*HEADING
ELEMENT TESTED      : B21
SLAVE SURFACE TYPE  : NODE
MASTER SURFACE TYPE : NODE
*PREPRINT, ECHO=YES, MODEL=YES, HISTORY=YES
*NODE,NSET=NALL
1, 50, 0
2, 25, 25
3, 0, 50
*ELEMENT,TYPE=B21, ELSET=EALL
1, 1, 2
2, 2, 3
*NSET, NSET=NSLAVE
 1,
*NSET, NSET=NMASTER
 3,
*SURFACE, NAME=SMASTER, TYPE=NODE
NMASTER,
*SURFACE, NAME=SSLAVE, TYPE=NODE
NSLAVE,
*BEAM SECTION,SECTION=PIPE,MATERIAL=MAT, ELSET=EALL
10.,1.
0,0,-1
*MATERIAL,NAME=MAT
*ELASTIC
10E8,0.3
*DENSITY
100, 
*TIE, CYCLICSYM, POSITION=0.5, NAME=TIE1
 SSLAVE, SMASTER
*CYCLIC SYMMETRY MODEL,N=4
 0,0,0
*STEP
*FREQUENCY,EIGENSOLVER=LANCZOS
10,
*OUTPUT, FIELD, FREQUENCY=0
*END STEP