*HEADING
 Basic verification for *COUPLING
 Test tributary area of surface with underlying element B21
*PREPRINT, MODEL=YES
*NODE, NSET=A
  1,  0.0000,  0.0,  0.0
  2,  1.2500,  0.0,  0.0
  3,  2.5000,  0.0,  0.0
  4,  3.2500,  0.0,  0.0
  5,  4.0000,  0.0,  0.0
  6,  4.5000,  0.0,  0.0
  7,  5.0000,  0.0,  0.0
  8,  5.5000,  0.0,  0.0
  9,  6.0000,  0.0,  0.0
 10,  6.7500,  0.0,  0.0
 11,  7.5000,  0.0,  0.0
 12,  8.7500,  0.0,  0.0
 13, 10.0000,  0.0,  0.0
*ELEMENT, ELSET=ELEM, TYPE=B21
 1, 1, 2
*ELGEN, ELSET=ELEM
 1, 12, 1, 1
*BEAM SECTION, SECT=CIRC, ELSET=ELEM, MATERIAL=ELASTIC
 0.5,
*MATERIAL, NAME=ELASTIC
*ELASTIC
 30e6, 0.3
*SURFACE, NAME=TOP
 ELEM, SPOS
*NODE
 9999, 5.0, 5.0, 0.0
*COUPLING, CONSTRAINT NAME=LOAD, REF NODE=9999, SURFACE=TOP
*DISTRIBUTING
*STEP
*STATIC
*BOUNDARY
 1,  1, 2, 0.0
 13, 2, 2 ,0.0
*CLOAD
 9999, 2, -1000.0
*NODE FILE, FREQ=1000
 U,
 RF,
*NODE PRINT, FREQ=1000, TOTALS=YES
 U,
 RF,
*OUTPUT, FIELD, FREQ=1000
*NODE OUTPUT
 U,
 RF,
*END STEP