For a steel column subjected to combined axial load and bending, how does the interaction diagram visually represent the acceptable limits of these combined stresses, and what does a point outside the diagram signify?

For a steel column subjected to combined axial load and bending, an interaction diagram is a graphical representation illustrating the column's ultimate capacity to resist these combined forces. The diagram typically plots the axial load (P), which is a force acting along the column's longitudinal axis and usually compressive, on the vertical axis, and the bending moment (M), which is a force causing the column to bend or flex, on the horizontal axis. The curve drawn on thi....