Distributed Coupling in Abaqus

Hi all,

I am trying to replicate an analysis done in Abaqus by using LS Dyna. I've an input(inp) file of the abaqus model on which the analysis has been performed.

It involves a distributed coupling load case - where a concentrated load is applied on the "reference node" and as it is coupled with the "coupling nodes" so that the load gets distributed on them. I dont see any mass/inertia assignment to the reference node. In fact it is not located on the geometry/body of the the structure in the model. The reference node has been defined only in the assembly definition. So the coordinates are known.

I tried to create the node at the same location and applied the concentrated load on the same point and used the *constrained_interpolation option to couple the reference node with the coupling nodes. But dyna doesn't run the analysis saying there is no mass assigned to the node where the load is being applied :(

Can someone help me fix this issue

Thanks and Regards
Bharath