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constant load

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pushkaraj123

Civil/Environmental
Jul 12, 2007
2
My analysis involves 2 steps....In the first step I increase a concentrated load upto a certain value at the end of the step.And in the second step I need to keep that load constant while increasing other loads throughout the step..How do I do that?Relevant part of input file is given below...Is it correct,if not please help.

**% ====== STEP NUMBER 1 ======
**%
*STEP,NLGEOM,INC=100
*STATIC,DIRECT
.01,1
**% BOUNDARY CONDITION SET 1
**% RESTRAINT SET 1
*BOUNDARY,OP=NEW
BS000001, 1, 2, 0.00000E+00
**% LOAD SET 1
*CLOAD,OP=NEW
5448, 1, 1.0000E+07
*NSET, NSET=BS000001, GENERATE
5428, 5429, 1
5433, 5435, 1
5439, 5441, 1
5456, 5459, 1
5498, 5535, 1
5568, 5579, 1
5588, 5591, 1
*NODE FILE,FREQUENCY=1,GLOBAL=YES
U,
*OUTPUT, FIELD, FREQUENCY=1
*NODE OUTPUT, NSET=ALLNODES
U,
*EL FILE, FREQUENCY=1, DIRECTIONS=YES
NFORC,
*OUTPUT, FIELD, FREQUENCY=1
*ELEMENT OUTPUT, ELSET=ALLELEMENTS
NFORC,
*END STEP
**%
**% ====== STEP NUMBER 2 ======
**%
*STEP,AMPLITUDE=RAMP,NLGEOM,INC=400
*STATIC,STABILIZE
.01,1,1e-8,.01
*SOLUTION TECHNIQUE,TYPE=QUASI-NEWTON
*CONTROLS,ANALYSIS=DISCONTINUOUS
*CONTROLS,PARAMETERS=LINE SEARCH
10,,,,.01
**% BOUNDARY CONDITION SET 1
**% RESTRAINT SET 1
*BOUNDARY,OP=NEW
BS000001, 1, 2, 0.00000E+00
5618, 2,, 0.20000E+00
**% LOAD SET 1
*CLOAD,OP=MOD
5448, 1, 1.0000E+07
*NODE FILE,FREQUENCY=1,GLOBAL=YES
U,RF
*OUTPUT, FIELD, FREQUENCY=1
*NODE OUTPUT, NSET=ALLNODES
U,RF
*END STEP
 
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