drift response

[jackmil]

dear all
how can i control drift by using the eleResponse Command?! its unclear for me.
how can i use the command for this drift recorder :


recorder Drift -file "$dataDir/$subDir1/Drift.out" -iNode 141 -jNode 111 -dof 1 -perpDirn 2;

set DriftStep [eleResponse ? ? ? ? ? ]

[vesna]

what exactly do you want to do?

[jackmil]

i wanna get the drift in each step of cyclic or dynamic analysis and check it in a loop,but i dont know how ,i mean i don know how to write the eleResponse command;

[eleResponse ................?................]

recorder Drift -file "$dataDir/Drift.out" -iNode 141 -jNode 111 -dof 1 -perpDirn 2;
if i wanna get the stressStrain of outer fiber of for example hss-fiber section, i dont know how i fill the blank following example below:

eval recorder Element -file "$dataDir/StressStrain.out" -ele 14006 15006 section 3 fiber ...?... stressStrain;
i cant understand the modeling SCBF opensees discovering,

[vesna]

you can use nodeDisp command (http://opensees.berkeley.edu/wiki/index ... sp_Command) to calculate the drift.

to retrieve stress of a particular fiber during the analysis here is an example:

set stressFiber1 [eleResponse $matTag section 3 fiber $fiberNumber stress]

following $matTag arguments are the same as the ones you would use within recorder

[jackmil]

thank u very much !!
really appreciate ur concern dear vesna !

[jackmil]

dear vesna
hello
thank u for ur attention;
can i use the remove command like this for ElementS?

set eleList "10006 11006 12006 13006"
evel remove element $eleList ?

[jackmil]

for removing a brace that built ten segments,do i have to remove all of the segments to cansel of barce action? or there is another way to do this easier? wasnt there any problem for example deleting elements for convergence problem?

[vesna]

I think that with the "remove element" command you can remove only one element. to remove all segments of the brace you will have to issue several remove element commands. if you do it within a loop it may not be that difficult.

[jackmil]

ofcourse... omm but should i remove the rotational springs in the first and end of the brace too in addition to removing the segments and dangling nodes of the brace?? how about the ghost trusses to the braces ( to diminish convergence problems )

[vesna]

I would remove all of it.

[jackmil]

dear frank
dear vesna
i really need your help . . .
i would remove all the bracing segments and their dunglin nodes, but during the analysis, when model reached its limitation by using eleResponse limit state and removed their element and related nodes , it faced with some errors. i think that i should apply some other commands that i dont know them.
does the Opensees understand when the bracing segments removed,stiffnes matrix of model must be changed or updated?
do i remove the recorder with respect to the bracing segments too?

[fmk]

OpenSees takes care of the stifness; yes remove the recorders.