ABSTRACT
For more than five decades, engineers used the equivalent rectangular stress block, the finite-element methods, and the interaction formula to predict the ultimate strength of reinforced concrete sections subjected to axial and biaxial bending loads. The analytical method using basic mathematics and the known stress-strain properties of concrete and steel materials is illustrated in this chapter and compared to the available literature that employs graphical methods of solution such as the standard interaction formula for biaxial bending.
