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Shell Joints - No rotational stiffness

I am evaluating Femap for creating shell structures that are idealised as having no rotational stiffness at the shell joints. I would like some guidance on how this can most easily be achieved using Femap tools. I would like to use spring elements to join the panel edges so that I can also specify a joint stiffness (per unit length).

My problem is illustrated by the following example: Create a box shell structure with all six faces joined along their edges by spring elements of stiffness 5000 lbf/in.

Any advice would be greatly appreciated.