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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: Effect of Shrinkage on Short-Term Deflection of Reinforced Concrete Beams and Slabs
Author(s): P.H. Bischoff and R.D. Johnson
Publication: Special Publication
Appears on pages(s): 167-180
Keywords: deflection; reinforced concrete beam; shrinkage; stiffness; tension stiffening
Abstract:This paper investigates the influence of shrinkage on tension stiffening in flexure and subsequent effect on short-term deflection in beams and slabs. While shrinkage is typically thought of as being a long-term effect, it can also have a significant effect on the initial short-term response (particularly for beams tested in the laboratory that are used to develop and validate theoretical models for predicting deflection). Shrinkage that takes place before the beam is loaded is locked into the member response, having the effect of reducing the cracking moment (caused by tensile stresses that develop in the concrete from restraint to shrinkage by the reinforcement) and causing a shift in the bare bar response of the cracked transformed section. The lower cracking moment and shift in the cracked member response both work together to increase the immediate (short-term) deflection of a member loaded in flexure. Neglecting this influence leads to a perception of reduced levels of tension stiffening and also affects comparison of theoretical deflection models with experimental results.
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