How to define the load that is variable along the perimeter

manchild

Hi,
What is te fastest way to define load on surface on cylindrical tank but variable along the perimeter ?

manchild

Victor

You can specify pressure as a function of position (x,y,z). So if you can express your pressure distribution as a mathematical formula (possibly piecewise) then enter that in the pressure load. Part of this formula would include calculating angle from the rectangular coordinates.

manchild

Ok. I got formula.
I should just type it in pressure loads (normal to the surface) ?

Victor

Great. Changes you'll need to make are:

• No variables so you have to explicitly enter the values of d_c and H
  
• No curly brackets. Use round brackets.
  
• Dot for decimal point instead of comma
  
• Only enter the right-hand-side with no equals sign
  
• Use * for multiplication, not nothing
  
• Replace θ with atan2(y,x) if that's angle in the x,y plane
  

For further reference on formulas, click the little "(?)fx" button next to the input.

disla

Hello,

I remember working on this some time ago.
I have rescued some formulas and attach example. If I'm not wrong that profile belongs to EN 1993-4. Anex C
I have substitute dc/H by Pi number for you to easily identify it and also cylindrical stress and strain formulas are included. Base is pinned.
You can extend the formulation with the change in height.
Ccx Pardiso is 4sec to compute.

manchild

Thank guys (Victor and Disla) your advice was very helpful.
Disla you are right it's 1993-4, thanks for the example, it helped me a lot