*HEADING
: EIGENVALUE ANALYSIS OF AN UNCONSTRAINED 1-ELEMENT MESH  [B23]
*NODE,NSET=NALL
 1,0.
 2,5.,2.
*ELEMENT,TYPE=B23, ELSET=EALL
 1,1,2
*BEAM SECTION,SECTION=PIPE,MATERIAL=A1, ELSET=EALL
 10.,1.
*MATERIAL,NAME=A1
*ELASTIC
 30.E6, 
*DENSITY
7.5E-4, 
*STEP
*FREQUENCY, eigensolver=lanczos
5, , ,-1.0E4
*END STEP