hi, I have created hollow box section with 5m span, in results it is showing the deflection but there are no stress values, but if am creating a solid section stress are visible and values are matching with manual calculation, kindly help.
i am a new user so not able to attach the photos or file.
Note;While defining the section i am selecting solid section is it correct.
Please share the .pmx file, now you should be able to do it.
Yes, unless you have a surface geometry and use shell elements.
hollow section.pmx (7.7 MB)
It looks like you are trying to model simply-supported conditions and got stress concentration at the support locations. Have you seen this tutorial (check the comments for other BC ideas too) ? https://www.youtube.com/watch?v=XMNVtqrb3is
It’s a matter of proper boundary conditions but sometimes you may also ignore such stress concentrations and read the results away from the supports (the color legend can be adjusted to show colors in the all blue area too).
hollow section mod.pmx (2.3 MB)
got it, it was because of the boundary condition.
thank you for the time
hi, i have made box section and applied 0.01mpa load. the model works fine and the results are matching with the manual calculation.
some of the problems are
if i am making both side boundary condition U1 0 and U2 0 the results are fine but for the deflection i need to refer U2 results, as the whole structure moves the deflection in ALL is becoming 18mm
and if I make U1 U2 and U3 0 on one side and U1 and U2 0 on the other side to fix the structure no to move then the results are different.
There are four bearings at the bottom of the box and if i am defining supports at the bearing then the Von miss stress is getting concentrated at the bearing and the because huge stress profile variation 100mpa to 0.5mpa the diagram colour contour is becoming blue but the stress values matching ,
how to overcome these issues…
Thank you in advance https://limewire.com/d/P7VpR#4d61QaG1Ms
In the case of a section like this, you can use rigid body constraints to impose simply supported boundary conditions. Here’s an example: https://www.youtube.com/watch?v=z5IQuXv8A2Q
This way you could simulate pure bending if that’s the goal.
sorry i have shared the wrong linke
Ok, I see. However, I would still recommend the approach with rigid body constraints on the side faces if you want to simulate pure bending.
