Steel02

This command is used to construct a uniaxial Giuffre-Menegotto-Pinto steel material object with isotropic strain hardening.

uniaxialMaterial Steel02 $matTag $Fy $E $b $R0 $cR1 $cR2
        <$a1 $a2 $a3 $a4 $sigInit>

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)

R0 CR1 CR2

parameters to control the transition from elastic to plastic branches. Recommended values: R0=between 10 and 20, cR1=0.925, cR2=0.15

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 default = 1.0).

a3

isotropic hardening parameter, increase of tension yield envelope as proportion of yield strength after a plastic strain of \(a4*(\)Fy/E0). (optional default = 0.0)

a4

isotropic hardening parameter (see explanation under \(a3). (optional default = 1.0)</p></td> </tr> <tr class="even"> <td><code class="parameter-table-variable">sigInit</code></td> <td><p>Initial Stress Value (optional, default: 0.0) the strain is calculated from epsP=\)sigInit/$E if (sigInit!= 0.0) { double epsInit = sigInit/E; eps = trialStrain+epsInit; } else eps = trialStrain;

more on OpenSees uniaxialMaterial Arguments – Steel02

REFERENCE:

Filippou, F. C., Popov, E. P., Bertero, V. V. (1983). “Effects of Bond Deterioration on Hysteretic Behavior of Reinforced Concrete Joints”. Report EERC 83-19, Earthquake Engineering Research Center, University of California, Berkeley.

Steel02 Material – Material Parameters of Monotonic Envelope

Steel02Monotonic.jpg

Steel02 Material – Hysteretic Behavior of Model w/o Isotropic Hardening

Steel02HystereticA.jpg

Steel02 Material – Hysteretic Behavior of Model with Isotropic Hardening in Compression

Steel02HystereticB.jpg

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

Steel02HystereticC.jpg

Code Developed by: Filip Filippou, UC Berkeley

Images Developed by: Silvia Mazzoni

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