Reinforced Concrete Slabs," PhD thesis, University of Alberta, Edmonton, AB, Canada, 1971.

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									ultimate strength between these two specimens is ascribed to                                  mentioned by the discussers differ only in the order of the
the differences in concrete strengths. The ultimate loads                 
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