Single Point Constraints

The interface program places the following comment cards at the start of the constraints section of the LR.STRAND input file.

$
$ SINGLE POINT CONSTRAINT CARDS ... 
$

Rigid constraints are defined using the command `PROPERTY BOUNDARY CONSTRAINT'. The user supplies a degree of freedom indicator (eg. 1234) to indicate which degrees of freedom are to be constrained.

The interface produces a series of SPC1 cards for all constrained nodes in the model for example:

$          SPCID     DOF       GIDS ...
SPC1           1    3456       1 THRU          5
SPC1           1  123456       6 THRU          6
SPC1           1    3456       7 THRU          9
SPC1           1   13456      10 THRU         10
SPC1           1    3456      11 THRU         13
SPC1           1   13456      14 THRU         14
SPC1           1    3456      15 THRU         17
SPC1           1   13456      18 THRU         18
SPC1           1    3456      19 THRU         21
SPC1           1   13456      22 THRU         22
SPC1           1    3456      23 THRU         25