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A design equation for shear strength is proposed upon investigation of published test results on shear strengths of reinforced concrete beams without web reinforcement. The proposed equation is deduced based on experiments of beams failing in a diagonal tension mode and subjected to no axial force, and basically, this is also the range of application of the equation.The equation has enough simplicity expressed by concrete strength, reinforcement ratio and effective depth in a cumulative form. The accuracy of the equation is acceptable since it is better than that of any other equations.
Okamura et al. (Tue,) studied this question.