Shell and solid

davefo · May 2019

can anyone shed some light on the correct way to model a reinforced concrete slab with holes in it.
attached are two models one using shells, the other using solids. The Z direction deflections are completely different as are the stress and moments.
Am I right in thinking that for comparison of the moments for the solid model moment are calculate by using the stress value * (the thickness of the slab)²/6

Thanks

barmin · May 2019

https://i.imgur.com/7mzb1pU.png Solid model has 150mm thickness while shell has 300mm https://i.imgur.com/gxOxA3l.png

davefo · May 2019

thanks it was supposed to be two part of 150mm

Victor · May 2019

As well as the thickness difference:

A ) Y and X BCs one two edges are missing in the shell model.

B ) All BCs on the solid model are on the edge of the plate's face, not the midplane like in the shell model.

Correcting those brings both models' displacements into agreement.

Mecway

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Shell and solid

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