Posts tagged ‘OS’

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分享一个小程序。  A small program to share with you.

  • 程序图标 ( Program Icon )

OSPLOTLOOPICON

  • 程序作者 ( Author)

JiDong Cui (崔济东) 1

1.华南理工大学  土木与交通学院;

  • 程序介绍 ( Program Introduction)

OpenSees Material Test将OpenSees ( Open System for Earthquake Engineering Simulation )中常用的单轴本构关系(钢及混凝土本构)提取出来,通过自行设计的界面进行测试,为今后更加深入的研究奠定基础。

  • 程序界面 ( Program Interface )

con01and con02

ro

OSMATTEST_Aout

  • 程序使用 ( Step to Use )

1

  • 例子 ( Examples )

con01

con01-2

  • 动画(Animation

视屏网址:http://v.youku.com/v_show/id_XMTUzOTczOTExMg==.html?from=y1.7-1.2#paction

  • 程序下载 ( Program Download )

[1] Help

[2] OSMatTest (.zip)

PS. 程序免费下载 ,欢迎大家给我提意见 ,敬请尊重劳动成果

  • 相关话题 ( Related Topics)

[1] OpenSees Concrete06 Material Test

[2] OpenSees ConcreteD Material Test

[3] OpenSees Concrete04 Material Test

[4] OpenSees Concrete02 Material Test

[5] OpenSees Concrete01 Material Test

[6] OpenSees RambergOsgoodSteel Material Test

[7] OpenSees Steel02 Material Test

[8] OpenSees Steel01 Material Test

  • 致谢 ( Acknowledgements )

感谢 林乐斌 师弟 帮忙整理帮助文档。


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  • 注释 ( Comments )

  ( 软件是免费的。如果你发现软件有bug或者软件使用有问题,请留言给我,或者通过邮箱联系我。邮箱:jidong_cui@163.com . 如果你喜欢这篇博文,请在上面给我 点个赞 吧! :-)   :-)   :-)

  (This app is free . If  you have found any bug in the program or have any problem when using the program, please don’t hesitate to contact me directly. Email : jidong_cui@163.com. If you like this posts, please give me a thumbs up rating on the above button! )

  • 微信公众号 ( Wechat Subscription)

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Concrete06是基于Thorenfeldt曲线建立的考虑混凝土抗拉强度、非线性受拉硬化及受压性能的单轴本构。

  • 材料参数(Material Parameters

Concrete06C

(Figure from : http://opensees.berkeley.edu/wiki/index.php/File:Concrete06C.png )

fc:混凝土28天抗压强度(concrete compressive strength at 28 days );

e0:混凝土峰值强度对应的应变,即fc对应的应变(concrete strain at maximum strength);

n:受压应力—应变曲线的形状系数(compression shape factor);

k:峰值压应力后的应力—应变曲线的形状系数(post-peak compression shape factor);

alphal:定义受压残余塑性应变的参数(α1 parameter for compression plastic strain definition);

fcr:混凝土抗拉强度(tensile strength);

ecr:抗拉峰值应力对应的应变(tensile strain at peak stress);

b:受拉硬化曲线的指数(exponent of the tension stiffening curve);

alpha2:定义受拉残余塑性应变的参数(α2 parameter for tensile plastic strain definition)。

  • 测试(Test

con06-material

con06-comp

con06-tensile

con06-comp-ten

  • 参考(References

[1] Concrete06 Material

  • 备注(Comments

感谢 林乐斌 师弟 帮忙整理文档。

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Concrete04受压部分的包络线采用Popovics (1973) 提出的单调荷载下的应力—应变关系,并根据Karsan-Jirsa加卸载准则确定其加卸载刚度(线性);受拉部分的包络线由线性上升段和指数下降段组成,其加卸载与再加载刚度取其与原点的割线刚度。(Concrete is a uniaxial Popovics concrete material object with degraded linear unloading/reloading stiffness according to the work of Karsan-Jirsa and tensile strength with exponential decay.)

