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The behavior of concrete and reinforced concrete structures is significantly affected by their sizes. The size effect on flexure and shear strengths of concrete beams has been already confirmed experimentally. This paper presents some results of the size effect on flexure and shear failures for different concrete and reinforced concrete beam sizes subjected to concentrated and uniformly distributed loads. The analysis was carried out by a computer simulation using the program ANACS (Advanced Nonlinear Analysis of Concrete Structures). Using the arc-length method the post peak behavior can be predicted well even for snap back instability.

SIZE EFFECT ANALYSIS FOR FLEXURE AND SHEAR STRENGTH OF CONCRETE BEAMS UNDER VARIOUS LOADING CONDITIONS BY FICTITIOUS CRACK MODEL