The distribution of concrete stress in reinforced and prestressed concrete beams when tested to destruction by a pure bending moment

A method is given for utilizing experimental data derived from bending tests on reinforced and prestressed concrete beams to determine the stress-strain relationship for concrete. No initial assumption is made as to the shape of this curve, and the result obtained is unique for the given test data, so that the factors which govern the validity of the final result are simply the basic assumptions of the method of analysis.