Learning Forum

[TAOUFIK]

Hello
I work on a prestressed modal of a stayed bridge in ansys mechanical, I use the command initiate to apply presstress (p=419e6 Pa) on all cables as shown in the code bellow, but I don’t understand why I don’t obtain the same stress in results, Could any one help please ?

p=419e6
INISTATE,SET,CSYS,-2
INISTATE,SET,DTYP,STRE
*DO,i,1,27,1
INISTATE,DEFINE,i,,,,p 

*ENDDO

[Stella Peloni]

Hello,

In order for the stress to be applied at the cables, you need to select all the cable elements in your model. So, prior to inistate command, you should have something like:

esel,s,ename,,280

Where 280 is the cable element name (Cable280). I am not sure what the *do loop does, but I assume it's for selecting the cables? If yes, please remove the do loop and have the inistate,define as it is. Since, the elements were selected, the prestress will be applied to the cable elements and that is all is needed. 

Regards,

Stella

[TAOUFIK]

Thank you very much for answering,

I've tried to apply your recommandation using link180, i got the results below

code used:

p=419e6              ! prestress value
esel,s,type,180    ! select link180 type
INISTATE,SET,CSYS,-2
INISTATE,SET,DTYP,STRE
INISTATE,DEFINE,,,,,-p

Please , could you explain why the stress in the cables are  not equal to the applied prestress  (419e6 Pa)?

my second question is why the do loop cannot be used for selecting the cables (EL_1 to EL_27)?

thank you very much for your reaction

[TAOUFIK]

Any help please ?

An other question, How could i apply this command in transient analysis ?

Thanks