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发表于 2006-12-6 13:24:20
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来自 四川大学
继续讨论中。。。。
document有说:
Defining layers of rebars in three-dimensional continuum elements
By default, the rebars in three-dimensional continuum elements are defined as layers lying in surfaces. The surfaces are most easily defined with respect to the isoparametric mapped cube of the element. Therefore, you must consider how the rebar will be defined before generating the mesh; if the rebar surfaces are not taken into account in designing the mesh, the rebar definition can be very inefficient.
根据这段话的意思好像是说rebar定义在membrane单元中,然后membrane单元所在的surface就得在剖分之前存在着,这样就能保证membrane单元的节点和solid的节点是耦合的,rebar把刚度传递给membrane的节点就相当于传递给了solid的节点
这样的操作还是勉强可以接受的,一般一个工程的锚杆也就十几层,再多一点的话可以做等截面的等效。
可是如果真的实现membrane单元和solid的单元的节点可以不耦合,那岂不会带来很多建模方面的便利。embedded element 也许能解决这个问题。
可是document有说:
The following limitations exist for the embedded element technique:
Elements with rotational degrees of freedom cannot be used as host elements.
Rotational, temperature, pore pressure, acoustic pressure, and electrical potential degrees of freedom at an embedded node are not constrained.
Host elements cannot be embedded themselves. ------------------------------------注意
The material defined for the host element is not replaced by the material defined for the embedded element at the same location of the integration point.
cannot embedded themselves到底不能自动化的程度有多深呢。是需要一个单元一个单元的指定呢,还是指定单元集合之间关系就可以了?
各位大虾希望能不吝赐教阿!!!!!!!!!!!
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