You have not created the Axisymmetric model you want. It should be a radial slice that is revolved around the Y-axis to create the solid body.

What you have drawn is this:

When I rotate that around the Y axis, this is the model that you are simulating in ANSYS.

I said that the axis of the rod goes on the Y-axis. You haven't done that.

You have applied the displacement to the entire rod body when you picked the face of the rod. That does not allow the rod to stretch. You need to apply the displacement to the top edge of the rod. Also, put in a much smaller displacement.

I recommend you make the elements on the rod the same size as the elements on the concrete.