Abstract
A method of estimating the reliability of double reinforced concrete members under an axial load at a given eccentricity was proposed by using the probabilistic method, considering the variations in strength of both reinforcing bars and concrete and improving the method which was proposed previously to obtain the reduction factor of the balanced steel ratio, the minimum steel ratio, and the ultimate design strength of the single reinforced flexural member with a specified reliability. The validity of the method was examined by comparing the results with the values provided in the ACI-Code which were decided in the safety side, based on a large number of the test data.