Biaxial bending and Biaxial Interaction surface for column section

In comparison to bending about one axis of a reinforced concrete column, biaxial bending presents an entirely different and more complex situation. The neutral axis is at an angle with respect to both axes, and lengthy calculations are needed to determine the location of the neutral axis and strains. The biaxial bending strength of an axially loaded column can be represented by a three-dimensional interaction curve. This surface is formed by a series of uniaxial interaction diagrams that are drawn radially from the vertical axis.




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