BWBN

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)).

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

matTag

integer tag identifying material

alpha ratio of post-yield stiffness to the initial elastic stiffenss ( \(0 \lt \alpha \lt 1\) )
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 \(\gamma\) and \(\beta\) softening, hardening or quasi-linearity can be simulated (look at the BoucWen Material)

Ao

parameter that controls tangent stiffness

q zetas p Shi deltaShi lambda

parameters that control pinching

tol

tolerance

maxIter

maximum iterations

BWBN_YSPD.jpg

Fig. Cyclic force displacement relationship of the YSPDs generated using the BWBN material model


PARAMETER ESTIMATION:

BWBNParameterEstimation


Examples

BWBNExample


REFERENCES:

Hossain, M. R., Ashraf, M., & Padgett, J. E. (2013). “Risk-based seismic performance assessment of Yielding Shear Panel Device.” Engineering Structures, 56, 1570-1579.

Hossain, M. R., & Ashraf, M. (2012). “Mathematical modelling of yielding shear panel device.” Thin-Walled Structures, 59, 153-161.

Baber, T. T., & Noori, M. N. (1986). “Modeling general hysteresis behavior and random vibration application.” Journal of Vibration Acoustics Stress and Reliability in Design, 108, 411.

Foliente, G. C. (1995). Hysteresis modeling of wood joints and structural systems. Journal of Structural Engineering, 121(6), 1013-1022.


DEVELOPED BY:

Raquib Hossain, The University of Queensland (UQ), Australia & Bangladesh University of Engineering and Technology (BUET), Bangladesh.

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