The OpenSees Community

Hi to all,
I'm on an adaptive pushover and I would obtain the eigenvectors for each load step. I don't know why, but the eigenvectors that I obtain are the same, also if I'have had a variation of the stiffness
Anyone can help me?

for the analysis you must put something like

test EnergyIncr 1.0e-8 20 3
algorithm Newton
system SparseGeneral -piv
constraints Transformation
integrator Newmark 0.5 0.25
numberer RCM
analysis Transient

The values of the eigenvectors that I obtain are already normalized? And respect to what?
Can I do an eigen analysis during a complete pushover analysis?

thanks. An other 3 questions...
The values that I obtain are already normalized? And respect to what?
Can I do an eigen analysis during a complete pushover analysis?

HELLO to everybody!

How can I calculate the eigenvectors of a structure in OS?

thanks a lot!

stefania

for compenetration i intend that a part of the end section of an element enter into the first section of the contiguous element... think to 2 contiguous beams (with rectangular section) with a different inclination of the z axis...

may i associate a non linear material to a brick element?

i can't approximate arch with many but short length nonlinear beam column elements, because in the joint that connect 2 contiguous elements there is compenetration of the sections....

how can i model a masonry arch?
If i proceed like example 7.1 I can't use an uniaxial material, like I would.
But if I use a non linear beam column element I can't model a curve element ....