Steel01

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 >

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.gif

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

Steel01HystereticA.jpg

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

Steel01HystereticB.jpg

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

Steel01HystereticC.jpg

NOTES:

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

Code Developed by: Filip Filippou, UC Berkeley

Images Developed by: Silvia Mazzoni

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