convergence problem Nonlinear frame

[sgs]

Hi all;
I am doing a transient analysis on a nonlinear frame,
I keep getting this warning:

WARNING: CTestEnergyIncr::test() - failed to converge
after: 10 iterations
ModifiedNewton::solveCurrentStep() -the ConvergenceTest object failed in test()
DirectIntegrationAnalysis::analyze() - the Algorithm failed at time 0.21
OpenSees > analyze failed, returned: -3 error flag

My analysis object is :

algorithm ModifiedNewton
integrator Newmark 0.5 0.25
test EnergyIncr 1.0e-8 10 0
numberer Plain
constraints Plain
system BandGeneral
analysis Transient

could anyone help me,plz?
Thanks

[vesna]

Try to do the analysis in a while loop as is was done in this example:
http://opensees.berkeley.edu/wiki/index ... e_Analysis