jasmine-90
Structural
- Jun 7, 2017
- 3
i am applying a load of 50KN gradually on a reinforced concrete beam,
i'm unloading this load using an amplitude to get the loading and unloading versus deflection graph.
i have used concrete damaged plasticity to model concrete.
the problem is with the run , it has reached the maximum load but after few increments in the unloading stage i have got this message "too many attempts made for this increment"
noting the problem was in the loading stage first , but i played a little with the solution controls, so it delayed this message to the unloading stage.
what i have done is as the following:
changed the solution technique from full newton to quasi newton
used discontinuous analysis in the time increment
in search algorithm , i have changed N from default of 5 to 10 and etha(accuracy) from 0.1 to 0.01
in the attached figure, the analysis stops at 0.56029 sec which is in the unloading stage.
what to do?! i need help please
i'm unloading this load using an amplitude to get the loading and unloading versus deflection graph.
i have used concrete damaged plasticity to model concrete.
the problem is with the run , it has reached the maximum load but after few increments in the unloading stage i have got this message "too many attempts made for this increment"
noting the problem was in the loading stage first , but i played a little with the solution controls, so it delayed this message to the unloading stage.
what i have done is as the following:
changed the solution technique from full newton to quasi newton
used discontinuous analysis in the time increment
in search algorithm , i have changed N from default of 5 to 10 and etha(accuracy) from 0.1 to 0.01
in the attached figure, the analysis stops at 0.56029 sec which is in the unloading stage.
what to do?! i need help please