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Max Bending Moment vs Horizontal/Vertical
The Max Bending Moment vs Horizontal/Vertical is used by the FEA engine when assessing if the bending moments in the cross arm have exceeded the prescribed limits.
The maximum bending moment is calculated using the formula (see article on Neutral Axis for explanation of this concept):
For example consider the following cross arm that has a Section Modulus vs Horizontal of 250cm^4 and Section Modulus vs Vertical of 375cm^4. By pressing the button Derive from section moduli and material strength the calculation performed is as follows which can be seen to match the screenshot below:
