Slab Thickening

[Anonymous]

Hello!

I am modelling a 650 raft foundation that has a 1600 deep section for a crane base, and am unsure the best way of modelling it? When I thicken it seems to create a discontinuity of moments at the edge of the thickening. I think this might be because Robot assumes the centre of the two thicknesses is the same and not the top of the slabs? Is there a way to offset the thicker slab to get the top of the slabs to line up and will this help?

The deflection is continuous at the boundary so the different thicknesses seem to be acting as one in some ways

As always, thanks for your help

[Rafal.Gaweda]

I am modelling a 650 raft foundation that has a 1600 deep section for a crane base, and am unsure the best way of modelling it? When I thicken it seems to create a discontinuity of moments at the edge of the thickening. I think this might be because Robot assumes the centre of the two thicknesses is the same and not the top of the slabs?

Yes, it is like that

Is there a way to offset the thicker slab to get the top of the slabs to line up and will this help?

create this panel below the thin one (in its opening) and connect edge nodes of this thick panel and nodes on opening edges by rigid links

[Anonymous]

Ok, thanks for your suggestion.

But how do I create the panel below? Do I offset one or define a new storey under the raft?

[Rafal.Gaweda]

But how do I create the panel below? 

Copy existing one below, assing Opening to the one in plate, connect nodes by rigid links.

[Anonymous]

Thanks Rafal,

Not sure what you mean this though?! Would it be possible to send through all the steps I shoudl follow?

Thanks

[Rafal.Gaweda]

Example movie : http://screencast.com/t/jbgUunsg

[Anonymous]

Many Thanks!

Will this properly replicate the increased stiffness of the thickened concrete?

[Rafal.Gaweda · Accepted solution]

Moved down panel should have 1600 thickness and of course translation vector should be correct.

I have not paid attention to these in movie example. I just wanted to show you the way of doing that.