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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: Increased Joint Hoop Spacing in Type 2 Seismic Joints Using Fiber Reinforced Concrete
Author(s): Paul R. Gefken and Melvin R. Ramey
Publication: Structural Journal
Appears on pages(s): 168-172
Keywords: beams (supports); columns (supports); concretes; cyclic loads; ductility; earthquake-resistant structures; energy dissipation; spalling; fiber reinforced concretes; hoops; joints (junctions); metal fibers; stiffness; strength; Structural Research
Abstract:Ten beam-column joints were tested to determine whether increases in joint hoop spacing in conventional concrete Type 2 joints (seismic joints) could be achieved using steel fiber concrete in place of conventional concrete in the joint region. Two cyclic loading sequences were applied to each beam-column specimen. The properties of ductility, ultimate strength, energy dissipation capacity, and joint stiffness of conventional concrete specimens were compared with those for steel fiber concrete specimens having differing increases in joint hoop spacing. It was determined that steel fiber concrete specimens with joint hoop spacings of up to 1.7 times the spacing recommended by ACI-ASCE Committee 352 for a conventional concrete Type 2 joint had the same or better ductility, ultimate strength, energy dissipation capacity, and joint stiffness. This preliminary study suggests that Type 1 joints (nonseismic joints) with steel fiber concretes could be considered for use in place of Type 2 joints in seismic zones.
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