fbd_ite during processing

[vincenttt]

Hi there,

I was trying to model a interchange of bridge with bearing and fix connection. After clicked the processor, the software calculated for about 9mins and then it stopped with fbd_ite. I have searched the 'fbd_ite' , 'convergence problem' or 'link element' in the forum, but I can't find any valuable information about my problem. So I just hope that you can teach me about how can this occur and how i can solve. Thank you!!!

Time= 20.44000, dt= 0.00500 (Iter: 1 => Converg)
Time= 20.44500, dt= 0.00500 (Iter: 1 => Converg)
Time= 20.45000, dt= 0.00500 (Iter: 1 => Converg)
Time= 20.45500, dt= 0.00500 (Iter: 1 => Converg)
Time= 20.46000, dt= 0.00500 (Iter: 1 => Converg)
Time= 20.46500, dt= 0.00500 (Iter: 1 => Converg)
Time= 20.47000, dt= 0.00500 (Iter: 1 => Converg)
Time= 20.47500, dt= 0.00500 (Iter: 1 => Converg)
Time= 20.47500, dt= (Iter: 0 => fbd_Ite)
Time= 20.47500, dt= (Iter: 0 => fbd_Ite)
Time= 20.47500, dt= (Iter: 0 => fbd_Ite)
Time= 20.47500, dt= (Iter: 0 => fbd_Ite)
-----------------------------------------
Unable to apply the next load step. Analysis terminated
Total Analysis Time: 0h:9min:9sec

[z.gronti]

Dear vincenttt,
You can refer to Numerical instability, divergence and iteration prediction topic of the help system for more details.

[seismosoft]

vincenttt,

In addition to z-gronti's valid suggestion, we recall that, as noted in many Forum Posts already, a very common cause for the analysis behaviour that you are observing is actual structural failure.

And, clearly, if a structure has reached its ultimate capacity, there is not much you can do in order to get the analysis to continue; it simply can't...

Seismosoft Support