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Buckling-Restrained Braces ( BRB ) Modelling
Posted: 27 Jul 2019, 16:51
by Mina Rizkalla
Dear All
can anyone help me model BRB (Buckling-Restrained Braces) please in SeismoStruct ?
Re: Buckling-Restrained Braces ( BRB ) Modelling
Posted: 29 Jul 2019, 13:47
by z.gronti
Dear Mina Rizkalla,
Please carry out a search on this forum for the term "buckling restrained".
Re: Buckling-Restrained Braces ( BRB ) Modelling
Posted: 02 May 2020, 21:53
by Mina Rizkalla
Dear Zoi Gronti
I modeled the BRB use truss element class and the cross section is CSS (Circular solid Section)
is that a correct way for the BRB modelling ?
Also what is the best Stress-Strain curve that best fits the steel material for the BRB ?
Re: Buckling-Restrained Braces ( BRB ) Modelling
Posted: 04 May 2020, 15:46
by seismosoft
Yes, provided that you have pinned joints at the braces ends.
Note also that, apart from the standards steel mterials, there is a special buckling restrained steel brace model stl_brb.
Seismosoft Support
Re: Buckling-Restrained Braces ( BRB ) Modelling
Posted: 03 Jun 2020, 08:43
by roshen.rj
seismosoft wrote: 04 May 2020, 15:46
Yes, provided that you have pinned joints at the braces ends.
Note also that, apart from the standards steel mterials, there is a special buckling restrained steel brace model stl_brb.
Seismosoft Support
https://ibb.co/MsBnbWz
How do I know the 'material properties' that need to be defined to correspond to the Stress-Strain plot? Is there a sample key that I can use to follow?
Re: Buckling-Restrained Braces ( BRB ) Modelling
Posted: 22 Jun 2020, 21:17
by Mina Rizkalla
How can I make sure that I have modeled (simulated) a correct BRB model element in SeismoStruct ?
Re: Buckling-Restrained Braces ( BRB ) Modelling
Posted: 23 Jun 2020, 13:46
by seismosoft
In general, by checking its response in the post-processor. However, a sample disply plot is also provided in the Materials dialog box.
Seismosoft Support
Re: Buckling-Restrained Braces ( BRB ) Modelling
Posted: 28 Jul 2020, 19:34
by Mina Rizkalla
After modelling and running the model, as I click on the "Post Processor" tab, a warning message "Axis Maximum Value must be >=Minimum".
how can I solve it ?
(despite the model is run, no results are able to be previewed)
Re: Buckling-Restrained Braces ( BRB ) Modelling
Posted: 29 Jul 2020, 14:59
by z.gronti
Dear Mina Rizkalla,
Could you please send me your file at
z.gronti@seismosoft.com to check it?
Re: Buckling-Restrained Braces ( BRB ) Modelling
Posted: 12 Aug 2020, 12:47
by z.gronti
Dear Mina Rizkalla,
When you assign pushover phases in opposite directions the program is not able to calculate the target displacement, that's why you receive the reported error. If you uncheck the checkbox for the calculation of the target displacement, you will be able to view the results of the analysis. We will fix the bug in the next release.
Finally, I would like to propose you to use the static time history analysis when you apply loading to both directions.