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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: Behavior of Reinforced Concrete Frames Under
cyclic Loads Using Small Scale Models
Author(s): Gajanan M. Sabnis and Richard N. White
Publication: Journal Proceedings
Appears on pages(s): 703-715
Keywords: cyclic loads; deflection; frames; lateral pressure; limit design method; load-de-flection curves; loads (forces) ; models;moment-curvature relationship;portal frames;prototypes;reinforced concrete;research.
Abstract:Twenty reinforced concrete portal frames were tested to study their response to high intensity repeated loads. Twelve frames (10 small scale models and 2 prototypes) of identical design were subjected to gravity loading; six were loaded continuously to failure and six were subjected to repeated loading. Maximum severity of loading was 10 cycles at each of 85, 90, and 95 percent of ultimate capacity. Eight additional model frames were tested in a program involving complete reversal of horizontal sidesway loading at intensities ranging from 65 to 80 percent of the single cycle ultimate load capacity. It is concluded that the load carrying capacity of the frame is relatively unaffected by repeated gravity loads at magnitudes of up to 95 percent of the ultimate load but is substantially affected by a complete reversal of lateral load. The critical reversible load beyond which frames could not achieve single cycle ultimate capacity was found to be between 75 to 80 percent of the single cycle load. It is also shown that small scale models can be successfully used for studying the detailed behavior of reinforced concrete frames. Good agreement between model and prototype results was obtained for ultimate loads, deflections, moment- rotation characteristics, and over-all structural behavior.
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