Hello,
I want to model a "sandwich" wall which has two outer layers of thin reinforced concrete and a core layer of masonry. How can be done? the overall thickness of the wall is 6cm rc concrete (layer1)+ 50cm masonry (layer 2) + 6cm rc concrete (layer1), overall thickness 82cm. Should I go for volumetric structure instead of planar finite elements?
Kostas Bourmpakis
Solved! Go to Solution.
Solved by Artur.Kosakowski. Go to Solution.
I can think of 3 options:
1. Use a solid model
2. Use a shell model with 3 panels connected with rigid links
3. Use a shell model with a user defined orthotropic thickness
If you find your post answered press the Accept as Solution button please. This will help other users to find solutions much faster. Thank you.
Thank you Mr. Kosakowski for your answer.
It is difficult for me to understand the procedure for the following option:
3. Use a shell model with a user defined orthotropic thickness
I dont see any option in the user defined for modelling 3 layers as composite.
Additional help please?
Indeed such definition is not available directly but you may try to use this one instead:
If you find your post answered press the Accept as Solution button please. This will help other users to find solutions much faster. Thank you.
Sorry (it must be me) but I dont get it.
How I ll find and enter the following values for 3 layers with different material?
· membrane stiffness matrix D
· bending stiffness matrix K
· shear stiffness matrix H
Regarding the second solution of 3 panels connected with rigid links, is it enough with the rigid links on the border lines? does it calculate the material as continuous between the layers/panels? it performs as one element?
Finally what is a solid model. first time I ecounter it
Since i am struggling to cope with this task, could someone be so kind and provide me a brief guidance
or an example (if it exist) regarding the modelling of a 3 layer wall composed from 2 external layers of reinforced concrete
and an internal (core) of masonry. I didn't expect it to be so complicated....
Kostas
I don't have the exact formulas for the stiffness matrix for such type of sandwich wall. You may try to search the web for something like this:
http://contrails.iit.edu/digitalcollection/1968/AFFDLTR68-150article17.pdf
On the other hand you may also consider the following approach if you find it acceptable:
1. Create a composite profile in the Section Builder of Robot
2. Calculate its weighted properties
3. Define a new thickness with material and thicknness that matches the EA* value for the calculated section
4. Use the IY reduction to match EIz* value of the caclulated section
If you find your post answered press the Accept as Solution button please. This will help other users to find solutions much faster. Thank you.