modal participation factor in opensees for 3D truss bridge

[myasanwai]

Dear all,

How can get the modal participation factor of 3D truss bridge for -ndm 3 -ndf 6 in Opensees? It can be available directly form Opensees for -ndm 3 -ndf 6 for 3D truss bridge?
I used the eigenvalue analysis as follows and can I get modal participation factors from the follow eigen command?

Somebody can help me, please?

Thanks.


#------------------------------------------------------------------------------------------------------------------
#Eigenvalue analysis

set numModes 10
set lambda [eigen $numModes];

# calculate frequencies and periods of the structure ---------------------------------------------------
set omega {}
set f {}
set T {}
set pi 3.141593

foreach lam $lambda {
lappend omega [expr sqrt($lam)]
lappend f [expr sqrt($lam)/(2*$pi)]
lappend T [expr (2*$pi)/sqrt($lam)]
}

#
puts "periods are $T"

puts "ferquencies are $f"
# --------------------------------------------------------------------------------------------------------------------------------

[selimgunay]

You need to do the processing yourself to compute the modal participation factors. You need to use the recorder for the mode shapes and printA for the mass matrix.

[myasanwai]

Thanks selimgunay for your response. I would try.

Regards,
mya san wai