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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: Long Cantilever Columns Subject to Long Cantilever Columns Subject to Lateral Forces
Author(s): John E. Breen and Phil M. Ferguson
Publication: Journal Proceedings
Appears on pages(s): 884-893
Keywords: bending moments; bridge piers; columns (supports) ; deflections; interaction diagrams: lateraI pressure; long columns; models: moving loads; reinforced concrete; research; slenderness ratio.
Abstract:Ten model cantilever concrete columns approximately 4 x 6 in. in cross section, with strengths varying from 20 to I20 in., were tested to failure under vertical load combined with a horizontal force. Two failed in compression, four in tension, and four from member instability. For h/f ratios of 5 and 10, agreement with the AASHO and ACI column reduction factors was qood. For h/f ratios of 20 and above, the strengths exceeded the Code values considerably. For h/ratios of 25 or more, service load deflections rather than ultimate strengths would control. Instability associated with creep (or microcracking) of concrete in tension just prior to initial cracking was critical for moderate eccentricities (e/f about 0.3) when h/f was 20 or more, but no instability occurred at e/f of 0.6 to 0.9. Computer analyses usually checked these test results within 3 percent and were reasonably agreement with 24 long columns tests by Gehler and Hutter.
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