Hello!
I’ve three quetions about modal analysis in 3D.
1) In 3D I found that also simple symmetric structure have the first eigenvectors with component in all direction (One of these is dominant, the other much smaller). I expected that
only one component was different from 0. Why isn’t it so?
2) What kind of normalization has been used for eigenvectors?
3) I’m studying a simple Three-Dimensional Rigid Frame, similar to example 5 of “Open Sees Examples Primer”. To obtain more than 4 eigen values I assign to the other nodes (different from diaphragms master node) very small mass values like 1e-9. This way I obtain, for a 3-story building, 13 eigen values. I’d like to obtain 9 eigen values (three for each floor). Do you know how can I get this result?
And another question about Tcl language:
In this example:
set v111 10
set j 1
$v1$j1 dont’t work.
How can I refer to v111 using variable j?
Thank you for the attention.
Best regards.
Modal Analysis in 3D
Moderators: silvia, selimgunay, Moderators