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how can I assign 2 section to the one element
and how can we modeling the stress that remaining from gravity load in the old concrete

that s it. But how can I model the slipe of new concrete and old concrete

I want to creat a concrete section model and strenght that whit concrete jacketing
How can I model the slipe of beatvin the new concrete and old concrete
and how can I model the stress of gravity load in old concrete

in opensees navigator
I want to model shear wall in concrete structure
but I can t difine the recorder of wall?
what do I do?

what dose this error mean: WARNING SuperLU::solve(void)- Error 79 returned in factorization dgstrf() WARNING NewtonRaphson::solveCurrentStep() -the LinearSysOfEqn failed in solve() StaticAnalysis::analyze() - the Algorithm failed at iteration: 0 with domain at load factor 0.1 OpenSees > analyze fail...

why this error clear?
warning forceBeamColumn3d::update failed to get compatible element force & deformation for element:8,<dw<< .00079876 , dw0:3.8634>

I changed the strains and this massage clear
"displacementcontorol ::newStep -model failed to update for new du"

how can i calculate the stiffness of the structure model

what this dose this error mean?

"warning- force beam column3d ::update faild to get compatible
element forc & deformations for element
analyze failed returned :-2 error flag"

how can i check constrain?

this message clear
warning band gen lin lapack solver::solve() -lapack routine returned 1
warning newton raphson::solve currentstep() the linear sys ofeqn failed in solve()

analyze failed,returned:-3 error flag

what is this error mean
"-3 error flag"

what dose this message mean?
bandgenlapa solver::solve()-lapack routine returned1

newtonraphson::solvecurrent step()-the linear sysofegn failed in solve()
- static analisys::analyze()- the algorithm failed at iteration 0

this message clear
"missing close brace"

this is a part of my model my model is 25*30 and height 15m when I run that this message clear : element torsional stiffness GJ/L=1e+01forceBeamcolumn3d::forceBeamcolumn3d forceBeamcolumn3d--no torsion detected in section,continuing with element torsional stiffness GJ/L=..... and this message repeat...