Participation Factors, Modal masses etc.

[divamva]

I believe it would be quite useful to have some way of getting out participation factors and modal masses. I have been thinking about trying some Modal Pushover Analysis and maybe some elastic response analysis and while these quantities are only a couple of matrix multiplications inside OpenSees they are very difficult to do using its output.

[silvia]

while I have to go back and review this topic, this is a very good suggestion!
what kind of data do you need to do this calculation? Is this something you can do in Tcl? the eigen command does give you eigenvalues, and I believe there is a way to get eigenvectors.

[divamva]

I am pretty sure that you only need the eigenvectors and the mass matrix

You can assemble the eigenvectors if you print out the model and I guess in the same way you could assemble the mass matrix and then do the necessary multiplications in Tcl. Still, it would be so much easier if it was done within Opensees where the mass matrix and the eigenvectors are already available.

[janet986w]

[quote="divamva"]I believe it would be quite useful to have some way of getting out participation factors and modal masses. I have been thinking about trying some Modal Pushover Analysis and maybe some elastic response analysis and while these quantities are only a couple of matrix multiplications inside OpenSees they are very difficult to do using its output.[/quote]

I also think so.


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