BWBN Material

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This command is used to construct a uniaxial Bouc-Wen smooth hysteretic material object that incorporates pinching.

uniaxialMaterial BWBN $matTag $alpha $ko $n $gamma $beta $Ao $q $zetas $p $Shi $deltaShi $lambda $tol $maxIter

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$matTag	integer tag identifying material
$alpha	ratio of post-yield stiffness to the initial elastic stiffenss (0< <math>\alpha</math> <1)
$ko	initial elastic stiffness
$n	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	parameters that control shape of hysteresis loop; depending on the values of <math>\gamma</math> and <math>\beta</math> softening, hardening or quasi-linearity can be simulated (look at the NOTES)
$Ao	parameters that control tangent stiffness

NOTES:

REFERENCES:

Md Raquibul Hossaina, Mahmud Ashrafb, Jamie E. Padgett(2013). "Risk-based seismic performance assessment of Yielding Shear Panel Device", Engineering Structures, Volume 56, November 2013, Pages 1570–1579