Cylinder section modelling

Hello all

I wish to model structural mechanics in a section of a cylinder-like geometry consisting of longitudinal bars and radial rigid hoops supporting the bars. The full cylinder is too memory intensive to model an so I have drawn a section of the cylinder only. My question is: what contraints should be used on the end of the hoop sections to simulate the fact that they form a closed loop. I have tried a number of fixed constriants and prescribed displacement conditions but they do not result in reasonable solutions.

Any ideas?

Thanks a lot

Dan