Abstract
After Tokachioki Earthquake of 1968, the importance of shear walls has been recognized again. The other hand the revision of Japanese Building Code has made it necessary to establish the serviceable design formulas of shear walls. From the foregoing points, the ultimate shear strength of reinforced concrete unit walls relating to the mechanism of shear resistance and failure were formulated. The effects of the ratio of reinforcing bar in wall, the ratio of shear wall and additional axial loading of surrounding frame to the ultimate shear strength were discussed, comparing the theoritical values with the experimental values of 28 specimens of past experiments. The formulas of ultimate shear strength modified by multiple regression analysis coincide fairly well with the values of experiments, of which the multiple correlation coefficient is 0.93. They were shown to be used as the design formulas of reinforced concrete shear walls in realistic structural design.
