Pinch of hysteresis curve

[xiaoyan]

I'm doing a numerical simulation of a two-story frame under low cyclic loading, but I don't know how to consider the pinch of hysteresis curves? Thanks for your advice.

[Prafullamalla]

uniaxialMaterial Hysteretic . you have posted in different group under reliability analysis. So that you might not get response. Post in Opensees.exe user

# reinforcing steel
set Fy [expr 51*$ksi]; # STEEL yield stress
set Es [expr 30000.*$ksi]; # modulus of steel
set epsY [expr $Fy/$Es]; # steel yield strain
set Fy1 [expr 95.*$ksi]; # steel stress post-
set epsY1 0.03; # steel strain post-yield
set Fu [expr 95*$ksi]; # ultimate stress of steel
set epsU 0.08; # ultimate strain of steel
set Bs [expr ($Fu-$Fy)/($epsU-$epsY)/$Es]; # post-yield stiffness ratio of steel
set Bs [expr ($Fy1-$Fy)/($epsY1-$epsY)/$Es]; # post-yield stiffness ratio of steel
set pinchX 1; # pinching parameter for hysteretic model
set pinchY 1; # pinching parameter for hysteretic model
set damage1 0.0; # damage parameter for hysteretic model
set damage2 0.1; # damage parameter for hysteretic model
set betaMUsteel 0.30; # degraded unloading stiffness for hysteretic material based on MU^(-beta)
u
uniaxialMaterial Hysteretic $IDreinf $Fy $epsY $Fy1 $epsY1 $Fu $epsU -$Fy -$epsY -$Fy1 -$epsY1 -$Fu -$epsU $pinchX $pinchY $damage1 $damage2 $betaMUsteel ; # hysteritic reinforcemnet model