*HEADING
: EIGENVALUE ANALYSIS OF AN UNCONSTRAINED 1-ELEMENT MESH  [PIPE21H]
*NODE,NSET=NALL
*ELEMENT,TYPE=PIPE21H, ELSET=EALL
*BEAM SECTION,SECTION=PIPE,MATERIAL=A1, ELSET=EALL
 10.,1.
*MATERIAL,NAME=A1
*ELASTIC
 30.E6,
*DENSITY
7.5E-4,
*STEP
*FREQUENCY, eigensolver=lanczos, SIM=NO
6, , ,-1.0E4
*OUTPUT,HISTORY,FREQUENCY=1
*MODAL OUTPUT
*END STEP