.. include:: sub.txt =================== CastFuse Material =================== .. function:: 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) :noindex: 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, :math:`P = P_p/\cos(2d/L)`, in which :math:`d` is the axial deformation of the brace at increment :math:`i` and :math:`P_p` is the yield strength of the CSF-brace and is given by the following expression :math:`P_p = nb_oh^2f_y/4L` The elastic stiffness of the CSF-brace is given by, :math:`K_p = nb_oEh^3f_y/6L^3` .. seealso:: `Notes `_