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# Flat plate/flat slabs with CADRE

## Flat plate/flat slabs with CADRE

(OP)
Hi,
I'm trying to analyze a 2 way flat slab floor with Cadre FEA. I'm trying to convert the stresses into bending moments but the values seem very low, about 1/2 ft-kips, for example. I should be getting something along the magnitude of 195 ft-kips by calculating the static moment as 1/8 wu l1 ln2^2. I am converting the stresses to moments using the following formula: max stress at the plate surface= 6Mx/t^2, where t is the plate thickness. I can't figure out what I'm doing wrong. Does any one have an example (.fem file) of a flat slab analyzed with Cadre?
Thanks,
Jack

### RE: Flat plate/flat slabs with CADRE

Send Cadre an email direct.  I have had astounding sucess doing this!!

### RE: Flat plate/flat slabs with CADRE

Hi Jack,

Are you calculating a concrete slab? In a slab, the formula for calculating the bending moment is:

Moment = stress * thickness^2/6

Where moment is per unit length. The results are perfect.
In the last releases you can also control the traverse shear:

Shear = Tpz * thickness

Where Tpz are the absolute values of the traverse stress (see the help); it is not so easy to calculate the trasverse shear using DKT elements but Jim solved the matter.

Marco (Italy)

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