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hello dear frank

I have made a 3 story-2 bay model before and get true results after some dynamic analysis,but for 9 story 3 bay, I cannot reach to convergency in dynamic analysis a bit before and after the brace fracture.

would you please tell me how can I solve the convergence problem?

I got it. thank you very much dear friend.

hello dear frank hello dear vesna would you please tell me about the defference between iteration command in element nonlinearbeamcolumn and iteration in test command in transient analysis? Can I use a different tollerance for bracing element and another one for beam and column elements? I want to d...

hello again frank I have some problems with Dummy column. I made a three story braced frame before and it has worked, but not worked for 9 story braced frame. I faced with this errors: UMD2FA: matrix is singular. only 4968 pivots found. I know the problem is in likely missing some constraints. I don...

dear frank
believe me I did it with 15000 iterations but not worked...

frank
I really appreciate your concern. I will solve it as soon as possible. I think the problem is one other thing I know.

hello
and Again, as always, constructive suggestions, likes the final bullet in my head.

if I dont change my bracing model,what is your suggestion about using different tolerance, iteration or deltaT for a constant time step? I will remove "for" command.

hello dera frank I have a model of three story braced frame with initial material steel02 (dynamic analysis) with a strain limitation . so when the fiber-stressStrain of bracing member reach the strain limit,the stressStrain relation change to a extremely small elastic material (e.g. K=0.006 MPA) as...

be informed that the updated optimal combination of fatigue relevant to this study in new repost of PEER-2012 e0=.09 m=-.6

hello dear vesna i have modeled a three story- one bay frame that modeled with fatigue material developed by uriz and initial material steel02. it dosent work with this low cycle fatige script in drift capacity of cyclic analysis result available in nees projct . is this due to the ratio of b to t? ...

dear frank dear vesna i really need your help . . . i would remove all the bracing segments and their dunglin nodes, but during the analysis, when model reached its limitation by using eleResponse limit state and removed their element and related nodes , it faced with some errors. i think that i sho...

dear frank dear vesna i really need your help . . . i would remove all the bracing segments and their dunglin nodes, but during the analysis, when model reached its limitation by using eleResponse limit state and removed their element and related nodes , it faced with some errors. i think that i sho...

ofcourse... omm but should i remove the rotational springs in the first and end of the brace too in addition to removing the segments and dangling nodes of the brace?? how about the ghost trusses to the braces ( to diminish convergence problems )

dear frank
how about the ghost trusses to the braces ( to diminish convergence problems )
thank you for your attention t cmnts . . .

dear vesna hello thank u for ur attention; can i use the remove command like this for ElementS? set eleList "10006 11006 12006 13006" evel remove element $eleList ? for removing a brace that built ten segments,do i have to remove all of the segments to cansel of barce action? or there is a...

for removing a brace that built ten segments,do i have to remove all of the segments to cansel of barce action? or there is another way to do this easier? wasnt there any problem for example deleting elements for convergence problem?