modeling of knee braced frame

[Behnam]

Hi Tim
tnx for all ur support.
finally,by ur help ,reached to the verifying model .
I defined initial imperfection using "Dicleli and Calik (2008)" formula which gives the most precise estimation of imperfection.(Modelling aspects of the seismic response of steel concentric braced frames,D'Aneillo 2013)
Considering the Panel Zone ,i used "Krawinkler method"which simulates the PZ resistance utilizing 2 Springs for the web and flange col resistance.
BR
Behnam

[huffte]

Glad to hear it, Behnam. May you have continued success in your work.