Hello,
Please try also with beam elements of ELFORM 1 and 3.
*BOUNDARY_PRESCRIBED_MOTION with VAD=1 will prescribe the acceleration at the node. You will need to prescribe the acceleration only at the node of the base (node 1). The total result at node 2 will be (motion at the base) + (motion at node 2 relative to the base).
LOAD_BODY applies the inertia force due to the base acceleration. In this case, node 1 should be fixed. The response at node 2 will be the motion relative to the base. To simulate the response due to base acceleration, we usually use this approach.
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