抄録
This paper intends to obtain theoretically the ultimate shear strength of reinforced concrete beams and columns. In the first, the authors started to ask the bearing capacity of plain concrete, and this was reported on the previous paper, (part-3). Next, theoretical equation for the ultimate shear strength of reinforced concrete beams and columns are given with this bearing capacity, which is applied to the assumed statical "TRUSS" action in the shear span. After all, it is obtained that the strength in shear is also vector additional strength of concrete and reinforcements, as well as in bending moment and axial force. Thus, it is clear out that to tolerable agreements to the tendency and values of failure are led from our theories, in conparison of the maltiple regression analysis to the past experimental data. In due consideration of the distribution of ratios of exprimental and theoretical values, it is fined that they exist in 0.7〜1.0 and the second is high rather than the first. It will be regard, in calculating values, as the reason why the tensile strength of concrete, here, F_t/F_c=0, 1, may be less than itself. But, they will be able to be revised to more agreeable values.
