求教!adina能分析加筋土的变形问题吗?

learner

请问各位大侠,我想用分析加筋土路堤的沉降变形问题,请问adina可以分析此问题吗?如果可以,筋体应该用什么单元,筋体和土体之间是否还要加入接触单元,哪种接触单元更符合此问题?

BosFEA

ADINA有rebar，很多时候可以用。
能画个图吗？

jinjinhao

感觉加筋土和钢筋还是不太一样,不知道能用rebar模拟不?

dali

ADINA中只有接触单元，库仑摩擦模型。

changqing

加筋土问题可采用Plaxis分析，Plaxis中有接触单元和筋带单元可供分析。
   
Interfaces: Joint elements are available to model soil structure interaction. For example, these elements may be used to simulate the thin zone of intensely shearing material at the contact between a tunnel lining and the surrounding soil. Values of interface friction angle and adhesion are generally not the same as the friction angle and cohesion of the surrounding soil.
  
Geogrids:  Geogrids (or geotextiles) are often used in practice for the construction of reinforced embankments or soil retaining structures. These elements can be simulated in PLAXIS by the use of special tension elements. It is often convenient to combine these elements with interfaces to model the interaction with the surrounding soil.
  
[iframe]http://www.plaxis.com/users/practice/app13.html[/iframe]

dali

看过我感觉Geogrids和Rebar没有什么区别，请问对否？

feizhang

好像的确没多大差别，只是名称不同。

BosFEA

不同软件中的功能往往都基于相同的力学理论，所有往往本质是相同的。

learner

再请问,adina中能否自己定义岩土的本构模型,如adina中没有duncan模型,是否可以自己定义,如果可以,如何定义?敬请解答,谢谢!

BosFEA

这需要用到ADINA的二次开发功能，肯定是可以由用户定义的。
开发的环境是Fortran，但如何定义要参考ADINA附带的一些程序例子了。

hzmhuzhimin123

不太明白，可以帮你顶一下

hzmhuzhimin123

额~~~，不好意思，没看时间，都这么早的帖子了

ycding

flac3d也有专门的geogrid单元，模拟加筋土的效果也比较好。
Geogrid Structural Elements—Geogrid structural elements (geogridSELs)
are three-noded, flat finite elements that are assigned a finite-element type that
resists membrane but does not resist bending loading. A physical membrane
can be modeled as a collection of geogridSELs. The geogridSEL behaves as
an isotropic or orthotropic, linearly elastic material with no failure limit. A
shear-directed (in the tangent plane to the geogrid surface) frictional interaction
occurs between the geogrid and the FLAC3D grid, and the geogrid is slaved
to the grid motion in the normal direction. A geogrid can be anchored at a
specific point in the FLAC3D grid or attached so that stress develops along its
surface in response to relative motion between the geogrid and the FLAC3D
grid. The geogrid can be thought of as the two-dimensional analogue of a
one-dimensional cable. GeogridSELs are used to model flexible membranes
whose shear interaction with the soil are important, such as geotextiles and
geogrids.