N-M Interaction Diagrams
Three types of interaction diagram are available:
Single load angle, where there is a constant ratio of My/MX and variable reinforcement percentage.
Multiple load angles, with a constant reinforcement percentage and variable load angle.
N-Mx with My contours, where a family of curves shows the N-Mx capacity of the column section with varying values of My moment.
RC.Column uses powerful graphical capabilities to help you visualise the strength characteristics of the column, the loads, and the effects of slenderness. The accompanying image shows a virtual reality view of a section failure surface, with column end loads represented for a single load case as coloured points. The arrows illustrate the moment magnification that occurs in slender columns. Any point outside the interaction surface indicates that the column has failed the code design check. Clicking the Design button automatically increases the bar size until all the points outside the failure surface are inside it.