Somesh,

In PV Elite there are two options for basering design and they are the Simplified Method and the Neutral Axis Shift method. For the normal scenario of concrete to steel, PV Elite can move the neutral axis utilizing "text book" methods. This action will generally (but not always) help reduce the concrete load and consequently the basering thickness, especially when the vessel has a high moment load.

The other option is the simplified method. In this case, there is no shifting of the neutral axis and the concrete strength parameters are not used in the analysis. You can create a simple model and make a few different runs, being sure to change the concrete strength values each time. You should notice that the required basering thickness does not change between each iteration.

Then of course as Stan mentioned above, you will have to do some hand calculations to insure the chosen weld size is adequate to handle all of the mechanical loadings on the attachment weld.