how to record response after specified time

[parisaKM]

Hi,

I want to record drift values after a specified time step. Is there any way to do in opensees?

tnx
parisa

[selimgunay]

You can add the recorder after a certain time step. Below is an example

set tTot [time {
for {set i 1} {$i < $Nsteps} {incr i} {
set t [time {analyze 1 [expr $DtAnalysis]}]

if {$i== 100 } {
recorder Node -file disp.out -time -node 100 -dof 1 2 3 disp
}

puts $outFileID $t
#puts "step $i"
}
}]

[parisaKM]

Thanks a lot for your quick answer.
It reduced the analysis speed, is it normal?

[selimgunay]

Yes that is normal as writing to the recorder files also take time. If you used that you can remove "puts $outFileID $t"

[parisaKM]

i have to run 1000000 analysis!! Is there any other way not effect the analysis speed?

[parisaKM]

It caused some errors?! i removed it. Following is the revised version:)

set tTot [time {
for {set i 1} {$i < $Nsteps} {incr i} {
set t [time {analyze 1000 [expr $DtAnalysis]}]

if {$i== 100 } {
recorder Drift -file $dataDir/Drift-Story1-time.txt -time -iNode 11 -jNode 12 -dof 1 -perpDirn 2
}

}
}]

[selimgunay]

You are only recording a single time series, so it should not affect it dramatically. Things that you can do to speed up the analysis is

1. Use OpenSeesMP for the 1000000 analyses.
2. Use RCM for Numberer.
3. If possible, use Explicit integration (Explicit Newmark or Central Difference)

[parisaKM]

Thank you.
I will work on it.