The OpenSees Community

hi.
when i take envelope element recorder for a truss element in a pushover analysis,does the out-put values are corresponds to the latest step of the displacement incremented?

hi fmk.
sorry but when i change the elements to elastic the period does not change.what should i do???

i've modeled 6 story RC moment frame in 2d.for considering rigidity of diaphragm i've used equalDOF, equalDOF 2 9 1 equalDOF 2 16 1 (2,19,16 nodes in a one level) is that correct? but i studied a report by this article(Modeling Diaphragms in 2D Models with Linear and Nonlinear Elements,Vesna Terzic ...

thanks for your reply.
but when i take out put for push over analysis (base shear versus roof disp) the first number (607.314) is the force that corresponds with the first step of lateral displacement.???

i've modeled a 6 story RC moment frame (3D) in etabs but i used 2D frame in opensees.
the period that coputed from etabs is 1.18 but period thad computed from opensees is .72 ???why????
(for considering effect of rigid diaphragm in 2d model i used big moment of inertial for beams)

hi. i have a 2d RC moment frame with buckling restrained braces. i have used truss element for brbs. I would like to record the force in these elements(brbs) for this purposes: to monitor whether there is any yielding in the truss elements. i use this command but i dont recognize the axial force and...

thanks for your help

Hi
yes i use fiber section.for yeilding part of brb,truss element.and for the rest of brb,elastic beam column.

i have a 3d Rc moment frame in etabs(7 story &two bays). but i've modeled a 2d frame in opensees (and using buckling restrained braces in it). now i want to calculate the natural period before and after using BRBs. should i consider live loads on the compute of nodal mass? which combination of load ...

Hi
my model is a 6 story 2 bay Rc moment frame that i've used buckling restrained knee braces in it,but the pushover analysis dose not converge?
what should i do?
has anyone done this before?