Analysis of Rectangular Reinforced Concrete Columns (Developed for Bendix G-15)

摘要

The problem consists of determining the maximum concrete and steel stresses in a square or rectangular reinforced concrete column subjected to an eccentric axial load. The solution is accomplished by a series of trials. Initially the neutral axis is assumed to be coincident with the axis of symmetry of the section. The properties of the transformed section are computed on this basis and the four corner concrete stresses are determined. From these, the position of the neutral axis is computed, properties of the corresponding effective section are found, and new corner concrete stresses are determined. This cycle is repeated as many times (usually three or four) as necessary to obtain a final solution. At the end of each cycle or trial, the new corner stresses are compared with those previously computed and when agreement within acceptable tolerance is obtained, the solution is complete. Done manually, this problem may take as long as one may-day per trial. Using the electronic computer, the entire problem can be solved in about five minutes including the time required for input. (Author)