Solid Structure - REsults

[Anonymous]

Hello!

Could you please help with inetrpretation of results - pdf attached. The primary direction 1 and 2, are they flexural stresses or bearing stresses in concrete? I'm not sure how to read these results. I also attach cut trough for clarification. Thanks.

[Pawel.Pulak · Accepted solution]

s1, s2 and s3 are not flexural stresses nor bearing stresses.

These are principal stresses - see: http://docs.autodesk.com/RSA/2013/ENU/filesROBOT/GUID-55FF4C33-8C07-44B7-ABD5-8DC0A3B97C7A.htm

The direction of for instance s1 can be different in each point of solid so it is rather impossible to describe it as bearing or flexural stress.

Stresses from Detailed tab correspond more to bearing or flexural ones. Of course in such case it depends on proper selection of coordinate system. In cylindrical solid as yours the recommended coordinate system would be Cylindrical with global Z as vertical axis. In such case sXX would be radial stress (corresponding to flexural effects in your model), sYY circumferential stresses and sZZ vertical stresses (corresponding to bearing stresses in your model).

It is important to notice that the support of your model is the line support along the bottom edge of the cylinder. It is not a surface support so its area is zero. In such case the theoretical value of bearing pressure is infinite. FEA of Robot will give some finite value because of discretization.

Mohr's circles for 3D state of stresses, illustrating s1, s2 and s3, are given in message 4 of this post:

http://forums.autodesk.com/t5/Autodesk-Robot-Structural/Stress-analysis/m-p/3779237/highlight/true#M...

s(1-2), s(1-3), and s(2-3) stresses correspond to radii of these circles

[Anonymous]

Thanks. That's helpful.