Abstract
Size effects and shape effects on the flexural strength of concrete were examined through experiments and numerical analysis with fracture mechanics concepts. Based on the numerical results, the authors proposed an equation for estimating the flexural strength of concrete beams with square or circular cross sections. The beam depth, tensile strength, and the characteristic length of concrete beams are the parameters in the proposed equation. The estimated values of flexural strength given by the equation are in good agreement with the experimental results, especially for square beams. The equation gives moderate values for the flexural strengths of various kinds of concrete, including normal concrete, high-strength concrete, lightweight concrete, mortar, and polyester resin concrete.
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