These elements are used to impose a linear relationship between the DOF of some nodes
They must refer to the material law: “BINDS” (ITYPE= 30)
Element type: 99
Implemented by: Bertarini I. (1986) & revised by Pascon F. (1999)

Example of relationship: $\displaystyle\sum_{i=1}^{m} \alpha_i . \delta_i = \alpha_0$
With:
$\delta_i$: the degree of freedom (translation or rotation: 1, 2 …)
$\alpha_i$ and $\alpha_0$: data specified in the section “COLAW” for the material: LMATE and specified in each relation
$m$: number of terms in the linear relationship

See example below

Prepro: BINDSA.F
Lagamine: BINDSB.F

The following section indicates the parameters to be written in the *.lag file. The parameters should be listed in tables. For better understanding, the table should indicate the format in the headline, then the list of parameters (see example below). Sub-sections can be used to separate different categories of parameters (integer, real).