You mau choose any node to get the load-displcacement curve. node would not matter they all follow the same constitutive law only the level of loads will be different. Try it with two node then you will see.

I hope it answers your question.

Hi everyone.

I have 3D model and I want to get th L-D curve. If the model has many nodes and element, what should I do the get the load that I need to get the accurate Load-Displacement curve?

Thanks