Swimming pool/Sand/Reinforced concrete shell

[harry_boyer]

Hello,

I'm new to Robot and my aim  is to model the following case :

An 8m x 3m and 1.5m deep swimming pool is inside a 9m x 4m 2m deep reinforced concrete shell, with the concrete shell placed directly on the ground.
Between the pool shell and the reinforced concrete shell, there is 50cm of sand, as well as between the bottom of the pool and the ground.

While I've seen how to model a reinforced concrete pool or a retaining wall, I'd appreciate your advice for this case, for which I haven't found much information

[Rafacascudo]

Swimming pool material is plastic/ fiber glass?

[harry_boyer]

Yes, 10 mm fiber glass. 

[Rafacascudo · Accepted solution]

Model the shell box(9x4x2m) , apply the sand+pool+water weight on the bottom slab.

Not sure on how to consider the "sand wall" + water pressure effect on the RF shell walls. Maybe you will need to ask a soil guy

[harry_boyer]

Thank you. My problem is effectively to model the transfer of the water pressure through the sand and to the RC wall. 

Manually or other tools as soil softwares (GEOMUR for example), in 2D, I can find the stress diagram applied to RC wall. Do you know if there is a way to take into account a specific stress diagram ?

I read also that another way woud be to model the sand as a volumic object. Any idea ? 

[Rafacascudo]

Maybe using volumetric FE , but not in Robot as there are no nonlinear materials available to be used.

Can't help you the stress profile due to sand-water interaction.

[harry_boyer]

Thanks Rafacascudo to your input (specificly "ask a soil guy"), I remembered that French NF P94 281  and 282 (associated with EC7) explains in detail models of soil load transfer to walls and retaining screens. Among different cases, attached file gives a partial example (not with all associated formulaes).
Then, by splitting the different component of the encoutered load in my case, I should be able to model the effect of swimming pool and sand on the shell.

This is possible thanks also to Robot allows to define surface loads defined by 3 points and geometrical limitations on loads.