modeling a bottom nozzle on plate tank - nozzle stiffness

Hi,

I am modeling a nozzle, which is at the bottom of a plate tank, which is 6mm thick.

I have modeled it as a pinned connection. i.e restraining that in X,Y, Z and RY with c-node. so that it will give me reactions in these directions. Is this a preferble method?

How I can calculate stiffness in X Y and Z direction. Is there any approximate method. or only FEM shall be used for this.

Since this is 30' tank with a flat bottom, so linear stiffness in Y direction can be calculated using formula : P/&l = AE/L
using L= thickness of shell?

is this the corerect way to approximate.

Rest I think X and Z lateral stuffness will be quite less as ratio of A/L will decraese dramatically. any comment..

Thanks

There are no methods built into c2 to determine the stiffness of this configuration.

pinned?- No.
low X Z stiffness? - No.

Regards,