  • 材料参数(Material Parameters

fc:混凝土28天抗压强度(concrete compressive strength at 28 days );

ec:混凝土峰值强度对应的应变,即fc对应的应变(concrete strain at maximum strength);

Ec:初始刚度(initial stiffness);

fct:混凝土抗拉强度(concrete tensile strength);

et:混凝土极限拉应变(ultimate tensile strain of concrete);

beta:应变达到etu时拉应力与峰值拉应力的比值(the exponential curve patameter to define the residual stress at etu)。

  • 测试(Test

con04-material

con04-ten

con04-comp

con04-comp-ten

  • 参考(References

[1] Concrete04

  • 备注(Comments

感谢 林乐斌 师弟 帮忙整理文档。

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Concrete02与Concrete01相比,考虑了混凝土的受拉力学性能(线性)。在受压方面,与Concrete01相同的是,考虑了混凝土随着残余应变的增大,加、卸载的刚度发生退化;不同的是,Concrete02在同一卸载过程,卸载的刚度也在发生退化。

  • 材料参数(Material Parameters

Concrete02

(PS. photo from http://opensees.berkeley.edu/wiki/index.php/File:Concrete02.jpg.)

fpc:混凝土28天抗压强度(concrete compressive strength at 28 days );

epsc0:混凝土峰值强度对应的应变,即fpc对应的应变(concrete strain at maximum strength);

fpcu:混凝土残余强度(concrete crushing strength);

epscu:混凝土残余强度对应的应变(concrete strain at crushing strength);

lambda:epscu处的卸载斜率与初始斜率的比值,初始斜率为2*fpc/epsc0(ratio between unloading slope at epscu and initial slope);

ft:混凝土抗拉强度(tensile strength);

Ets:混凝土受拉软化刚度(tension softening stiffness)。

  • 测试(Test

con02-1

con02-2

  • Concrete01 vs. Concrete02

con01and con02

  • 参考(References

[1] Concrete02

  • 备注(Comments

感谢 林乐斌 师弟 帮忙整理文档。

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Concrete01是OpenSees中最简单的单轴混凝土材料,它基于Kent-Scott-Park单轴混凝土本构模型,根据Karsan-Jirsa加卸载准则确定其加卸载刚度(线性),该材料不考虑混凝土受拉强度。(Concrete01 is a uniaxial Kent-Scott-Park concrete material object with degraded linear unloading/reloading stiffness according to the work of Karsan-Jirsa and no tensile strength.

  • 材料参数(Material Parameters

Concrete01

(PS. photo from http://opensees.berkeley.edu/wiki/index.php/File:Concrete01.gif .)

fpc:混凝土28天抗压强度(concrete compressive strength at 28 days );

epsc0:混凝土峰值强度对应的应变,即fpc对应的应变(concrete strain at maximum strength);

fpcu:混凝土残余强度(concrete crushing strength);

epscu:混凝土残余强度对应的应变(concrete strain at crushing strength

  • 测试(Test

con01

con01-2

  • 参考(References

[1] Concrete01

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关于 RambergOsgoodSteel Material 材料的信息参考 RambergOsgoodSteel Material。这里也顺便测试一下。

  • 材料参数(Material Parameters

Fy:屈服强度(yield strength);

E0:初始弹性模量(initial elastic tangent);

a:屈服时残余应变,通常取0.002("yield offset" and commonly used value for a is 0.002);

n:控制从弹性段向塑性段过度的参数,同时,当增大n时材料的强化速率会降低,通常取大于等于5(parameter to control the transition from elastic to plastic branches. And controls the harding of the material by increasing the "n" harding ratio will be decreased. Commonly used values for n are 5 or greater)。

  • 测试(Test

ro-material

ro

  • 参考(References

[1] RambergOsgoodSteel Material

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Steel02材料是单轴各向同性强化的Giuffre-Menegotto-Pinto钢材本构。Steel02是OpenSees中十分强大的一个单轴钢筋材料。通过设置其参数可以调整出多种意想不到的效果。作为初学者,我也要学习一下。

