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Post your complete input script, without that it's difficult to solve your problem.

You are not getting any results because your braces are not connected to the top chord, you have two zero force members. Instead of one element from node 2 to 3, you should try an element from node 2 to 5, and node 5 to 3. If you do that your braces will no longer be zero force members.

Check your BeamContact2D inputs. Your slave and Lagrange multiplier nodes should be -ndf 2. From the looks of it, they are -ndf 3 nodes.

http://opensees.berkeley.edu/wiki/index ... mContact2D