*INCLUDE, INPUT=all.msh
*INCLUDE, INPUT=fix.nam
*INCLUDE, INPUT=mid.nam
*INCLUDE, INPUT=interface.nam

*MATERIAL, Name=MAT
*ELASTIC
  25.e+6, 0.47
*DENSITY
  1250.
*SOLID SECTION, Elset=Eall, Material=MAT
*AMPLITUDE,NAME=AMP1
 0.,0., 10.e-3, 1.
*STEP,NLGEOM, INC=100000000
*DYNAMIC, DIRECT
 1.0e-07,1.e+5
*RESTART, WRITE, FREQUENCY=1
*BOUNDARY
  Nfix,1,3,0
*CLOAD, AMPLITUDE=AMP1
 Ninterface, 1, 0.0
 Ninterface, 2, 0.0
 Ninterface, 3, 0.0
*DLOAD, AMPLITUDE=AMP1
*INCLUDE, INPUT=top.dlo
*NODE FILE, FREQUENCY=100
  U
*NODE PRINT, NSET=Nmid, FREQUENCY=100
  U
*END STEP