Self-compacting concrete was first developed in 1988 to achieve durable concrete structures. Since then, various investigations have been carried out and this type of concrete has been used in practical structures in Japan, mainly by large construction companies. Investigations for establishing a rational mix-design method and self-compactability testing methods have been carried out from the viewpoint of making selfcompacting concrete a standard concrete.

Self-compacting concrete was first developed in 1988 to achieve durable concrete structures. Since then, various investigations have been carried out and this type of concrete has been used in practical structures in Japan, mainly by large construction companies. Investigations for establishing a rational mix-design method and self-compactability testing methods have been carried out from the viewpoint of making selfcompacting concrete a standard concrete.

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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.