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The polygonal section editor allows the user to ‘fine tune’ a typical section to meet the requirements of a specific precaster. Start with a typical section (such as a T-Beam), and then select ‘Polygonal’. The typical section will then be automatically converted to a polygonal section. Pressing the ‘Edit Verticies’ button will display a dialog box that allows you to do just that, edit the individual verticies of the section.See more about polygonal sections in the Polygonal Section Editor section
Polygonal Section Editor
The section editor contains 1-3 tabs. The ‘Flexure Section’ defines the section used to resist flexure (and optionally, both shear and torsion as well), and is required. The ‘Shear Section’ contains the section that will be used to resist shear. The ‘Torsion Section’ contains the section that will be used to resist torsion. If you select either of the options to use the flexure section for shear/torsion capacity, the corresponding tab will be hidden.
Flexure Section
You can have two or more solid polygons (you must have at least one solid polygon here). You can also have one or more blockouts. Both the section properties and the sketch will update in real time.
Shear Section
The shear section starts with a ‘best guess’ as to what is intended for the shear resistance section. It will initially be part or all of the original flexure section. You may keep this section, or you may complete revise it.
Torsion Section
The torsion section starts with a ‘best guess’ as to what is intended for the torsion resistance section. It will initially be part or all of the original flexure section. You may keep this section, or you may complete revise it.
Fillets and Chamfers
Fillets are assumed to be segments of circles, so you will be prompted for a radius. Chamfers are assumed to be triangular, so you will be prompted to input a leg length. Fillets and chamfers at a corner where the external angle is less than 180 degrees will add area where if the angle is greater than 180 degrees they will remove area.
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