Variations of Hysteretic Material

The command line for Hysteretic is as follows and is properly described in the previous sections and in the user command manual.

uniaxialMaterial Hysteretic $IDHystereticXa $Fy $epsY $Fy1 $epsY1 $Fu $epsU -$Fy -$epsY -$Fy1 -$epsY1 -$Fu -$epsU $pinchX $pinchY $damage1 $damage2 $betaMUsteel

The different control arguments were investigated as follows:

Shy	baseline
Sha	set pinchXx 0.8; # pinching parameter set pinchYx 0.2; # pinching parameter uniaxialMaterial Hysteretic $IDHystereticXa $Fy $epsY $Fy1 $epsY1 $Fu $epsU -$Fy -$epsY -$Fy1 -$epsY1 -$Fu -$epsU $pinchX $pinchY $damage1 $damage2 $betaMUsteel
Shb	set pinchXx 0.2; # pinching parameter set pinchYx 0.8; # pinching parameter uniaxialMaterial Hysteretic $IDHystereticXa $Fy $epsY $Fy1 $epsY1 $Fu $epsU -$Fy -$epsY -$Fy1 -$epsY1 -$Fu -$epsU $pinchX $pinchY $damage1 $damage2 $betaMUsteel
Shc	set damage1 0.01; # damage due to ductility: D1(mu-1) uniaxialMaterial Hysteretic $IDHystereticXb $Fy $epsY $Fy1 $epsY1 $Fu $epsU -$Fy -$epsY -$Fy1 -$epsY1 -$Fu -$epsU $pinchX $pinchY $damage1 $damage2 $betaMUsteel
Shd	set damage2 0.35; # damage due to energy: D2(Eii/Eult) uniaxialMaterial Hysteretic $IDHystereticXc $Fy $epsY $Fy1 $epsY1 $Fu $epsU -$Fy -$epsY -$Fy1 -$epsY1 -$Fu -$epsU $pinchX $pinchY $damage1 $damage2 $betaMUsteel
She	set betaMUsteel 0.5; # degraded unloading stiffness for hysteretic material based on MU^(-beta) uniaxialMaterial Hysteretic $IDHystereticXd $Fy $epsY $Fy1 $epsY1 $Fu $epsU -$Fy -$epsY -$Fy1 -$epsY1 -$Fu -$epsU $pinchX $pinchY $damage1 $damage2 $betaMUsteel

The backbone curve of each of these materials is shown in the following figures, tension in Figure 1, compression in Figure 2.

Figure 1. Backbone Curve for Hysteretic Stress-Strain Relationship -- Tension

Figure 2. Backbone Curve for Hysteretic Stress-Strain Relationship -- Compression

Key to Plot Legend -- variable Hysteretic

Shy	Hysteretic: baseline
Sha	Hysteretic: set pinchX 0.8; set pinchY 0.2
Shb	Hysteretic: set pinchX 0.2; set pinchY 0.8
Shc	Hysteretic: set damage1 0.01
Shd	Hysteretic: set damage2 0.35
She	Hysteretic: set betaMUsteel 0.5
Sp4	Pinching4: set rDispP 0.8; set rForceP 0.2;

In This Section

Hysteretic a,b,c,d,e -- Material Behavior

Variations of Hysteretic Material

Key to Plot Legend -- variable Hysteretic

Shy

Hysteretic: baseline

Sha

Hysteretic: set pinchX 0.8; set pinchY 0.2

Shb

Hysteretic: set pinchX 0.2; set pinchY 0.8

Shc

Hysteretic: set damage1 0.01

Shd

Hysteretic: set damage2 0.35

She

Hysteretic: set betaMUsteel 0.5

Sp4

Pinching4: set rDispP 0.8; set rForceP 0.2;