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Torsional constant for noncircular sections

Jan 14, 2016 at 3:49 PM
calculating Torsional constant J as polar moment of inertia is valid only for circular sections, but for other sections, J has a different implementation
You can see an implementation here
https://github.com/rforsbach/Treu-Structure/blob/master/Sections/FemCrossSection.cs
Coordinator
Jan 15, 2016 at 7:10 PM
Hi,
Thanks for information.
Is there any other formulations that do not need numerical integration over section of element?
Jan 17, 2016 at 1:35 PM
Sorry for late reply;
There's no explicit formula for any section with known set of coordinates. Integration over a finite element meshed section will find it.
Meanwhile, this pdf contains a full explanation and precalculate torsional constant J for some sections.
This can be useful, something like, SectionGenerator.GetBoxSection(/ paramertes /) ..etc
Marked as answer by epsi1on on 1/17/2016 at 10:28 AM
Coordinator
Jan 17, 2016 at 6:27 PM
Edited Jan 17, 2016 at 6:27 PM
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Thank you for information
Coordinator
Mar 25, 2016 at 10:06 AM
MohamedSalah wrote:
calculating Torsional constant J as polar moment of inertia is valid only for circular sections, but for other sections, J has a different implementation
You can see an implementation here
https://github.com/rforsbach/Treu-Structure/blob/master/Sections/FemCrossSection.cs
Which line number is implemented the J parameter?
Mar 27, 2016 at 11:33 PM

Theoretically, I'm not sure what he did.

From what I can see, J is calculated at the end of torsionBvp method.