The geometry of a cross-section symbol consists of one or more closed contours. Each edge of the contour has a name.
Edge names are:
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Standard for each type of symbol.
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Hard-coded values in the software.
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Defined in the symbol to correspond to the hard-coded values.
The following standard edge names are used:
A profile cross-section, with the exception of pipe and round tube, must have at least the following four edge names defined:
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Top
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Bottom
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Web_Left
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Web_Right
Within the standard names, each type of profile cross-section uses a specific subset of edge names.
I-beams
Includes W and S types.
T
Includes W, S, and M types and fabricated T types.
I-to-T
Angle
Includes equal and unequal leg angles.
Fabricated angle
Channel
Includes S and M types.
Channel cut
Flat bar
Bulb
Bulb T
Pipe
Includes pipe, tube, and round bar.
Rectangular tube