  • 材料参数(Material Parameters

Fy:屈服强度(yield strength);

E0:初始弹性模量(initial elastic tangent);

b:应变强化率,即屈服后斜率与初始弹性模量的比值(strain-hardening ratio, ratio between post-yield tangent and initial elastic tangent);

R0、cR1、cR2:控制从弹性段向塑性段过度的参数(parameters to control the transition from elastic to plastic branches, Recommended values: R0=between 10 and 20, cR1=0.925, cR2=0.15);

a1:等向强化参数(isotropic hardening parameter, increase of compression yield envelope as proportion of yield strength after a plastic strain of a2*Fy/E0);

a2:等向强化参数(isotropic hardening parameter);

a3:等向强化参数(isotropic hardening parameter, increase of tension yield envelope as proportion of yield strength after a plastic strain of a4*Fy/E0);

a4:等向强化参数(isotropic hardening parameter);

sigInit:初始应力值(initial stress value)。

从材料的参数可以发现,与Steel01基本类似,也具有Steel01的一些基本特性,同时可以分别考虑拉压方向的各向同性强化。

  • 测试(Test

(1)默认随动强化的滞回性能(Hysteretic Behavior of Model without Isotropic Hardening

s02

s02-kine

(2)受压向考虑强化滞回性能(Hysteretic Behavior of Model with Isotropic Hardening in Compression

s02-con-material

s02-comp-hard

(3)受拉向考虑强化的滞回性能(Hysteretic Behavior of Model with Isotropic Hardening in Tension

s02-ten-hard-material

s02-ten-hard

(4)同时考虑拉-压各向同性强化的滞回性能(Hysteretic Behavior of Model with Isotropic Hardening both in Tension and Compression)

s02-iso-material

s02-iso

  • 参考(References

[1] Steel02 Material

  • 备注(Comments

感谢 林乐斌 师弟 帮忙整理文档。

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学习一下OpenSees的钢筋材料 — Steel01,测试一下材料的性能。

Steel01是OpenSees中最简单的单轴钢筋材料,骨架曲线为二折线,滞回法则默认为随动强化(即可以考虑 包辛格效应 ),同时可以分别考虑拉压方向的各向同性强化。(Steel01 is a uniaxial bilinear steel material object in OpenSees. It is with kinematic hardening and optional isotropic hardening described by a non-linear evolution equation.

  • 模型参数(Material Parameters

Fy:屈服强度(yield strength);
E0:初始弹性模量(initial elastic tangent);
b:应变强化率,即屈服后斜率与初始弹性模量的比值(strain-hardening ratio, ratio between post-yield tangent and initial elastic tangent);
a1:等向强化参数(isotropic hardening parameter, increase of compression yield envelope as proportion of yield strength after a plastic strain of a2*Fy/E0);
a2:等向强化参数(isotropic hardening parameter);
a3:等向强化参数(isotropic hardening parameter, increase of tension yield envelope as proportion of yield strength after a plastic strain of a4*Fy/E0);
a4:等向强化参数(isotropic hardening parameter)。

  • 例子(Example

(1)默认随动强化的滞回性能(Hysteretic Behavior of Model without Isotropic Hardening

Steel01-1

Steel01-2

(2)受压向考虑强化滞回性能(Hysteretic Behavior of Model with Isotropic Hardening in Compression

Steel01-3

Steel01-4

(3)受拉向考虑强化的滞回性能(Hysteretic Behavior of Model with Isotropic Hardening in Tension

Steel01-5
Steel01-6

(4)同时考虑拉-压各向同性强化的滞回性能(Hysteretic Behavior of Model with Isotropic Hardening both in Tension and Compression)

Steel01-7

Steel01-8

  • 动画(Animation

视屏网址:http://v.youku.com/v_show/id_XMTUzOTczOTExMg==.html?from=y1.7-1.2#paction

一点点学习! :-)  :-)  8-)  8-)

  • 参考(References

[1] Steel01 Material

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