Size Effect of Shear Failure in Prestressed Concrete Beams
نویسنده
چکیده
It is shown that the size effect predicted by dimensional analysis of fracture mechanics of failures due to progressive distributed microcracking agrees with the test data existing in the literature better than the presently used strength (ultimate load) criterion, which exhibits no size effect, and better than the linear i!lastic fracture mechanics criterion, which exhibits much too strong a size effect. This finding is similar to that made previously for unprestressed longitudinally reinforced beams. Based on the analysis of over 200 test results from the literature, a simple design formula involving the proper size effect is proposed. Comparison with other existing formulas, including the one presently used in the ACI Building Code, reveals an appreciable reduction in the coefficient of variation of the deviations from test data.
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