4.13.5.26. BoucWen Material¶

uniaxialMaterial('BoucWen', matTag, alpha, ko, n, gamma, beta, Ao, deltaA, deltaNu, deltaEta)

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