*HEADING
: FOUNDATION TYPE F  [M3D4]
*PREPRINT,ECHO=YES,HISTORY=NO,MODEL=NO
*NODE,NSET=ALL
 1,0.,0.
 3,7.,0.
 7,0.,7.
 9,7.,7.
*ELEMENT,TYPE=M3D4, ELSET=EALL
 1,1,3,9,7
*MATERIAL,NAME=A1
*ELASTIC
 3.E+6,0.3
*FOUNDATION
 1,F,300.
*MEMBRANE SECTION,MATERIAL=A1, ELSET=EALL
 2., 
*STEP,PERTURBATION
*STATIC
*BOUNDARY
 ALL,1,2
 ALL,3,,-0.1
*OUTPUT,HISTORY,FREQUENCY=1
*ENERGY OUTPUT,VARIABLE=PRESELECT
*OUTPUT,FIELD
*NODE OUTPUT
RF,
*EL PRINT,FREQ=0
*NODE PRINT
 RF, 
*END STEP