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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: Laboratory Tests of Spaced and Tied Reinforcing Bars
Author(s): William T. Walker
Publication: Journal Proceedings
Appears on pages(s): 365-372
Keywords: no keywords
Abstract:Tests of beam and pull-out specimens containing speed and tied reinfocing arrangements indicated that little or no advantage would be obtained by spacing deformed reinforcing bars at splices. Pull-out tests showed that for deformed bars, placed vertically, in which interlocking of lugs could take place there was a slight increase in strength due to tying the bars. Beam tests showed no significant difference between spacing and tying. Twelve beams containing three different types of deformed bars either spaced or tied and extending the entire lengthof the specimens were tested. The sixty vertical pull-outs tested also contained three different types of deformed bars. Half of these were made with the bars spaced and half with the bars tied together. The reinforcing arrangement brought only one bar out of the specimens for pulling; the other was allowed to bear on the base plate. Spacing of the bars in both beams and pull-outs conformed to the Joint Code minimum spacing requirement of 2 1/2 diameters center to center with a minimum clear distance of 1 1/2 times the maximum size of coarse aggregate.
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