When entering Beam Section Properties, the dialog will automatically calculate the "Section Properties" for Shapes = Pipe or Solid pipe based on "Section Dimensions" entered, but will not do that for any other shape selected. Why?
Pipe is a round geometrical shape that is easy to calculate the area for solid circle or hollow circle shape and thus section properties. However other Beam shapes (i.e. M-shape, Channel, Tube, etc..) are more complex shapes with to many unknowns (i.e inside radius, chamfers, etc..) to easily calculate the area and thus section properties. Therefore, only Solid pipe and Pipe shape have their section properties automatically calculated. All other shapes the user must enter in user defined values.
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