Pre-defined beam sections orientation is wrong

[mec]

Hello everybody. Probably there is  a seriuos problem on the 3D visualization of pre-defined sections of beams. The orientation of the sections shown  in results environment if you set the 3D visualization seems to be wrong. If you use this visualization to check and correct the orientation of the beam sections of your model you may incurr in serious errors. The problem seems to happen only on pre-defined sections, if you create a section with user defined option it is shown correctly.

Am I wrong or is it a software problem?

Thanks

[AstroJohnPE]

Hi mec,

Can you provide some more details, such as

1. What version of Simulation Mechanical are you using?
2. What cross-section are you using? (which database and shape)
3. What's the orientation of the line? (aligned with X, Y, Z axis, or something else)
4. What surface number is the line drawn on? Or if you defined an orientation node, what are the coordinates of it?
5. Just to be clear, have you confirmed that the displacement is correct (meaning the inertias are oriented properly), and the problem is only with the 3D visualization?

Thanks.

[mec]

Hi John, I attach a simple model to view the problem. You can check that part 2, whose section is user defined, has the same orientation in FEA editor and in results, while part 3 whose section has been taken from DIN library has 2 different orientations in FEA editor and results. In more detail the element definition shows that the maximum inertia is around I2 axis while the graphic result shows that the beam is not oriented accordingly. I am using Simulation 2016 SP2. The problem seems to be only the 3D visualization. Thank you Carlo Fazzini

[Andrew.Sartorelli]

Hi Carlo,

Thanks for posting this feedback, I'm investigating the issue. From your description it sounds like the visualization is incorrectly oriented, but the results are OK, is this correct?

Regards,
Andrew

[mec]

Yes it is correct. Thank you and regards Carlo Fazzini

[Andrew.Sartorelli]

Hi Carlo,

Which cross-section are you having a problem with? I did a simple test with a DIN I 80 and the manually created one appeared the same as the one from the library.

Thanks,

Andrew

[mec]

Andrew,



please see the attached model and email. I find differences between the
orientation of the beams in FEA editor and results as described below.



Thank you and regards



Carlo Fazzini

Oggetto: Re: Pre-defined beam sections orientation is wrong



Hi John,



I attach a simple model to view the problem. You can check that part 2,
whose section is user defined, has the same orientation in FEA editor and in
results, while part 3 whose section has been taken from DIN library has 2
different orientations in FEA editor and results. In more detail the element
definition shows that the maximum inertia is around I2 axis while the
graphic result shows that the beam is not oriented accordingly.

I am using Simulation 2016 SP2. The problem seems to be only the 3D
visualization.



Thank you



Carlo Fazzini

[AstroJohnPE]

Hi Carlo,

Your attachment apparently did not attach. But regardless, I confirmed that the 3D visualization is wrong for one of the shapes in each of the databases Australia, Canada, DIN, Europe, and Japan.

See the discussion "Frame deflection problem - beam models" for more details.

[Andrew.Sartorelli]

Thanks for the information and fast responses! I ran some tests earlier this morning and I noticed the issue by using the beams in a cantilevar situation. I've escalated the issue to the development team to get resolved.

Thanks,

Andrew

[Andrew.Sartorelli · Accepted solution]

Hello,

Earlier today we released Hotfix SIM16201 for the issue of Section Modulus and Moment of Intertia being transposed for non-AISC beam cross-sections. Thank you again for bringing this issue to our attention.

Regards,

Andrew