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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: Some Factors Which Influence the Strength of Bolt Anchors in Concrete
Author(s): Robert F. Adams
Publication: Journal Proceedings
Appears on pages(s): 131-138
Keywords: no keywords
Abstract:Many types of anchoring devices are used to anchor conduit, machinery, fixtures, etc., to concrete. This paper describes pull-out tests made with the type known as multiple expansion unit bolt anchors. Best results are attained when the bolt anchors are set in a well-cleaned hole of the proper size and depth. The hole should be drilled with a drill which leaves a rough surface. The depth of the holes should be at least four times their diameter, and they could be placed at least two or three times their depth away from an edge or corner of the concrete if possible. Two anchor units are sufficient for bolt anchors using bolts less than 3/4 in. in size, and three units should bc used for those 3/4 in. or larger. If the anchorage is to take shearing loads, the annular space around the bolt above the anchor units should be filled with a rigid material to support the bolt when a shearing load is applied.
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