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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: Assessing Historical Provisions for Bond of Plain Bars
Author(s): Lisa R. Feldman and John Cairns
Publication: Structural Journal
Appears on pages(s): 463-472
Keywords: bar shape; beam-end specimen; casting position; historical code provisions; lap splice; plain reinforcement; structural evaluation; structural safety
Abstract:ACI 562-13 permits development and lap splice lengths of historical reinforcing bar types to be assessed using code provisions that were in effect at the time of construction. A comparison of lap splice lengths for plain bars as predicted using provisions included in historical ACI code editions was therefore made to test results from 25 lap splice specimens and 220 beam-end specimens reinforced with round or square bars cast in the top or bottom position. A factor of safety of 2 was assumed for provisions based on a working stress design (WSD) approach. Provisions in all code editions reviewed do not appear to provide adequate safety for bars cast in the top position, while most appear reasonable for round bars cast in the bottom position. The analysis is also discussed in the context of possible construction scenarios that may be encountered when evaluating or rehabilitating existing reinforced concrete structures.
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