TESTS ON SHEAR CAPACITY OF REINFORCED CONCRETE

To enhance knowledge regarding maximum carrying capacity and rational reinforcement schemes for structures--such as deep beams, corbels, and dapped-end beams--researchers performed tests on 28 prismatic beam samples with a higher percentage of steel than is currently permitted in design practice. The test results indicate that the nominal shear capacity may significantly exceed the current limits of both the American and Canadian codes if proper reinforcement is provided. The ratio of nominal shear stress to the compressive strength of concrete can be as much as 0.42 when horizontal reinforcement is employed, and 0.85 when an adequate inclined reinforcement is provided. Strut and tie models were used to analyze the test results. The strut and tie models generated results comparable with those from the laboratory in all cases. The ultimate shear capacity may be governed either by the compression struts (concrete) or the tension ties (steel). Maximum capacity occurs when the amount of reinforcement at least corresponds with the balanced condition, where the capacity of the tension ties is equal to, or greater than, that of the compression struts.

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  • English

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  • Accession Number: 00712789
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Oct 28 1995 12:00AM