*HEADING
360 DEGREES MODEL CORRESPONDING TO 1X2 MESH OF SC8R ELEMENTS
*PREPRINT, ECHO=YES, MODEL=YES, HISTORY=YES
*NODE
      1,         -30.,           0., -0.5
      2,           0.,          30., -0.5
      3,           0.,          50., -0.5
      4,         -50.,           0., -0.5
      5,         -10.,           0., -0.5
      6,           0.,          10., -0.5
      7,           0.,         -30., -0.5
      8,           0.,         -50., -0.5
      9,           0.,         -10., -0.5
     10,          30.,           0., -0.5
     11,          50.,           0., -0.5
     12,          10.,           0., -0.5
    101,         -30.,           0., +0.5
    102,           0.,          30., +0.5
    103,           0.,          50., +0.5
    104,         -50.,           0., +0.5
    105,         -10.,           0., +0.5
    106,           0.,          10., +0.5
    107,           0.,         -30., +0.5
    108,           0.,         -50., +0.5
    109,           0.,         -10., +0.5
    110,          30.,           0., +0.5
    111,          50.,           0., +0.5
    112,          10.,           0., +0.5
*ELEMENT, TYPE=SC8R
1, 1, 2, 3, 4, 101, 102, 103, 104
2, 2, 1, 5, 6, 102, 101, 105, 106
3, 7, 1, 4, 8, 107, 101, 104, 108
4, 1, 7, 9, 5, 101, 107, 109, 105
5, 10,  7,  8, 11,  110,  107,  108, 111
6,  7, 10, 12,  9,  107, 110, 112, 109
7,  2, 10, 11,  3,  102, 110, 111, 103
8, 10,  2,  6, 12,  110,  102, 106, 112
*ELSET, ELSET=EALL, GENERATE
1, 8, 1
*NSET, NSET=NBC
  5,  6,  9, 12
  105,  106,  109, 112
*SHELL SECTION, ELSET=EALL,MATERIAL=MAT
 1., 
*MATERIAL,NAME=MAT
*ELASTIC
10E8,0.3
*DENSITY
100, 
*STEP
*FREQUENCY, EIGENSOLVER=LANCZOS
12,
*OUTPUT, FIELD, FREQUENCY=0
*END STEP