modifying the model between two analyses

[andreamordini]

I need to modify one element between two static steps.
Since EMODIF can be used only with a PREP7 I have to solve the first step, enter prep and modify the element, reenter again SOLU. In this way the results of the first solu are cancelled.
1- How can I impose the time running from 0 to 1 for the first solu and from 1 to 2 for the second solu?
2- I use SSTIF to maintain the structural information between the two solve, but how can I retrieve the results for the first solu?

andrea


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Andrea Mordini, Civil Engineer, Ph.D.

http://www.andreamordini.com

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[cbrn]

Hi,
after the first run with ANTYPE,STATIC you can FINIsh and enter /PREP7, then re-enter /SOLU but, instead of doing a SOLVE, first set ANTYPE,RESTART. Then set TIME,2 etc. This will "append" your new calculation to the rst file as a new loadstep.
Regards

 

[andreamordini]

Actually it is a bit more complicated because in this way the analysis is restarted from the rbd file which is saved at the beginning of the first solve step: this means that the modification of the model is not taken into account.
In any case, I solve the problem as reported below.
Thanks, cbrn, you showed me the right direction!

andrea

/SOLU
ANTYPE, STATIC
RESCONTROL, , NONE ! the rdb file is not written
EMATWRITE, YES ! the emat file is written
TIME, 1
SSTIF, ON
OUTRES, ALL, ALL

...

ALLSEL
SOLVE
SAVE$FINISH

! ---------------------------------
/PREP7

... element modification

ALLSEL$SAVE$FINISH
! ---------------------------------

/SOLU
ANTYPE, STATIC, REST
TIME, 2
SSTIF, ON
OUTRES, ALL, ALL

...

ALLSEL
SOLVE
SAVE$FINISH



-------------------------------------------
Andrea Mordini, Civil Engineer, Ph.D.

http://www.andreamordini.com

-------------------------------------------