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

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拖了很久，最近搞东西用到BoucWen这个材料，从OpenSees中搬过来，写个程序测试一下，因为和最原始的Bouc Wen模型还有点不同。

最原始的BoucWen模型在这里做了测试：[研究][软件] BWTest: Bouc-Wen模型参数测试分析 [Bouc-Wen Hysteretic Model Parameters Analysis]

关于BoucWen Material 的OpenSees介绍在OpenSeesWiki中找到：BoucWen Material – OpenSeesWiki (berkeley.edu)

命令也搬过来：

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

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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 $deltaA	parameters that control tangent stiffness
$deltaNu $deltaEta	parameters that control material degradation

NOTES:

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