Steel01 Material

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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>

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

Steel01 Material -- Hysteretic Behavior of Model w/o Isotropic Hardening

Steel01 Material -- Hysteretic Behavior of Model with Isotropic Hardening in Compression

Steel01 Material -- Hysteretic Behavior of Model with Isotropic Hardening in Tension

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NOTES:

• If strain-hardening ratio is zero and you do not expect softening of your system use BandSPD solver.

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Code Developed by: Filip Filippou, UC Berkeley

Images Developed by: Silvia Mazzoni