# [科研][软件][OpenSees] OSBWTest: OpenSees BoucWen Material Test ( OpenSees BoucWen材料测试)

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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)).

 uniaxialMaterial BoucWen $matTag$alpha $ko$n $gamma$beta $Ao$deltaA $deltaNu$deltaEta

 $matTag integer tag identifying material$alpha ratio of post-yield stiffness to the initial elastic stiffenss (0< $\alpha$ <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 NOTES) $Ao$deltaA parameters that control tangent stiffness $deltaNu$deltaEta parameters that control material degradation

NOTES:

1. Parameter $\gamma$ is usually in the range from -1 to 1 and parameter $\beta$ is usually in the range from 0 to 1. Depending on the values of $\gamma$ and $\beta$ softening, hardening or quasi-linearity can be simulated. The hysteresis loop will exhibit softening for the following cases: (a) $\beta$ + $\gamma$ > 0 and $\beta$ – $\gamma$ > 0, (b) $\beta$+$\gamma$ >0 and $\beta$-$\gamma$ <0, and (c) $\beta$+$\gamma$ >0 and $\beta$-$\gamma$ = 0. The hysteresis loop will exhibit hardening if $\beta$+$\gamma$ < 0 and $\beta$-$\gamma$ > 0, and quasi-linearity if $\beta$+$\gamma$ = 0 and $\beta$-$\gamma$ > 0.
2. The material can only define stress-strain relationship.

OSBWTest的功能是，可提供用户导入位移历程，指定材料的参数，获得相应的力-位移滞回曲线，可用于分析不同参数对BoucWen Material的影响。

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