[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

$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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4 thoughts on “[科研][软件][OpenSees] OSBWTest: OpenSees BoucWen Material Test ( OpenSees BoucWen材料测试)

  1. 晏颖琦 Reply

    崔博士,请问opensees中能考虑拉压不一致的模型本构吗

  2. 刺心 Reply

    崔博士,小白想问一些opensees的混凝土墩柱Bouc-Wen模型本构参数怎么确定啊,还有定义截面时,是直接把单轴b-c拿过来用吗?

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