The OpenSees Community

i want OpenSees to give me the Mass Matrix of the structure in Global Coordinate System.
can anyone help me ?
regards

and what about Mass Matrix ?

Dear Frank
i want to get output of global stiffness matrix of a structure at the end of the severe earthquake in order to know how reduction has been occurred in the stiffness and strength.
how can i reach to this ?

Dear Users
i want OpenSees to give me the Stiffness Matrix of the structure in Global Coordinate System.
can anyone help me ?
regards

exactly !
there is problem here. you can utilize this interaction by self simulating based on limit state curves that are available in LRB factory catalog

Dear Jenniferun and alfo
i suggest TwoNodeLink Element and assigning Kikuchi Material.
i works Correctly. "especially in 2D Space"

it seems that it doesn't consider and doesn't apply geometric non-linearity in analysis and in 2D-Space while in the Opensees wiki command it has written that it is available to apply. Does "<-pDelta (4 $Mratio)>" is to consider Geo Non-linearity ? how about Co-rotational Geo Non-linearity ?

Here is The Code : wipe file mkdir KIKUCHIparallel model BasicBuilder -ndm 2 -ndf 3 node 1 0. 0. node 2 0. 0.336723805 node 3 0.05 0. node 4 0.05 0.336723805 node 5 -0.05 0. node 6 -0.05 0.336723805 fix 1 1 1 1 fix 3 1 1 1 fix 5 1 1 1 geomTransf Linear 1 uniaxialMaterial KikuchiAikenLRB 1 1 [expr 1....

in Opensees Wiki Definition , it has been specified that "DOF = 6" related to rotation about Local Z axis. when i assign the specific Material For this rotational Direction in 2D Space it gives me error !! why ? !! for example : " # ndm 2 and dof 3 uniaxialMaterial KikuchiAikenLRB 1 1...

Dear User
did you solve your problem ?
did element work properly in 3D Space ?
i worked with that element and it Diverged in most cases while the 2D link element with shear Properties of KIKUCHI MATERIAL worked properly and made sense !

dear User
Did you Find any information to applying Modal Damping to the Structure

Dear Users
I'm searching about MODAL DAMPING Command in Opensees (or applying Modal Damping) in Opensees
Would you please help me ?

Dear Users
i'm looking for Joint 3D Element For Modeling Panel Zone in three Dimensional Model, as same as Joint 2D Model in OpenSeesWiki, but i couldn't find it. is this element defined and available in 3D and can any one help me ?

Dear maksins
did you work with ElastomericBearing element in 2D ?
or any other Base Isolation material such as KIKUCHI ?
did you compared the results such as Hysteresis Curves of OpenSees and Other Programs such as SAP2000 ?

Dear Frank McKenna did you work with Kikuchi Material for Base isolation ? i wanna Know how has been developed this Material ? because there is a question here and that is : did the developer considered Damping in these Materials (KikuchiAiken LRB or KikuchiAiken HDR) or we should applied it Separat...