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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: Investigation of Pre- and Postcracking Shear Behavior
of Prestressed Concrete Beams Using Innovative Measuring Techniques
Author(s): Josef Hegger, Alaa Sherif, and Stephan Gortz
Publication: Structural Journal
Appears on pages(s): 183-192
Keywords: crack; friction; prestressed concrete; shear
Abstract:Until now, no unified theory exists that is capable of fully describing the complex behavior of reinforced concrete elements subjected to shear. On the contrary, one may find recent research results contradict each other. Using innovative measuring techniques, the pre- and postcracking shear behavior of concrete beams is studied giving insight to the shear resistance mechanism of reinforced concrete beams. For studying the precracking behavior, the method of laser-interferometry is applied. It is shown that nonlinear stress distributions take place before the formation of visible cracks, thereby influencing the cracking angle. The photogrammetry is applied to study the postcracking behavior. The measured displacement components of the crack edges are used to estimate the shear transferred across the cracks by shear friction. It will be shown that for beams with low or high shear reinforcement ratios, the amount of shear force transferred across cracks by shear friction is negligible.
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