*HEADING
  TEST BETA DAMPING WITH MODAL SUPERPOSTION            
*NODE, NSET=NALL
1,0.,0.
2,10.,0.
*ELEMENT,TYPE=T3D2,ELSET=TRUSS
1,1,2
*SOLID SECTION,ELSET=TRUSS,MATERIAL=MTRUSS
1., 
*MATERIAL,NAME=MTRUSS
*ELASTIC
1E7, 
*DENSITY
317., 
*STEP
*FREQUENCY, eigensolver=lanczos
1, , 
*BOUNDARY
1,1,3
2,2,3
*MODAL FILE
*END STEP
*STEP,PERTURBATION
*STATIC
*BOUNDARY
1,1,3
2,2,3
2,1,,1.
*PRINT,RESIDUAL=NO,FREQUENCY=5
*EL FILE,FREQUENCY=25
S,E
*EL PRINT,FREQUENCY=25,SUMMARY=NO
S,E
*NODE FILE,FREQUENCY=5
U,
*NODE PRINT,FREQUENCY=5,SUMMARY=NO
U1,V1,A1,RF1
*OUTPUT, FIELD, FREQUENCY=999
*NODE OUTPUT, NSET=NALL
U, 
*ELEMENT OUTPUT, ELSET=TRUSS
S,E
*OUTPUT, HISTORY, FREQUENCY=5
*NODE OUTPUT, NSET=NALL
U, 
*ELEMENT OUTPUT, ELSET=TRUSS
S,E
*END STEP
*STEP
*MODAL DYNAMIC,CONTINUE=YES 
 .01, 2.5
*MODAL DAMPING,RAYLEIGH
1, 1,   , 1.59248E-3
*SELECT EIGENMODES
1
*END STEP