Learning Forum

[asder]

NEED TO MAKE SUPERPOSITION TIME HISTORY SEISMIC ANALYSIS
I MADE SOME CODES NONE OI IT WORKS :-

[Rob]

You need to model the effect on the fluid in the tank? Or are you looking at the effect on the concrete bit?

[asder]

dear sir, 

i modeled the tank and i gain all modes of shape from modal analysis 

my problem is time history superposition analysis 

i found some codes for an example like 

IF,transient,EQ,1,THEN
/SOLU
ANTYPE,TRANS
TRNOPT,MSUP,10,DAMP
TIMINT, ON, STRUCT
*DIM,force,table,5001,1,1,TIME,,
*TREAD,force,input4,txt,,
DELTIM,1E-4,1E-6,1E-4,ON
AUTOTS, OFF
OUTRES,,1
!TM_START=1E-4
TM_START=0.0
TM_END=0.5
TM_INCR=1E-4
i=0
*DO,TM,TM_START,TM_END,TM_INCR
i=i+1
OUTRES,,1
NSUBST,1
TIME,TM
value=force(TM)
*STATUS,VALUE,1,,1,,1,,
F,N_F,FZ,value,,,
SOLVE
*ENDDO
FINISH
does it right ? if i use acel,timehistorytable,0,9.8 does this load function is right ? i use it for superposition but i found the results is modes shapes only and frequency changed to time , this isn't right solution , why i get that solution 

[asder]

IF,transient,EQ,1,THEN

/CONFIG,NRES,1000000000

/SOLU

ANTYPE,TRANS

TRNOPT,full

*DIM,ACC,TABLE,12002,1,1,TIME

*TREAD,ACC,seismic-recorded,TXT

OUTRES,ALL,ALL

DMPRAT,0.005

!TM_START=0.005

TM_START=0.005

TM_END=60

TM_INCR=0.005

i=0

*DO,TM,TM_START,TM_END,TM_INCR

TIME,TM

ACEL,%ACC%,0,9.8

SOLVE

*ENDDO

FINISH

 

or this 

[jj77]

Stop copy pasting code without any explanations first thing.

 

You said: my problem is time history superposition analysis, try running it with the full method (not mode super position).

 

If you are still having troubles, explain in detail what the problem is, and attach images to show what you mean in your explanation so we can understand.

 

 

[asder]

i will next few days, thank you friend , do you work in 3D-BASIS-ME-MB software ?