Hysteretic Material
Moderators: silvia, selimgunay, Moderators
Hysteretic Material
Silvia,
I would like to get a copy of an example that uses the Hysteretic Material, if you will.
Thanks,
MS
I would like to get a copy of an example that uses the Hysteretic Material, if you will.
Thanks,
MS
Migeum So
here is an excerpt from my materials definition:
Code: Select all
# backbone stressstrain curve parameters for all materials
set Fy [expr 66.8*$ksi]; # STEEL yield stress
set Es [expr 29000.*$ksi]; # modulus of steel
set epsY [expr $Fy/$Es]; # steel yield strain
set epsSH [expr 8*$epsY]; # strain at onset of Strain Hardening
set Esh [expr 0.02*$Es]; # tangent stiffness at onset of StrainHardening
set Bs 0.01; # strainhardening ratio
set Fy1 [expr 1.5*$Fy]; # steel stress postyield
set epsY1 [expr $epsY+($Fy1$Fy)/($Bs*$Es)]; # steel strain postyield
#set Fu [expr 1.5001*$Fy]; # ultimate stress of steel
#set epsU 0.25; # ultimate strain of steel
set Fu [expr 1*$Fy]; # ultimate stress of steel# 
set epsU 1.0; # ultimate strain of steel# 
# hystereticmaterial parameters  baseline
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 0.0; # damage parameter for hysteretic model
set betaMUsteel 0.0; # degraded unloading stiffness for hysteretic material based on MU^(beta)  make more like the rest.
# steel02 and steel03 parameters  baseline
set R0 18; # control the transition from elastic to plastic branches  make more like the rest.
set cR1 0.925; # control the transition from elastic to plastic branches
set cR2 0.15; # control the transition from elastic to plastic branches
set a2 0.1; # isotropic hardening parameter, associated with a1
set a1 [expr $a2*($Fy/$Es)]; # isotropic hardening parameter, increase of comp. yield envelope as proportion of yield strength after a plastic strain
set a4 0.1; # isotropic hardening parameter, associated with a3
set a3 [expr $a4*($Fy/$Es)]; # isotropic hardening parameter, increase of tension yield envelope as proportion of yield strength after a plastic strain
if { [info exists imat ] != 1} {set imat 0}; # set value only if it has not been defined previously.
uniaxialMaterial Elastic [set IDElastSteel [incr imat 1]] $Es; # elastic reinforcement
uniaxialMaterial Steel01 [set IDSteel01 [incr imat 1]] $Fy $Es $Bs; # bilinear reinforcement
uniaxialMaterial Steel02 [set IDSteel02 [incr imat 1]] $Fy $Es $Bs $R0 $cR1 $cR2
##remove
#uniaxialMaterial Steel02 [set IDSteel02 [incr imat 1]] $Fy $Es [expr 5*$Bs] 22 $cR1 $cR2
## remove
#set eta 0.25
#uniaxialMaterial ElasticPPGap [set IDSteel02 [incr imat 1]] $Es $Fy $epsY1 $eta 100
uniaxialMaterial Steel03 [set IDSteel03 [incr imat 1]] $Fy $Es $Bs $R0 $cR1 $cR2
uniaxialMaterial ReinforcingSteel [set IDReinforcingSteel [incr imat 1]] $Fy $Fy1 $Es $Esh $epsSH $epsY1
uniaxialMaterial Hysteretic [set IDHysteretic [incr imat 1]] $Fy $epsY $Fy1 $epsY1 $Fu $epsU $Fy $epsY $Fy1 $epsY1 $Fu $epsU $pinchX $pinchY $damage1 $damage2 $betaMUsteel ; # hysteritic reinforcemnet model
Silvia Mazzoni, PhD
Structural Consultant
Degenkolb Engineers
235 Montgomery Street, Suite 500
San Francisco, CA. 94104
Structural Consultant
Degenkolb Engineers
235 Montgomery Street, Suite 500
San Francisco, CA. 94104

 Posts: 9
 Joined: Sat Mar 09, 2013 6:07 am
 Location: azad unversity
Re: Hysteretic Material
Hi everyone.
i want to model rebar by the use of hystertic material , but unfotunately i have little information about this kind of material.i don't know how to calculate pinchX or another parameters.can you help me and introduce an article about it?
i want to model rebar by the use of hystertic material , but unfotunately i have little information about this kind of material.i don't know how to calculate pinchX or another parameters.can you help me and introduce an article about it?
Re: Hysteretic Material
Hello Silvia,
Could you direct us for understanding the material parameters "pinchX pinchY damage1 damage2 beta" of the hysteretic model for concrete reinforcement?
Thank you,
Baha
Could you direct us for understanding the material parameters "pinchX pinchY damage1 damage2 beta" of the hysteretic model for concrete reinforcement?
Thank you,
Baha
Re: Hysteretic Material
Dear Silvia,
I am getting this error:
Want: uniaxialMaterial Hysteretic tag? mom1p? rot1p? mom2p? rot2p? <mom3p? rot3p?>
mom1n? rot1n? mom2n? rot2n? <mom3n? rot3n?> pinchX? pinchY? damfc1? damfc2? <beta?>
while executing this command:
uniaxialMaterial Hysteretic 1 2.764e+03 2.516e02 2.764e+03 1.583e01 8.419e03 4.700e01 2.764e+03 2.516e02 2.764e+03 1.583e01 8.419e03 4.700e01 0.000e+00 0.000e+00 0.000e+00 0.000e+00 8.000e01
I need to model a steel structure for pushover analysis, I am using OpenSees 2.4.6 for Win7.
How could I model a steel structure with uniaxialMaterial Hysteretic?
Thank you so much
With my kind regards
I am getting this error:
Want: uniaxialMaterial Hysteretic tag? mom1p? rot1p? mom2p? rot2p? <mom3p? rot3p?>
mom1n? rot1n? mom2n? rot2n? <mom3n? rot3n?> pinchX? pinchY? damfc1? damfc2? <beta?>
while executing this command:
uniaxialMaterial Hysteretic 1 2.764e+03 2.516e02 2.764e+03 1.583e01 8.419e03 4.700e01 2.764e+03 2.516e02 2.764e+03 1.583e01 8.419e03 4.700e01 0.000e+00 0.000e+00 0.000e+00 0.000e+00 8.000e01
I need to model a steel structure for pushover analysis, I am using OpenSees 2.4.6 for Win7.
How could I model a steel structure with uniaxialMaterial Hysteretic?
Thank you so much
With my kind regards
Re: Hysteretic Material
what version and what os are you using
Re: Hysteretic Material
hello
how can i get value of this parameters???
please help...
thanks
how can i get value of this parameters???
please help...
thanks

 Posts: 1
 Joined: Sun Nov 08, 2015 6:48 am