Seismosoft | Earthquake Engineering Solutions

Dear seismosoft,

Now I am carrying out some nonlinear dynamic time-history analysis of multi-storey frame. When I want to post-process the analysis results after finishing the analysis, in "Post-processor">"Stress and strain output">"Peak Strains and Stresses", there are some problems with me. I use 5 integration sections for both the beam and the column, and the Help System gives the approximate coordinates along the element's length of the integration sections but which coordinate is corresponding to which integration section?
e.g: 5 integration sections: [-1 -0.655 0 0.655 1] x L/2(measured from its baricentre), Does the section (1) correspond to the coordinate -1x L/2? And the section (2) correspond to the coordinate -0.655x L/2...?

In addition,some information occured in the analysis log.

Time= 2.13000, dt= 0.01000 (Iter: 2 => Converg)
Time= 2.13000, dt= (Iter: 1 => fbd_Ite)
Time= 2.13000, dt= (Iter: 1 => fbd_Ite)
Time= 2.13016, dt= 0.00016 (Iter: 1 => Converg)
Time= 2.13047, dt= 0.00031 (Iter: 1 => Converg)
Time= 2.13109, dt= 0.00062 (Iter: 1 => Converg)
Time= 2.13234, dt= 0.00125 (Iter: 1 => Converg)
Time= 2.13484, dt= 0.00250 (Iter: 1 => Converg)
Time= 2.13984, dt= 0.00500 (Iter: 2 => Converg)
Time= 2.14000, dt= 0.00016 (Iter: 1 => Converg)
Time= 2.15000, dt= 0.01000 (Iter: 2 => Converg)

Does the "fbd_ite" mean that not convergence?I read the Help System,but there's still some doubt with me. And whether the analysis results is accurate?

Best regards,
Wenjun

Dear Wenjun,

Yes, the position of the integration sections is as you assumed.

Yes, 'fbd_ite' means lack of convergence at element level, problem which is in your case then overcome by the automatic step subdivision - hence, yes, the results are accurate.

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