topic Re: shifted column on retaining wall in Robot Structural Analysis Forum

shifted column on retaining wall

me1205377 — Tue, 07 Nov 2017 07:13:54 GMT

Greetings, please advice on the following case

i have a retaining wall that carry a column starting from ground floor , the column is shifted 5 cm from the centre of the wall and i want to make this in my model.

so is this is the best way to model it ? or should i make the column start from the bottom of the retaining wall? is a one rigid link between 2 nodes is enough to mimic the real case or more rigid links are needed ?

Also regarding the design is it possible to design this retaining wall in robot

your suggestions are highly appreciated

Re: shifted column on retaining wall

Artur.Kosakowski — Tue, 07 Nov 2017 07:23:47 GMT

Hi @me1205377

IMHO the best way to model the offset is to use rigid links. Unless your retaining wall is just a wall of a building being under the ground level so that it boundary conditions are a foundation at its bottom and a slab at its top modelling it in a general FEM program will be tricky as you relay on the equilibrium of forces to secure the wall stability rather than supports.

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Re: shifted column on retaining wall

me1205377 — Tue, 07 Nov 2017 07:56:23 GMT

the top slab is not resting on soil, it the ceiling of the basement behind the indicated retaining wall

i am sorry i couldn't understand the situation you described

i made the offset with one rigid link. i added a node to the retaining wall top side and made it the master node, the slave node was the column bottom node , all degrees of freedom are locked is this enough ?

also regarding the design of such wall, is it possible in robot

Re: shifted column on retaining wall

Artur.Kosakowski — Tue, 07 Nov 2017 08:01:25 GMT

Hi @me1205377

Could you attach the cross section through the wall so that I could better understand the situation?

Re: shifted column on retaining wall

me1205377 — Tue, 07 Nov 2017 08:22:42 GMT

Re: shifted column on retaining wall

Artur.Kosakowski — Tue, 07 Nov 2017 08:33:33 GMT

Hi @me1205377

IMHO you can design this wall in RSA as it is more a basement wall rather than a retaining wall. For calculations of reinforcement I'd use RC Slab approach (for you have out of the plane bending) as explained during the 5th Robot webinar. I think that the definition of the rigid link as you described it is fine.

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Re: shifted column on retaining wall

me1205377 — Tue, 07 Nov 2017 08:38:31 GMT

just for my info what is the difference between a basement wall and a retaining wall

for the :basement wall" i will define it as a panel not a wall with shell calculation model correct ?

Re: shifted column on retaining wall

Artur.Kosakowski — Tue, 07 Nov 2017 08:45:36 GMT

Hi @me1205377

just for my info what is the difference between a basement wall and a retaining wall

for the :basement wall" i will define it as a panel not a wall with shell calculation model correct ?

Correct.

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.