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Shrinkage Restraint and Loading History Effects on Deflections of Flexural Members

The effects of shrinkage restraint cracking and loading history on deflection of reinforced concrete flexural members are discussed. It is shown that deflections of lightly reinforced members (less than 0.8% reinforcement) are highly sensitive to both shrinkage restraint cracking and loading history, whereas deflections of more heavily reinforced members are insensitive to these effects at full service load. Results of a deflection example are presented along with recommendations for changes to the ACI 318 Building Code. Proposed changes include a) adoption of a cracking moment equal to two-thirds the value currently specified in the Code to account for shrinkage restraint stresses; and b) ...

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