BWBN Material
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< <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 BoucWen Material) |
| $Ao | parameter that controls tangent stiffness |
| $q $zetas $p $Shi $deltaShi $lambda | parameters that control pinching |
| $tol | tolerance |
| $maxIter | maximum iterations |
Fig. Cyclic force displacement relationship of the YSPDs generated using the BWBN material model
PARAMETER ESTIMATION:
EXAMPLE:
REFERENCES:
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.
