Search found 4 matches

by amatamor
Wed May 04, 2016 7:48 pm
Forum: OpenSees.exe Users
Topic: BFGS Algorithm with VariableTransit Analysis
Replies: 5
Views: 4334

Re: BFGS Algorithm with VariableTransit Analysis

I did specify the-time option. My concern is that even though a warning is shown, when using the BFGS algorithm it seems that execution continues without any reduction in step size. Output from KrylovNewton algorithm when OS prints a warning indicating that the number of iterations has been exceeded...
by amatamor
Mon May 02, 2016 9:05 am
Forum: OpenSees.exe Users
Topic: BFGS Algorithm with VariableTransit Analysis
Replies: 5
Views: 4334

Re: BFGS Algorithm with VariableTransit Analysis

The model runs fine, both for Gravity and earthquake loading. With a variable transient analysis I think that the algorithm cuts back after not reaching convergence and tries again until it converges. No problem there. The problem is that the recorder stores the results at a fixed time increment, an...
by amatamor
Fri Apr 29, 2016 1:32 pm
Forum: OpenSees.exe Users
Topic: BFGS Algorithm with VariableTransit Analysis
Replies: 5
Views: 4334

BFGS Algorithm with VariableTransit Analysis

I am analyzing a frame using the BFGS algorithm and variable transit analysis. Regardless of the increment size I specify or the maximum number of iterations opensees always reports failure to converge after 10 iterations, and always reports the results in 0.01 second increments. This behavior diffe...
by amatamor
Thu Jul 09, 2015 11:19 am
Forum: OpenSees.exe Users
Topic: Problem with ModIMKPeakOriented and ModIMKPinching materials
Replies: 10
Views: 11725

Re: Problem with ModIMKPeakOriented and ModIMKPinching mater

Same problem here. Works fine for gravity and pushover analyses, but not for dynamic analyses. Moment in the zero-length element does not match the elastic beam column element, and the deformations are much larger in the elastic member than in the zero-length springs. The difference in moments chang...