question about modes and periods

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zhan
Posts: 11
Joined: Fri Nov 21, 2008 4:25 pm
Location: UCLA

question about modes and periods

Post by zhan »

Hello,

I am using the eigen value I got to compute the system period for my 2D steel moment frame.
- I wonder how the modal eigen values are obtained
- by adding more elements (refining mesh), for my 2D frame, why the beams are much more sensitive than columns to the system period?
- How (if possible) can I see my mass and stiffness matrix in OpenSees?

TY for your time and patience.
vesna
Posts: 3033
Joined: Tue May 23, 2006 11:23 am
Location: UC Berkeley

Post by vesna »

To solve eigenvalue problem there are different solvers available in OpenSees:
http://opensees.berkeley.edu/wiki/index ... en_Command

At the moment there is no recorder for the mass and stiffness matrix. Alternatively, you can spit it out from the source code.
zhan
Posts: 11
Joined: Fri Nov 21, 2008 4:25 pm
Location: UCLA

problem solved

Post by zhan »

Thank you for your reply.

My problem is solved.

Zhan
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