Question about beam calculation with calculix

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thschrader
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Re: Question about beam calculation with calculix

Post by thschrader »

Hi Bernd,
my old FC0.17 dev-snapshot uses ccx-version 2.12 from FC ..bin/folder.
ccx_2_12.JPG
ccx_2_12.JPG (32.14 KiB) Viewed 1243 times
Here is another test example.
frame_test_1D.FCStd
(124.69 KiB) Downloaded 46 times
3x4 m frame, rectangular profile 100x60 mm, material calculix-steel.
On FC0.17 not possible to get vertical tangent at fixings for deflection line.
On newest FC0.19 dev-snapshot it works (with new ccx in /bin folder)
thschrader
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Re: Question about beam calculation with calculix

Post by thschrader »

I forgot a pic...
frame_1D.JPG
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bernd
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Re: Question about beam calculation with calculix

Post by bernd »

On which ccx version does it give the correct ones?
thschrader
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Re: Question about beam calculation with calculix

Post by thschrader »

bernd wrote: Sat Jan 11, 2020 8:13 pm On which ccx version does it give the correct ones?
ccx2.15 gives good result for beam-test from ickby (z-deflection 0,37 mm).
frame-deflection is too high, calculated 6 mm, should be approx 2 mm.
done with
OS: Windows 10 (10.0)
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19.19181 (Git)
Build type: Release
Branch: master
Hash: 2504247d65271b937dd5f033a0efff9c0d7bf375
Python version: 3.6.8
Qt version: 5.12.1
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: German/Germany (de_DE)
result_beam_frame_ccx2_15.JPG
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Kunda1
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Re: Question about beam calculation with calculix

Post by Kunda1 »

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hhassey
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Re: Question about beam calculation with calculix

Post by hhassey »

Is it possible in a beam analysis, to obtain internal forces? (Normal force, Shear force, Bending Moments) These are what we use for construction structural analysis.

Can we have a beam section other than rectangular or circular?

Thanks
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NewJoker
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Re: Question about beam calculation with calculix

Post by NewJoker »

hhassey wrote: Thu Aug 11, 2022 5:51 pm Is it possible in a beam analysis, to obtain internal forces? (Normal force, Shear force, Bending Moments) These are what we use for construction structural analysis.
Yes, but you have to add the SECTION FORCES parameter to the *EL FILE keyword in the .inp file.

hhassey wrote: Thu Aug 11, 2022 5:51 pm Can we have a beam section other than rectangular or circular?
FreeCAD supports rectangular, circular and pipe sections. CalculiX offers also elliptical (its special type - circular - is available in FreeCAD), box and general sections. The last one allows you to define an arbitrary profile by providing its area, moments of inertia and Timoshenko shear coefficient. However, there's still one known bug associated with it so it has to be used carefully.
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