Dear FreakoValiko,
Thank you for your reply and your recommendations , unfortunatly i have been through all your recommendation but the problem remains. i am not able to figure out where the issue could be since all the necessary cases to run the model are working Grav-Modal-Pushover and even for THA analysis for linear analysis it is running as well as up to a certain level of nonlinearity .
Search found 2 matches
- Fri Jan 05, 2024 2:02 am
- Forum: OpenSees.exe Users
- Topic: Undefined Source of Non-Convergence OpenSees
- Replies: 2
- Views: 3885
- Thu Jan 04, 2024 10:48 am
- Forum: OpenSees.exe Users
- Topic: Undefined Source of Non-Convergence OpenSees
- Replies: 2
- Views: 3885
Undefined Source of Non-Convergence OpenSees
Dear All, I wish you a happy new year.
I have a nonlinear simple model in OpenSees , where the nonlinearity is model by zerolength element at the 4 support point of the model. ( I attached a picture to visualize the model) .
To ensure that the model is running correctly I did run Gravity – Modal -Pushover analysis , and all these three different cases are running correctly . So I want to increase the intensity of the GM , I started with very low intensity 0.2g up to 0.689 g is running fine ( note that 0.689 Is the start of the nonlinearity in the model) . start from here I start getting convergence issues.
So for the solution, I've tried various solutions like changing convergence tests, algorithms, and material parameters, but the issue persists.
I've attached images showing zerolength element deformations in cases with and without convergence problems.
Is this problem with OpenSees itself or do I have some issue in the modelling?
Your help is much appreciated !
The Error :
NormDispIncr KrylovNewton 0
WARNING: CTestNormUnbalance::test() - failed to converge
after: 25 iterations current Norm: 909944 (max: 1e-06, Norm deltaX: 22.8693)
NewtonRaphson::solveCurrentStep() -the ConvergenceTest object failed in test()
DirectIntegrationAnalysis::analyze() - the Algorithm failed at time 15.56
OpenSees > analyze failed, returned: -3 error flag
I have a nonlinear simple model in OpenSees , where the nonlinearity is model by zerolength element at the 4 support point of the model. ( I attached a picture to visualize the model) .
To ensure that the model is running correctly I did run Gravity – Modal -Pushover analysis , and all these three different cases are running correctly . So I want to increase the intensity of the GM , I started with very low intensity 0.2g up to 0.689 g is running fine ( note that 0.689 Is the start of the nonlinearity in the model) . start from here I start getting convergence issues.
So for the solution, I've tried various solutions like changing convergence tests, algorithms, and material parameters, but the issue persists.
I've attached images showing zerolength element deformations in cases with and without convergence problems.
Is this problem with OpenSees itself or do I have some issue in the modelling?
Your help is much appreciated !
The Error :
NormDispIncr KrylovNewton 0
WARNING: CTestNormUnbalance::test() - failed to converge
after: 25 iterations current Norm: 909944 (max: 1e-06, Norm deltaX: 22.8693)
NewtonRaphson::solveCurrentStep() -the ConvergenceTest object failed in test()
DirectIntegrationAnalysis::analyze() - the Algorithm failed at time 15.56
OpenSees > analyze failed, returned: -3 error flag