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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: Partial Prestressing in Concrete Corbels and Deep Beams
Author(s): K. H. Tan and M. A. Mansur
Publication: Structural Journal
Appears on pages(s): 251-262
Keywords: corbels; compressive strength;
tressed concrete; shear strength; trusses.
deep beams; flexural strength; pres-
Abstract:Reports on investigation of the effects of partial prestressing on the behavior and strength of concrete corbels and deep beams. Twenty specimens, with the degree of prestress and the shear span-to-effective depth ratio a/d as the main variables, were tested to failure. According to the test evidence, cracks initiated in these specimens at or near the section of maximum moment and the moment at cracking as well as the ultimate shear strength increased with increasing degrees of prestress. The specimens failed in either shear-compression or flexure, with the mode of failure changing from the former to the latter as the degree of prestress increased. The shear-friction theory and the ACI equations for corbels and deep beams were found to underestimate grossly the ultimate strength of the specimens. The truss (strut-and-tie) analogy, on the other hand, gives reasonable predictions of the ultimate strength within the scope of the present test program.
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