ConvergenceTest object failed in test

[duttaANURAG]

Good Afternoon Everyone,

I was working on another problem of Concrete Gravity Wall-Backfill- Foundation Soil Interaction Problem today and the analysis failed. It showed an error message like -

WARNING: CTestNormDispIncr::test() - failed to converge
after: 100 iterations current Norm: 14.4652 (max: 1e-005, Norm deltaR: 36.9082)
AcceleratedNewton::solveCurrentStep() -The ConvergenceTest object failed in test()
StaticAnalysis::analyze() - the Algorithm failed at iteration: 0 with domain at load factor 1
OpenSees > analyze failed, returned: -3 error flag

My Analysis and Output commands are as follows -

#------------------------------------------

#Create Gravity Analysis

#------------------------------------------

constraints Transformation

numberer RCM

system SparseGeneral

test NormDispIncr 1e-05 100 2

algorithm Newton

integrator LoadControl 1

analysis Static

updateMaterialStage -material 1 -stage 0; # Linear Elastic Behaviour

updateMaterialStage -material 3 -stage 0; # Linear Elastic Behaviour

updateMaterialStage -material 5 -stage 0; # Linear Elastic Behaviour

updateMaterialStage -material 7 -stage 0; # Linear Elastic Behaviour

updateMaterialStage -material 9 -stage 0; # Linear Elastic Behaviour

#Turn on Initial State Analysis

InitialStateAnalysis on

# set contact elements to be frictionless for gravity analysis

setParameter -value 0 -eleRange 10001 10010 friction

recorder Node -file GravityAnalysisElastic/NodeDispElastic.out -time -node 1 21 21 19 18 17 16 15 2 -dof 1 2 disp #Node Displacement in Left Side of Backfill

recorder Element -file GravityAnalysisElastic/quadInterFaceEleStressElastic.out -ele 943 863 783 703 623 543 463 383 stress #Stress in Soil Element Grids facing the wall

recorder Element -file GravityAnalysisElastic/quadInterFaceEleStrainElastic.out -ele 943 863 783 703 623 543 463 383 strain #Strain in Soil Element Grids facing the wall

recorder Node -file GravityAnalysisElastic/LeftNodeReactionElastic.out -time -node 14 373 374 375 376 377 378 379 13 -dof 1 2 reaction #Left Node Reaction

recorder Element -file GravityAnalysisElastic/slaveForceElastic.out -time -eleRange 10001 10010 forces

recorder Element -file GravityAnalysisElastic/frictForceElastic.out -time -eleRange 10001 10010 frictionforces

recorder Element -file GravityAnalysisElastic/contForceElastic.out -time -eleRange 10001 10010 forcescalars

recorder Element -file GravityAnalysisElastic/mastForceElastic.out -time -eleRange 10001 10010 masterforces

recorder Element -file GravityAnalysisElastic/globalForcesElastic.out -time -eleRange 4375 4382 globalForce #Record Beam Response

analyze 5

puts "Elastic Analysis done."

puts "MaterialBehavior Changed to Plastic"

updateMaterialStage -material 1 -stage 1; # Plastic Behaviour

updateMaterialStage -material 3 -stage 1; # Plastic Behaviour

updateMaterialStage -material 5 -stage 1; # Plastic Behaviour

updateMaterialStage -material 7 -stage 1; # Plastic Behaviour

updateMaterialStage -material 9 -stage 1; # Plastic Behaviour

#Turn off Initial State Analysis

InitialStateAnalysis off

constraints Transformation

numberer RCM

system SparseGeneral

test NormDispIncr 1e-05 100 2

algorithm KrylovNewton

integrator LoadControl 1

analysis Static

logFile Error.txt

# turn on frictional behavior for beam contact elements

setParameter -value 1 -eleRange 10001 10010 friction

recorder Node -file GravityAnalysisPlastic/NodeDispPlastic.out -time -node 1 21 21 19 18 17 16 15 2 -dof 1 2 disp #Node Displacement in Left Side of Backfill

recorder Element -file GravityAnalysisPlastic/quadInterFaceEleStressPlastic.out -ele 943 863 783 703 623 543 463 383 stress #Stress in Soil Element Grids facing the wall

recorder Element -file GravityAnalysisPlastic/quadInterFaceEleStrainPlastic.out -ele 943 863 783 703 623 543 463 383 strain #Strain in Soil Element Grids facing the wall

recorder Node -file GravityAnalysisPlastic/LeftNodeReactionPlastic.out -time -node 14 373 374 375 376 377 378 379 13 -dof 1 2 reaction # Left Node Reaction

recorder Element -file GravityAnalysisPlastic/slaveForcePlastic.out -time -eleRange 10001 10010 forces

recorder Element -file GravityAnalysisPlastic/frictForcePlastic.out -time -eleRange 10001 10010 frictionforces

recorder Element -file GravityAnalysisPlastic/contForcePlastic.out -time -eleRange 10001 10010 forcescalars

recorder Element -file GravityAnalysisPlastic/mastForcePlastic.out -time -eleRange 10001 10010 masterforces

recorder Element -file GravityAnalysisPlastic/globalForcesPlastic.out -time -eleRange 4375 4382 globalForce #Record Beam Response

analyze 5

wipe

Please help me as I am not being able to understand what is the error actually?

Your kind help will be appreciated a lot.

Thank You.

[fmk]

the message says that after 100 iterations it failed to reach the convergence that you specify of 1.0e-5 on the norm of the disp increment, at the 100'th step the norm was 14.4 and the norm of the unbalance was 36.9.

as it is failing in the very first analysis step .. your model is probably incorrect.

[duttaANURAG]

Thank You Sir. I got it now. There is some problem with my model.

[wengmini]

Hi,

I have the same problem with my model. It will not converge, I was wondering what was the problem with your model, maybe I can have a look at mine as well.

Thanks,

[ahmadbsr]

Hi,

I have the same problem with my model. It will not converge, I was wondering what was the problem with your model, maybe I can have a look at mine as well.

Thanks,

I have same problem did you fix your problem ?