Giuffre-Menegotto-Pinto Model with Isotropic Hardening – stl_gmp

This is a uniaxial Giuffre-Menegotto-Pinto Material with optional isotropic hardening described by a non-linear rule. The transition from elastic to plastic behaviour is described by the Giuffre-Menegotto-Pinto Model. The material model was described in full detail by Filippou et al. [1983]. The material should be mainly utilized for the modelling of the behaviour of reinforcing steel in reinforced concrete structures, especially in the case when load reversals occur. Users have to assign the mean value of steel strength and the mean value minus the standard deviation or the characteristic value in order to describe the mechanical characteristics of the existing or the new material respectively.

Modulus of elasticity - Es
the default value is 200 GPa

Yield strength - fy
the default value is 500 MPa

Strain hardening ratio -
the default value is 0.005

Initial Value of Curvature Parameter - R0
the default value is 20

Curvature Degradation Parameter - R1
the default value is 0.925

Curvature Degradation Parameter - R2
the default value is 0.15

Isotropic Hardening in Compression Parameter - A1
the default value is 0.1

Isotropic Hardening in Compression Parameter - A2
the default value is 7

Isotropic Hardening in Tension Parameter - A3
the default value is 0.1

Isotropic Hardening in Tension Parameter - A4
the default value is 7

Initial Stress - 0
the default value is 0 MPa

Fracture / Buckling Strain -
The default value is 0.1

Specific Weight -
The default Value is 78.00 kN/m3