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Shrinkage Restraint and Loading History Effects on Deflections of Flexural Members
- Article from:
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ACI Structural Journal
- Article date:
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July 1, 2008
- Author:
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;
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Copyright informationCopyright American Concrete Institute Jul/Aug 2008. Provided by ProQuest LLC. (Hide copyright information)
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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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