Nodal Constraints

  A Nodal Constraints Data Set is denoted by a `KEY' of 41 in the data set header record. Constraint data for a single node is of the form:

KEY, NODE, IDOF, SYSID, EDOF

To be written with the format:

FORMAT(1X, I2, 4I5)

or: FORMAT (1X, I2, I10, 3I5) for 10 digit node number format

Where:

KEY = -1 for a data header record

= -3 for the data set delimiter record which is an otherwise blank record inserted at the end of the data set.

NODE = node number.

IDOF = degrees of freedom constrained 1 = x-translation 2 = y-translation 3 = z-translation 4 = x-rotation 5 = y-rotation 6 = z-rotation 9 = all Any integer which is a combination of at most five of the digits 1-6 is a valid constraint. For example, 534 is a valid integer as is 1234. The order in which freedoms are specified is not important.

SYSID = local system identifier for the constraints and externals. (=0 if no local system used)

EDOF = degrees of freedom made external 1 = x-translation 2 = y-translation 3 = z-translation 4 = x-rotation 5 = y-rotation 6 = z-rotation 9 = all Any integer which is a combination of at most five of the digits 1-6 is a valid external freedom.

Notes:

1.

Nodal Constraints should be input in the same order as the nodes are given in the nodal point co-ordinate data, but it is not necessary to give constraints for each node.