eigenvector

[nhytb]

Hi Silvia.
Dear Silvia, is there any way to find eigenvector, modal participation factor, and modal mas matrix by Opensees?

[fmk]

you can get te eigenvector using a node recorder or node response command. .. the others need to be calculated

[nhytb]

fmk wrote:
> you can get te eigenvector using a node recorder or node response command.
> .. the others need to be calculated

thanks for your help, but do you have a sample code for node recorder or node response command? I'm very new in opensees and i don't know much about this command. thank you:)

[fmk]

model Basic -ndm 2
node 1 0 0
node 2 1. 0. -mass 1. 1.1 0.0
fix 1 1 1 1
geomTransf Linear 1
element elasticBeamColumn 1 1 2 10 10 10 1
analysis Transient
puts [eigen 1]
print node 2
recorder Node -file eig.out -node 2 -dof 1 2 "eigen 1"