Retaining walls (FEM) and columns working together

[Anonymous]

Hello:
I have a question about RSA. I need to make an analytical model of a buried water tank. The structure can be seen in the following image. It is composed of walls and circular columns of reinforced concrete.

I need help on how to make the model in Robot so that walls and columns work together in their entire length.

I know that an eccentricity can be applied to the section of the column, but I do not know how to do that for the wall.

The final working section of the set is shown in the following image.

It is necessary to analyze the state of pressures of the soil with the empty tank (from outside to inside).
Thank you!

[Rafacascudo · Accepted solution]

1- Use bar offsets to set the columms in the correct position .

or

2- Place the bars in the correct position and link them to the wall mesh using rigid links ( create de bars , divide them using the same spacing you will use for the wall mesh size , copy the bar division nodes to the wall plane and then create the rigid links. Mesh the wall , freeze the mesh)

Both methods should give the same results

[Anonymous]

Thank you!
I'm going to try both solutions to analyze the results.

[Anonymous]

I have a question about each method.
In method 1, the only joint where the deformation between wall and column is equal, is the top joint?

In method 2, the column is divided into as many parts as there are finite elements in the panel, no? Can not be analyzed as an element with total length?

Thank you again.

[Rafacascudo]

Sorry, I did not understand the 1st question.

You don't need to divide the columm in several bars. You just need to create nodes along the bar lenght. The "divide..." tool allows you to do that ( create nodes without dividing the bar)

[Anonymous]

The question about method 1 is whether the deformation of the column accompanies the deformation of the wall along its entire length or if the linkage occurs only at the end of the column.
In the reference image, the deformation of column and wall, only coincide in the base and in the upper part of the column.

[Rafacascudo · Accepted solution]

The solid section representation of the bar element is not deformable. It is straight in your picture. If you divide it in more bars or use deformation plot from " diagrams for bars..." you will get a better picture of the bar deformed shape together with the wall

[Romanich]

Hi @Anonymous ,

As an off top, a short demonstration of the method 2 using Spider Pro attached.

[Anonymous]

Spider Pro is an add in for Robot?

[Romanich]

Yes it is

https://forums.autodesk.com/t5/robot-structural-analysis-forum/api-spider-the-multi-tool-with-rigid-...