.. include:: sub.txt ============================= BoucWen Material ============================= .. function:: uniaxialMaterial('BoucWen', matTag,alpha, ko, n, gamma, beta, Ao, deltaA, deltaNu, deltaEta) :noindex: This command is used to construct a uniaxial Bouc-Wen smooth hysteretic material object. This material model is an extension of the original Bouc-Wen model that includes stiffness and strength degradation (Baber and Noori (1985)). =================================== =========================================================================== ``matTag`` |int| integer tag identifying material ``alpha`` |float| ratio of post-yield stiffness to the initial elastic stiffenss (0< alpha <1) ``ko`` |float| initial elastic stiffness ``n`` |float| parameter that controls transition from linear to nonlinear range (as n increases the transition becomes sharper; n is usually grater or equal to 1) ``gamma`` ``beta`` |float| parameters that control shape of hysteresis loop; depending on the values of gamma and beta softening, hardening or quasi-linearity can be simulated (look at the NOTES) ``Ao`` ``deltaA`` |float| parameters that control tangent stiffness ``deltaNu`` ``deltaEta`` |float| parameters that control material degradation =================================== =========================================================================== .. seealso:: `Notes `_