displacement adaptive pushover method

[sheng0122]

hi all,
I want realize displacement adaptive pushover method with OpenSees, but i got the mode analysis question. Using sp commant to give the structure displacement, but after the step, the eigen commant cannot execute. because of the DOF of displacement were constraint. I wandered that if Opensees can delete the constraint, and keep the situation of the structure as well as.
Thank u !

[archeura]

Hi,
please contact me using this forum!
I don't have lastest version of OpenSees,but in my version (1.7.3) I used the command:

'remove loadPattern $number of pattern$'

So you can do an eigenvalue problem at every single step of analysis.

Another way is to use 'save' and 'restore' commands, but in my version these didn't work very well!!

Hi

Pollio Bernardino

(Hi Silvia!!! I'm still here!!!...well...sometimes!)

[foadEng]

Hi
I am trying to do an adaptive pushover analysis but I have some problems during the procedure! So I was wondering if someone could help me by sending some opensees scripts. This would be really helpful and I will be grateful.
Thanks

[mkk_ce]

Hi
You should remove your loadPattern at each step, like :

for {set j1 1} {$j1<=$nStep} {incr j1 +1} {
remove loadPattern 1;
eigen $nMode;
pattern Plain 1 Constant {
sp ...;
};

set ok [analyze 1];
};

This script can get eigen values at each step but actually I don't know is it correct or not.