In ABAQUS, if we define 5 equation constraints such that we restrain 2,3,4,5,6 degrees of freedom, shouldn't the U2, U3, UR1, UR2, and UR3 for the nodes be equal given that Poisson's ratio is 0?
If you specify the equation constraint in the form of: U1_node1-U1_node2=0 then U1 for both nodes will be equal. And of course you can define multiple equation constraints for several degrees of freedom.