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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: Effectiveness of Helical Binding in the Compression Zone of Concrete Beams
Author(s): G. D. Base and J. B. Read-
Publication: Journal Proceedings
Appears on pages(s): 763-782
Keywords: beam, frame, helices, moment-rotation curve, plastic hinge, prestressed concrete, reinforced concrete, reinforcement, research, secondary reinforcement, ultimate strength
Abstract:Reinforced and prestressed beams were tested by mid-span loading to investigate the efficiency of helical rein-forcement in the compression zone as a means of improving the moment-rotation characteristics of the plastic hinges that formed. Helices were generally more efficient than stirrups in terms of weight of steel for a specified increase in plastic rotation. Rectangular stirrups tended to deform outwards and permit the compression zone to crush. Balanced section reinforced concrete beams and rectangular prestressed beams were given adequate plasticity by helices alone, but over-reinforced beams generally required additional shear reinforcement in the form of stirrups.
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