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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Shrinkage Cracking in Fully Restrained Concrete Members
Author(s): R. Ian Gilbert
Publication: Structural Journal
Appears on pages(s): 141-149
Keywords: cracking (fracturing); crack width and spacing; creep; deformation; reinforced concrete; serviceability; shrinkage; slabs; structural members; Structural Research
Abstract:This paper considers the problem of cracking in fully restrained members subjected to direct tension caused by dry shrinkage. The mechanism of direct tension cracking is discussed, and some popular misconceptions concerning the behavior of restrained members are exposed. Paper presents a rational approach for the determination of the number and spacing of cracks and the average crack width in a member, which is fully restrained and subjected only to an axial restraining force caused by shrinkage. The approach is based on the principles of mechanics and is illustrated by worked examples. Predictions agree well with observed cracking in restrained members. The procedure is used to calculate the quantities of steel required for crack control in a number of practical situations. Finally, the results of the investigation are compared with the provisions for shrinkage and temperature reinforcement in the ACI Building Code (ACI 318-89) and AS 3600-1988.
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