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You need to have duplicate nodes wherever you connect a brick element to a zeroLength element (so you will actually have 3 nodes in the same location, 1 for the brick element and 2 for the zeroLength element). The node for the brick element needs to have 3 DOF and the two nodes for the zeroLength element need to have 6 DOF. Then you need to use the equalDOF command to connect the translational DOF of the brick element node to the translational DOF of one of the zeroLength element nodes.