4.13.5.2. CastFuse MaterialΒΆ
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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