eigenvector

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here. Hopefully we will be able to get the most useful of these incorporated in the manuals.

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nhytb
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Joined: Fri Mar 13, 2015 2:48 pm
Location: IKIU

eigenvector

Post by nhytb » Mon Sep 14, 2015 4:37 pm

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

fmk
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Re: eigenvector

Post by fmk » Thu Sep 17, 2015 7:28 am

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

nhytb
Posts: 9
Joined: Fri Mar 13, 2015 2:48 pm
Location: IKIU

Re: eigenvector

Post by nhytb » Fri Sep 18, 2015 2:21 pm

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
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Re: eigenvector

Post by fmk » Tue Sep 22, 2015 4:33 pm

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"

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