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