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Concrete is good in shear, so it's shear strength is to be considered in the design of the R.C.C. beam. The shear resistance of a reinforced concrete beam depends upon the following:
1. Grade of Concrete: The shear resistance of concrete increases with the increase in the grade
Of concrete. Higher the grade, higher is the shear strength.
2. Percentage of Tensile Reinforcement: The shear strength of a reinforced concrete beam increases with the percentage of tensile reinforcement.
Based upon the grade of concrete and the percentage of tensile reinforcement I.S. code 456: 2000
gives values of permissible shear stress in concrete in beams without shear reinforcements. 
