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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: Monte Carlo Study of Short Time
Deflections of Reinforced Concrete
Author(s): Robert J. Ramsay, Sher Ali Mirza,
and James G. MacGregor
Publication: Journal Proceedings
Appears on pages(s): 897-918
Keywords: beams (supports); cracking (fracturing ); deflection;one-way slabs;reinforced concrete;statistical analysis; stiffness; structural analysis; T-beams.
Abstract:The deflection of a reinforced concrete beam is affected by the variations in the strength of concrete and reinforcement, the cross section dimensions and steel placement, and the applied loads. The effects of these variables on the variability of short time midspan deflections of reinforced concrete fixed-ended T-beams and fixed-ended, one-way slabs were studied using the Monte Carlo technique. The results of this study indicate that the major causes of variability in deflections are variations in the beam stiffness due to cracking of the concrete and the concrete tensile strength. It was also observed that "Building Code Requirements for Reinforced Concrete (ACI 318-77)" predicts the theoretical deflections more accurately than does the 1963 ACI Building Code. Even so, in 1 percent of the cases studied, the 1977 ACI Building Code deflections were less than 50 percent of the theoretical deflections for service loads and in another 1 percent of the cases studied they exceeded 250 percent of the theoretical deflections.
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