3.1.5.1. Steel01 Material

This command is used to construct a uniaxial bilinear steel material object with kinematic hardening and optional isotropic hardening described by a non-linear evolution equation (REF: Fedeas).

uniaxialMaterial Steel01 $matTag $Fy $E0 $b <$a1 $a2 $a3 $a4>

Argument	Type	Description
$matTag	integer	integer tag identifying material
$Fy	float	yield strength
$E0	float	initial elastic tangent
$b	float	strain-hardening ratio (ratio between post-yield tangent and initial elastic tangent)
$a1	float	optional: isotropic hardening parameter: increase of compression yield envelope as proportion of yield strength after a plastic strain of $a2*($Fy/E0).
$a2	float	optional:isotropic hardening parameter (see explanation under $a1)
$a3	float	optional: isotropic hardening parameter: increase of tension yield envelope as proportion of yield strength after a plastic strain of $a4*($Fy/E0)
$a4	float	optional: isotropic hardening parameter (see explanation under $a3)

Note

By default there is no isotropic hardening.

Fig. 3.1.5.1 Steel01

Fig. 3.1.5.2 Steel01 Material – Default Hysteretic Behavior (NO isotropic hardening)

Fig. 3.1.5.3 Steel01 Material – Hysteretic Behavior of Model with Isotropic Hardening in Compression

Fig. 3.1.5.4 Steel01 Material – Hysteretic Behavior of Model with Isotropic Hardening in Tension

Example

The following is used to construct a Steel01 mataerial with a tag of 1, a yield strength of $60.0** and an initial tangent stiffness of 30000,0.

1. Tcl Code

uniaxialMaterial Steel01 60.0 30000.0

2. Python Code

uniaxialMaterial('Steel01',60.0,30000.0)

Code Developed by: Michael H. Scott