Good Afternoon,
I am working on WallBackfillFoundation Soil interaction.
Recently, I started working on on of my problem in OpenSees. However, the analysis failed and it showed an error message as follow 
WARNING SuperLU::solve(void) Error 4598 returned in factorization dgstrf()
WARNING AcceleratedNewton::solveCurrentStep() the LinearSysOfEqn failed in solve()
StaticAnalysis::analyze()  the Algorithm failed at iteration: 3 with domain at load factor 0.04
OpenSees > analyze failed, returned: 3 error flag
My analysis commands are as follows 
Before Initial State Analysis 
constraints Transformation
test NormDispIncr 1e5 15 1
algorithm Newton
numberer RCM
system SparseGeneral
integrator LoadControl 0.01
analysis Static
analyze 4
and after Initial State Analysis turned off, my analysis commands are as follows 
constraints Transformation
test NormDispIncr 1e4 60 1
algorithm KrylovNewton
numberer RCM
system SparseGeneral
integrator LoadControl 0.01
analysis Static
analyze 4
Please help me as I am not being able to understand what is the actual problem? Should I change my algorithm and proceed?
Your kind help will be appreciated a lot.
Thank You.
Algorithm Failed at Iteration
Moderators: silvia, selimgunay, Moderators

 Posts: 37
 Joined: Fri Mar 23, 2018 2:56 am
 Location: NERIST
Re: Algorithm Failed at Iteration
if the solver fails it means the tangent matrix is singular, i.e. a 0 encountered on diagonal during factorization, i.e. your model is unstable. .. as it does get through the first few steps you could try swicthcing to a ModifiedNewton with initial stiffness iterations

 Posts: 37
 Joined: Fri Mar 23, 2018 2:56 am
 Location: NERIST
Re: Algorithm Failed at Iteration
Thank You Sir