19 August 2019

FAQ 003499 EN

Gerhard Rehm

Add-on Modules

SHAPE-THIN

I check the cross-section properties of rolled cross-sections in SHAPE‑THIN and had to find out that there are discrepancies with the tables when determining the torsional constant It. How can this be explained?

Answer

When determining the torsional moment of inertia, point elements are not considered for It in the analytical equations. Therefore, it is possible to apply a correction factor for cross-sections with distinct fillets, such as rolled cross-sections, to determine the effect of the point elements. Figure 01 shows recommendations for various types of the rolled cross-sections. This correction factor can be adjusted in the calculation parameters. Furthermore, it is also possible to calculate the torsional constant by using the FE method, which also covers the effect of point elements and welds. This approach requires slightly more computing time than the analytical calculation.

Keywords

Torsional constant Correction factor Deviation

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