4.14.5.27. BWBN Material¶

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