混凝土变形局部化试验研究及有限元后处理程序开发
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摘要
大型混凝土工程如高坝、核电站、交通和军事工程中混凝土的损伤塑性问题是亟待解决的难题。本文围绕混凝土材料与结构的塑性损伤分析问题做了以下4方面的工作。
(1)用数字散斑相关方法研究了单边预制缺口梁和双边预制缺口梁在不同的边界条件下,在四点剪切加载的情况下的破坏现象。观察到了混凝土的变形局部化现象,通过试验证明边界条件的不同对试验结果的影响很大,在用四点剪切试验验证理论时,应仔细处理支座与试件间的接触。
(2)采用四点剪切混凝土梁模型,使用ABAQUS/Explicit作为数值工具。以双边缺口梁和单边缺口梁为对象,对混凝土构件的塑性损伤演化行为进行了数值模拟研究,计算出了混凝土损伤过程区的长度,供梯度依赖损伤模型为特征长度取值时提供参考。
(3)使用FORTRAN语言,在AutoCAD的平台上编写了一个程序。这个程序能够结合有限元网格及数值分析结果的特点和AutoCAD所提供的图元,按照AutoCAD图形交换文件的格式把有限元数值计算结果写到AutoCAD的.DXF文件中,从而实现了在AutoCAD界面下将有限元网格及数值分析结果可视化。以一个井孔稳定二维弹塑性有限元数值分析为例,实现了该有限元分析网格及数值结果的可视化,生成了井孔模型的网格图、变形图和应力分布等值线图。
(4)通过ABAQUS软件提供的UMAT子程序将一种新的考虑应力三轴比依赖特性的塑性损伤本构模型植入到现有的ABAQUS软件的材料库中,并用UVARM子程序将自定义的损伤变量输出到结果文件.odb中,进行结果的图形显示。通过混凝土立方体单元单轴受拉算例验证了模型和程序的有效性。
Plasticity and damage problems need to be settled urgently for large concrete projects such as high dams, nuclear power station, highway and military works. Four aspects were done about the problem of plasticity and damage analysis for concrete materials and structures.
(1) The digital speckle correlation method (DSCM) was used to study on the destruct phenomena of concrete beams with single-edge notched and double-edge notched under which are in the different boundary conditions, loaded with four-point-shear force. The deformation localizability phenomena are observed, the results shows that the influence of boundary conditions to the test is important. So the contact between specimen and supports should be treated well.
(2) Numerical simulations were done on evolution of damage process zone of concrete structures, and the size and evolution of damage process zone were studied. The geometrical model adopted is four-point-shearing beam, and Abaqus/Explicit software was taken as the numerical tool.
(3) With FORTRAN language, the software was developed on the basis of AutoCAD plat form. With this software, mesh and numerical results obtained from a Finite Element Analysis can be converted into DXF file at AutoCAD environment. Consequently visualization of results of Finite Element Analysis can be realized. Numerical results of 2-dimensional elastoplastic finite element analysis of an oil well were taken as examples for validation purpose of the software developed here. Mesh and deformed mesh along with stress distribution were visualized.
(4) New damage model coupled with plasticity for concrete has been implemented into Abaqus via UMAT subroutine for concrete. The new damage model has property of triaxiality dependent hardening. Numerical results of damage fields obtained with the new implemented model have been exported to the ODB file which is the storage file of numerical results prepared for postprocess via UVARM subroutine. FORTRAN language was used. Validation of the UMAT subroutine developed here was carried out with an example of one-element cubic block under uniaxial compression and an example of a simple-supported beam under concentrated force in the middle of the beam. Numerical results indicate that the UMAT subroutine developed here has improved the ability of Abaqus software in simulating the plastic damage behavior of concrete.
(1)用数字散斑相关方法研究了单边预制缺口梁和双边预制缺口梁在不同的边界条件下,在四点剪切加载的情况下的破坏现象。观察到了混凝土的变形局部化现象,通过试验证明边界条件的不同对试验结果的影响很大,在用四点剪切试验验证理论时,应仔细处理支座与试件间的接触。
(2)采用四点剪切混凝土梁模型,使用ABAQUS/Explicit作为数值工具。以双边缺口梁和单边缺口梁为对象,对混凝土构件的塑性损伤演化行为进行了数值模拟研究,计算出了混凝土损伤过程区的长度,供梯度依赖损伤模型为特征长度取值时提供参考。
(3)使用FORTRAN语言,在AutoCAD的平台上编写了一个程序。这个程序能够结合有限元网格及数值分析结果的特点和AutoCAD所提供的图元,按照AutoCAD图形交换文件的格式把有限元数值计算结果写到AutoCAD的.DXF文件中,从而实现了在AutoCAD界面下将有限元网格及数值分析结果可视化。以一个井孔稳定二维弹塑性有限元数值分析为例,实现了该有限元分析网格及数值结果的可视化,生成了井孔模型的网格图、变形图和应力分布等值线图。
(4)通过ABAQUS软件提供的UMAT子程序将一种新的考虑应力三轴比依赖特性的塑性损伤本构模型植入到现有的ABAQUS软件的材料库中,并用UVARM子程序将自定义的损伤变量输出到结果文件.odb中,进行结果的图形显示。通过混凝土立方体单元单轴受拉算例验证了模型和程序的有效性。
Plasticity and damage problems need to be settled urgently for large concrete projects such as high dams, nuclear power station, highway and military works. Four aspects were done about the problem of plasticity and damage analysis for concrete materials and structures.
(1) The digital speckle correlation method (DSCM) was used to study on the destruct phenomena of concrete beams with single-edge notched and double-edge notched under which are in the different boundary conditions, loaded with four-point-shear force. The deformation localizability phenomena are observed, the results shows that the influence of boundary conditions to the test is important. So the contact between specimen and supports should be treated well.
(2) Numerical simulations were done on evolution of damage process zone of concrete structures, and the size and evolution of damage process zone were studied. The geometrical model adopted is four-point-shearing beam, and Abaqus/Explicit software was taken as the numerical tool.
(3) With FORTRAN language, the software was developed on the basis of AutoCAD plat form. With this software, mesh and numerical results obtained from a Finite Element Analysis can be converted into DXF file at AutoCAD environment. Consequently visualization of results of Finite Element Analysis can be realized. Numerical results of 2-dimensional elastoplastic finite element analysis of an oil well were taken as examples for validation purpose of the software developed here. Mesh and deformed mesh along with stress distribution were visualized.
(4) New damage model coupled with plasticity for concrete has been implemented into Abaqus via UMAT subroutine for concrete. The new damage model has property of triaxiality dependent hardening. Numerical results of damage fields obtained with the new implemented model have been exported to the ODB file which is the storage file of numerical results prepared for postprocess via UVARM subroutine. FORTRAN language was used. Validation of the UMAT subroutine developed here was carried out with an example of one-element cubic block under uniaxial compression and an example of a simple-supported beam under concentrated force in the middle of the beam. Numerical results indicate that the UMAT subroutine developed here has improved the ability of Abaqus software in simulating the plastic damage behavior of concrete.
引文
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