Could there be a logical explanation why I am getting these asymmetries in deflection?

[yiviw97057]

I am looking at [-]Deflection(mm) after running calculations to find required reinforcement for slabs. However, in the middle I get asymmetries in the deflection cases, and I am not sure why. I tried to go through all the load cases I ran individually and look at Results - Maps - displacements for yy, but all cases looked fairly symmetrical compared to the picture below.

I also had to change all the load cases from SLS:CHR to SLS:QPR as suggested by a colleague, as otherwise I got unrealistic number. They said from previous experience that this helps somehow in Robot. 

Any suggestions would be much appreciated. 

[Romanich]

Hi @yiviw97057 ,

Please attach the model. However, based on your screenshot I would recommend to check the assigned code parameters.

[yiviw97057]

Thank you Romanich, I am not sure how comfortable I would be uploading it publicly, I could perhaps send it to your personal email. But nonetheless, could I ask what you mean by the assigned code parameters, is the link below what you're referring to?

https://knowledge.autodesk.com/support/robot-structural-analysis-professional/learn-explore/caas/Clo...

Or did you mean the design codes found under Job Preferences? Because they seem to be correct but I could triple check. Ive ran a lot of different combinations and they all made sense, it just seem to be this case when I run slab and shell reinforcement, and look at the [-]deflection.

[Romanich]

Hi @yiviw97057 ,

[yiviw97057]

Hi Romanich,

This is how mine looks. I am not sure what I should try; I tried to run with the highlighted red options "None", "For FE for which reinforcement As>0" and "For the whole panel", but I still get the same asymmetries in deflection. I am all out of ideas at this point, im open for any suggestions you might have. 

[Romanich]

Hi @yiviw97057 ,

It is hard to say what is going on without having the model (at least the shown part). By the way, it seems that you have a quite big cover and small rebars. What is the thickness of the slab?