*HEADING
 B21 with *BEAM ADDED INERTIA 
 1. Frequency extration
*preprint,model=yes,history=yes,echo=yes
*NODE,NSET=NALL
   1,  0.,   0.
  11,  0., 300.
*NSET,NSET=TIP
 11,
*ELEMENT,TYPE=B21,ELSET=BEAM
 1, 1,11
*BEAM SECTION,SECTION=CIRC,MAT=MAT,
ELSET=BEAM,ROTARY INERTIA=EXACT
 3.,
 0.,0.,-1.
*BEAM ADDED INERTIA
169646.0031, 0.,0., ,381703.50741116,
*MATERIAL,NAME=MAT
*ELASTIC
 30.E8, 
*DENSITY
 80. 
*BOUNDARY
 1, 1,2
*ELSET,ELSET=EALL
 BEAM,
*BOUNDARY
 1, 6,6
*STEP,NLGEOM
 FREQ 1
*FREQUENCY
 3,
*END STEP