BWBN MaterialΒΆ

uniaxialMaterial('BWBN', matTag, alpha, ko, n, gamma, beta, Ao, q, zetas, p, Shi, deltaShi, lambda, tol, maxIter)

This command is used to construct a uniaxial Bouc-Wen pinching hysteretic material object. This material model is an extension of the original Bouc-Wen model that includes pinching (Baber and Noori (1986) and Foliente (1995)).

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 BoucWen Material)
Ao (float) parameter that controls tangent stiffness
q zetas p Shi deltaShi lambda (float) parameters that control pinching
tol (float) tolerance
maxIter (float) maximum iterations

See also