frame wall connection

[vahidbarzegar]

Hi,
I'm trying to connect an RC frame(modeled with nonlinear springs and elastic beam column) to the centerline of a shear wall (modeled with force based elements).
Frame and shear wall performs well separately but when I connect the adjacent beams to the shear wall with a stiff beam column element (I=10m^4) gravity analysis cannot be performed.
the stiff connection beam rigidly connects the end of the adjacent beam to the centerline of the wall at each floor.
P.S.: there are two spans of moment frames on either side of the wall.

[fmk]

if work independently, but fail when you add a 'stiff' beam, the problem is either an incorrect beam definition ( i am assuming this is not the problem but just throwing this out) or numerical, possibly a conditioinging problem of matrix or the choice of convergence test .. does it fail to converge or does the solver fail ?

[vahidbarzegar]

convergence test is NormDispIncr 10.e-6 10 0
this is the warning:
WARNING - ForceBeamColumn2d::update - failed to get compatible element forces &
deformations for element: 60803(dW: << 27637.1)
Domain::update - domain failed in update
LoadControl::update - model failed to update for new dU
WARNING NewtonRaphson::solveCurrentStep() -the Integrator failed in update()
StaticAnalysis::analyze() - the Algorithm failed at iteration: 0 with domain at
load factor 0.05
OpenSees > analyze failed, returned: -3 error flag

[fmk]

and what is element 60803? frame, wall or connector?

[vahidbarzegar]

wall element at 8th floor

[fmk]

what is the purpose of the stiff beam and not an equalDOF? anyway make the wall elastic and have a look at the forces the connecting beam is imposing on the wall from the frame.

[vahidbarzegar]

equalDOF?
The adjacent beam and centerline of the wall are 4 meters apart. Does equalDOF work?
The purpose of the stiff beam is 1) to consider the length of the wall and 2) to impose rotations of the wall to adjacent beams.
equalDOF, in this case, imposes the rotations of the centerline of wall to the beams.

[selimgunay]

Have you tried using a rigid end offset to consider the length of the wall? Below is a syntax to do this for Linear Transformation

geomTransf Linear $transfTag $vecxzX $vecxzY $vecxzZ <-jntOffset $dXi $dYi $dZi $dXj $dYj $dZj>

[vahidbarzegar]

thanks. I'm gonna try it

[aminulislam]

@vahidbarzegar
Did you solve your problem. I am facing the same kind of problem. Could you please help me?

[ahmadbsr]

equalDOF?
The adjacent beam and centerline of the wall are 4 meters apart. Does equalDOF work?
The purpose of the stiff beam is 1) to consider the length of the wall and 2) to impose rotations of the wall to adjacent beams.
equalDOF, in this case, imposes the rotations of the centerline of wall to the beams.

Did you fix your problem? I want ask you something