4.14.5.2. CastFuse MaterialΒΆ

uniaxialMaterial('Cast', matTag, n, bo, h, fy, E, L, b, Ro, cR1, cR2, a1=s2*Pp/Kp, a2=1.0, a3=a4*Pp/Kp, a4=1.0)

This command is used to construct a parallel material object made up of an arbitrary number of previously-constructed UniaxialMaterial objects.

matTag (int)

integer tag identifying material

n (int)

Number of yield fingers of the CSF-brace

bo (float)

Width of an individual yielding finger at its base of the CSF-brace

h (float)

Thickness of an individual yielding finger

fy (float)

Yield strength of the steel material of the yielding finger

E (float)

Modulus of elasticity of the steel material of the yielding finger

L (float)

Height of an individual yielding finger

b (float)

Strain hardening ratio

Ro (float)

Parameter that controls the Bauschinger effect. Recommended Values for $Ro=between 10 to 30

cR1 (float)

Parameter that controls the Bauschinger effect. Recommended Value cR1=0.925

cR2 (float)

Parameter that controls the Bauschinger effect. Recommended Value cR2=0.150

a1 (float)

isotropic hardening parameter, increase of compression yield envelope as proportion of yield strength after a plastic deformation of a2*(Pp/Kp)

a2 (float)

isotropic hardening parameter (see explanation under a1). (optional default = 1.0)

a3 (float)

isotropic hardening parameter, increase of tension yield envelope as proportion of yield strength after a plastic deformation of a4*(Pp/Kp)

a4 (float)

isotropic hardening parameter (see explanation under a3). (optional default = 1.0)

Gray et al. [1] showed that the monotonic backbone curve of a CSF-brace with known properties (n, bo, h, L, fy, E) after yielding can be expressed as a close-form solution that is given by, \(P = P_p/\cos(2d/L)\), in which \(d\) is the axial deformation of the brace at increment \(i\) and \(P_p\) is the yield strength of the CSF-brace and is given by the following expression

\(P_p = nb_oh^2f_y/4L\)

The elastic stiffness of the CSF-brace is given by,

\(K_p = nb_oEh^3f_y/6L^3\)

See also

Notes