Issue in convergence
Posted: Sat Feb 29, 2020 10:57 am
I am applying load on a beam-column joint assembly with the zero-length rotational springs at the interface and in centre of joint.
1. I have tried a lot but still, the model does not go forward beyond 1.5 seconds. I changed the time series from linear to now to constant for beam-tip load and axial load. While for the displacement applied at the top of the column I used time-series from 0, 0.08 to 3.2 along the y-axis.
2. Is this okay to use the displacement and load interchangeably as in the considered case the experimental test was displacement control while I clicked the option of load-control in Static analysis window?
3. Can you plz help me out. The end condition includes beam top and column bottom end are hinged and allow only Rz while the top of the column has also 2 dofs i.e. Ux and Uy. All zero-length rotational springs have only one DoF of Rz.
The received error is shown below:
CTestNormDispIncr::test() - iteration: 30 current Norm: 2678.64 (max: 1e-06, Norm deltaR: 5.54895e+10)
CTestNormDispIncr::test() - iteration: 31 current Norm: 26564.3 (max: 1e-06, Norm deltaR: 5.36857e+11)
WARNING - ForceBeamColumn2d::update - failed to get compatible element forces & deformations for element: 2(dW: << 179.039)
Domain::update - domain failed in update
LoadControl::update - model failed to update for new dU
WARNING AcceleratedNewton::solveCurrentStep() -the Integrator failed in update()
StaticAnalysis::analyze() - the Algorithm failed at iteration: 150 with domain at load factor 1.51
OpenSees > analyze failed, returned: -3 error flag
Press any key to continue . . .
4. Can we perform the displacement control method, by applying gradually increasing displacement on the top of the column? What will be the procedure if we do so by choosing the displacement control method ((rather than a load-control option)) in the static analysis?
1. I have tried a lot but still, the model does not go forward beyond 1.5 seconds. I changed the time series from linear to now to constant for beam-tip load and axial load. While for the displacement applied at the top of the column I used time-series from 0, 0.08 to 3.2 along the y-axis.
2. Is this okay to use the displacement and load interchangeably as in the considered case the experimental test was displacement control while I clicked the option of load-control in Static analysis window?
3. Can you plz help me out. The end condition includes beam top and column bottom end are hinged and allow only Rz while the top of the column has also 2 dofs i.e. Ux and Uy. All zero-length rotational springs have only one DoF of Rz.
The received error is shown below:
CTestNormDispIncr::test() - iteration: 30 current Norm: 2678.64 (max: 1e-06, Norm deltaR: 5.54895e+10)
CTestNormDispIncr::test() - iteration: 31 current Norm: 26564.3 (max: 1e-06, Norm deltaR: 5.36857e+11)
WARNING - ForceBeamColumn2d::update - failed to get compatible element forces & deformations for element: 2(dW: << 179.039)
Domain::update - domain failed in update
LoadControl::update - model failed to update for new dU
WARNING AcceleratedNewton::solveCurrentStep() -the Integrator failed in update()
StaticAnalysis::analyze() - the Algorithm failed at iteration: 150 with domain at load factor 1.51
OpenSees > analyze failed, returned: -3 error flag
Press any key to continue . . .
4. Can we perform the displacement control method, by applying gradually increasing displacement on the top of the column? What will be the procedure if we do so by choosing the displacement control method ((rather than a load-control option)) in the static analysis?