4.14.1.7. SteelMPFΒΆ

uniaxialMaterial('SteelMPF', matTag, fyp, fyn, E0, bp, bn, *params, a1=0.0, a2=1.0, a3=0.0, a4=1.0)

This command is used to construct a uniaxialMaterial SteelMPF (Kolozvari et al., 2015), which represents the well-known uniaxial constitutive nonlinear hysteretic material model for steel proposed by Menegotto and Pinto (1973), and extended by Filippou et al. (1983) to include isotropic strain hardening effects.

matTag (int)

integer tag identifying material

fyp (float)

Yield strength in tension (positive loading direction)

fyn (float)

Yield strength in compression (negative loading direction)

E0 (float)

Initial tangent modulus

bp (float)

Strain hardening ratio in tension (positive loading direction)

bn (float)

Strain hardening ratio in compression (negative loading direction)

params (list (float))

parameters to control the transition from elastic to plastic branches. params=[R0,cR1,cR2]. Recommended values: R0=20, cR1=0.925, cR2=0.15 or cR2=0.0015

a1 (float)

Isotropic hardening in compression parameter (optional, default = 0.0). Shifts compression yield envelope by a proportion of compressive yield strength after a maximum plastic tensile strain of a2(fyp/E0)

a2 (float)

Isotropic hardening in compression parameter (optional, default = 1.0).

a3 (float)

Isotropic hardening in tension parameter (optional, default = 0.0). Shifts tension yield envelope by a proportion of tensile yield strength after a maximum plastic compressive strain of a3(fyn/E0).

a4 (float)

Isotropic hardening in tension parameter (optional, default = 1.0). See explanation of a3.

See also

Notes