EN 1991-4 Actions on structures – Silos. Pressures on conical hopper

disladisla
Hi,

I’m unable to apply my custom loads to a conical hopper using Traction (Pn and Pt according to picture).
I checked the formulas in other conditions, and they respond properly.

- Applied to the shell works fine. Symmetric result and forces are in balanc.
- Looking the result of the formula with a temperature field works fine (No undefined values or directions)
- Arrows looks good and pointing in the right directions.

When I try to apply it to the cone it fails.

Any idea what could be wrong?

https://we.tl/t-vaaqXMXdkt



Regards

Comments

  • disladisla
    From Mecway Manual:

    "On a shell element, the face is offset from the midsurface by half the element thickness so a traction applied to the face generates moments at the nodes as well as forces.
    If you don’t want these moments, apply it to the elements instead of the faces. Then it acts on the midsurface. You should always do this for curved shells with the CCX solver because those moments usually include a normal component which isn’t allowed by CCX."

    I have try to apply the traction to the elements and it works. :) The problem probably is on the moments introduced into the sloped shells.
  • AndreaAndrea
    Hi!
    Hi had a little experience with silos and I encountered problems with leg joints, wind and local buckling (EN1991-EN1998 loads for seismic actions). Less problem with discharge loads, but could depend from type of bulk material.
    If you are working on a complete project let me know
    Regards



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