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The displacements of the model on the sides at the level of the dense sand and the loose sand layers are fixed with periodic boundary conditions; each side has the same displacement with the other side. The command below ties the first and the second degree of freedom (DOF) of elements 58 and 4148.
equalDOF 58 4148 1 2
The nodes on the Yolo Loam level are connected at first with nodes with the same coordinates (representing the laminar box) with ENT zeroLength elements and, these nodes are connected with equalDOF objects with nodes on the other side of the box (periodic boundaries).