Equivalent Torsional Constant for two rectangular beam in parallel
Equivalent Torsional Constant for two rectangular beam in parallel
(OP)
Hi,
I have looked through all the forums and didn't find the answer to my question.
If I have two rectangular cross-section beams which work in parallel against torsion. I want to model them in Patran using a single beam with equivalent properties. This is easy to do for Inertia properties, but how can I calculate the equivalent Torsional Constant (J in Patran, K in Roark)?
I have looked in Roark, but haven't found anything, though some formulas seems to indicate that simply adding the J properties seems to be the way to go...at least for thin wall beams,but nothing for plain rectangular or round beams.
Do you guys have any clues and/or reference for that situation?
Thank you very much!
I have looked through all the forums and didn't find the answer to my question.
If I have two rectangular cross-section beams which work in parallel against torsion. I want to model them in Patran using a single beam with equivalent properties. This is easy to do for Inertia properties, but how can I calculate the equivalent Torsional Constant (J in Patran, K in Roark)?
I have looked in Roark, but haven't found anything, though some formulas seems to indicate that simply adding the J properties seems to be the way to go...at least for thin wall beams,but nothing for plain rectangular or round beams.
Do you guys have any clues and/or reference for that situation?
Thank you very much!





RE: Equivalent Torsional Constant for two rectangular beam in parallel
Though if you have 2 beams why would you want to model them as one??
Without further details it is hard to establish you probelm, though if i imagine 2 beams parallel to each other and applying a rotation about the centre point between them (there shear centre) i would expect that you could simplify the problem to a couple applied to both beams, as they act independently to each otherabout a central axis. Though its a Friday night and (once again) i have had just a bit to much wine.
RE: Equivalent Torsional Constant for two rectangular beam in parallel
Anyhow, you are probably right about modeling the two beams. It is more trouble but it solves the question. Still, some times, a cross section might contain a hole, so there is two separate areas and I would still need to find an equivalent Torsional Constant for those two sections.
RE: Equivalent Torsional Constant for two rectangular beam in parallel
http://www
Please go there to participate in the discussion as it seems a better place to discuss this topic.
Thanks,