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- 程序图标 ( Icon )
- 程序介绍 ( Introduction)
应网友要求，编制这个 Pinching4 MatTest 程序，用于测试 OpenSees中的Pinching4 材料的特性。
OpenSees中的Pinching4 Material 是一个灵活度非常高的单轴滞回本构模型，该材料拟合“挤压”载荷变形响应，并在循环载荷下表现出退化。强度和刚度的循环退化有三种方式：卸载刚度退化、重新加载刚度退化和强度退化。此外，该本构允许拟合材料的正负非对称特性。该本构的详细介绍可查看这个官方链接：https://opensees.berkeley.edu/wiki/index.php/Pinching4_Material
我们把官网该材料的命令贴到下面：
This command is used to construct a uniaxial material that represents a ‘pinched’ load-deformation response and exhibits degradation under cyclic loading. Cyclic degradation of strength and stiffness occurs in three ways: unloading stiffness degradation, reloading stiffness degradation, strength degradation.
| uniaxialMaterial Pinching4 $matTag $ePf1 $ePd1 $ePf2 $ePd2 $ePf3 $ePd3 $ePf4 $ePd4 <$eNf1 $eNd1 $eNf2 $eNd2 $eNf3 $eNd3 $eNf4 $eNd4> $rDispP $rForceP $uForceP <$rDispN $rForceN $uForceN > $gK1 $gK2 $gK3 $gK4 $gKLim $gD1 $gD2 $gD3 $gD4 $gDLim $gF1 $gF2 $gF3 $gF4 $gFLim $gE $dmgType |
| $matTag | integer tag identifying material |
| $ePf1 $ePf2 $ePf3 $ePf4 | floating point values defining force points on the positive response envelope |
| $ePd1 $ePd2 $ePd3 $ePd4 | floating point values defining deformation points on the positive response envelope |
| $eNf1 $eNf2 $eNf3 $eNf4 | floating point values defining force points on the negative response envelope |
| $eNd1 $eNd2 $eNd3 $eNd4 | floating point values defining deformation points on the negative response envelope |
| $rDispP | floating point value defining the ratio of the deformation at which reloading occurs to the maximum historic deformation demand |
| $fFoceP | floating point value defining the ratio of the force at which reloading begins to force corresponding to the maximum historic deformation demand |
| $uForceP | floating point value defining the ratio of strength developed upon unloading from negative load to the maximum strength developed under monotonic loading |
| $rDispN | floating point value defining the ratio of the deformation at which reloading occurs to the minimum historic deformation demand |
| $fFoceN | floating point value defining the ratio of the force at which reloading begins to force corresponding to the minimum historic deformation demand |
| $uForceN | floating point value defining the ratio of strength developed upon unloading from negative load to the minimum strength developed under monotonic loading |
| $gK1 $gK2 $gK3 $gK4 $gKLim | floating point values controlling cyclic degradation model for unloading stiffness degradation |
| $gD1 $gD2 $gD3 $gD4 $gDLim | floating point values controlling cyclic degradation model for reloading stiffness degradation |
| $gF1 $gF2 $gF3 $gF4 $gFLim | floating point values controlling cyclic degradation model for strength degradation |
| $gE | floating point value used to define maximum energy dissipation under cyclic loading. Total energy dissipation capacity is defined as this factor multiplied by the energy dissipated under monotonic loading. |
| $dmgType | string to indicate type of damage (option: “cycle”, “energy”) |
- 程序截屏 ( screenshot)
我们可以采用该软件，复刻连接 https://opensees.berkeley.edu/wiki/index.php/Pinching4MaterialExample 里面的材料测试案例，如下图所示：
Video 视频演示
- 如何获得软件 ( How to get this program )
( 如果您需要使用这个软件，请在这给网站捐助：http://www.jdcui.com/?page_id=4813，捐助不少于【250RMB】，捐助后在评论区留下您的评论，软件将通过网站客服号QQ（3014479529）给您发送，敬请尊重劳动成果 ！！捐助者可以通过客服号进行相关研究问题及软件使用问题讨论。)
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Hola, he donado pero no he tenido el software
Please send the voucher to my email： jidong_cui@163.com
你好，已捐助，麻烦发一下软件，谢谢！
您好 这个软件是直接导入滞回曲线出结果吗
没有，导入你的位移历程曲线，去测试本构参数是否合适。
期待老师更新！
崔老师，这个更新了吗？
还没
可以实现Pinching4的参数识别吗？
参数该复合求解？