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Section 5
5-167
displacement at the master plus the rigid rotation,
R SIN θ.
Notice that instead of providing a joint list for the slaved joints, a
range of coordinate values (in global system) may be used. All
joints whose coordinates are within the range are assumed to be
slaved joints. For convenience, the coordinate range specified for
slaved joints in this entry may include the master joint for this
entry. However, master and slave joints of other entries must not
be included in the coordinate range. All 2 or 3 ranges can be
entered to form a “tube” or “box” for selecting joints in the tube or
box region.
Fx, Fy etc. are the directions in which they are slaved (any
combination may be entered).
If two or more consecutive entries have the same master, the slave
lists will be merged. It is also OK to have different direction
specs.
The direction specifiers (XY, YZ, ZX) are combinations of the
basic directions, XY is the same as entering FX, FY, MZ; etc.
Any combination of direction specifiers may be entered. An
example of the use of this format is: a rigid diaphragm floor that
still retains bending flexibility entered as SLA ZX … .
If RIGID or if all directions are provided, the joints are assumed to
be rigidly connected.
Restrictions
•
Solid elements may not be connected to slave joints.
•
Master joints may not be slaves in another entry.
•
Slave joints may not be master or slaves in another entry.
•
Slave directions at joints may not be supported directions or
have displacements imposed.
•
Master and/or slave joints may not be inclined supports.
•
The master / slave specification is only intended for linear
static and dynamic analysis.
•
Multilinear springs are not permitted.