refurbishment of rc member with steel profiles: modelling

[lombardi6]

Hello ,
I would modelling in Seismostruct a rectangular RC section with two flanked UPN profiles perfectly connected to the concrete (as in the linked picture). This intervention should increase the stiffness of the RC member. Someone could give me a suggestion for the modelling of this member?
Thanks in advance for your help
Luca
https://www.dropbox.com/s/gd99ndnct2b94 ... e.png?dl=0

[z.gronti]

Dear Lombardi,

You may model composite sections, like the one you describe, by inserting more than one elements to the same nodes with the use of rigid offset lengths.
You may find a SeismoStruct file with a section like the one you describe in the following link:
https://www.dropbox.com/s/00qa1arpz3jzn ... 1.spf?dl=0

[lombardi6]

Thank you!!!