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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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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: Placement Errors for Reinforcing in Concrete Columns
Author(s): Robert G. Drysdale
Publication: Journal Proceedings
Appears on pages(s): 9-15
Keywords: columns (supports);computation;models;reinforced concrete;reinforcing stells;safety;stastistical analysis;strength;tests;tolerances (mechanics).
Abstract:This paper providesd information on the distribution of bar placement errors and illustrates the influence of these errors in column strength. Studies of bar locations in 232 columns from 12 exsisting buildings have shown that the placement errors often exceed specified tolerances. In no cases were bars found to be missing but placement errors greater than 5 in. (12.5 cm) were encountered. Strength calculations based on actual locations of reinforcement showed individual reductions of strength greater than 15 percent and for all columns a mean reduction of nearly 5 percent for all effective eccentricites. Proabablity models to describe the distribution of reinforcing placement errors were derived to facilltiate reliablity analysis.
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