This paper presents numerical analysis on size effect in shear strength of RC beams, and its mechanism accompanying diagonal shear cracks is discussed.It is shown that the tensile stress transfer through bond mechanism and the strain-softening in both tension and shear associated with fracture energy are the main points which cause the size effect.A spatially averaged continuum constitutive model which covers the reinforcement-confined concrete and plain one is proposed for simulating unstable propagation of diagonal shear cracking.The model was verified by using the FEM program applied to RC beams in flexure and shear, and size effect experiments including RC of huge dimension were simulated.
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An et al. (1997) studied this question.
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