Flat Bar Section Extensions
Tips & Tricks
The cross‑section properties program SHAPE‑THIN provides convenient options for graphically setting the section reinforcements. When modeling flat bar extensions, you should note one rule only: The length of the element must be greater than the width.
You can use the “Welded Sections” of the cross‑section library to define the flat bars by the parameters b and d. It is important to define the width 'b' greater than the thickness 'd' in accordance with the cross‑section schema. Only in this way, it is ensured that the element thickness is used correctly in the equations. For example, the thickness with the third power affects the determination of the torsional constant.
If the reinforcement is arranged vertically as shown in the figure, the flat bar has to be defined with b → d as well. Before setting the parameters, you can rotate the flat bar by 90° in order to bring it to the correct position.
Of course, it is also possible to define the flat bar as a normal element by specifying the start and end nodes.
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Cross-Section Properties Software
Section properties, stress analysis, and plastic design of open and closed thin-walled cross-sections