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General Description
Section 1
1-56
1.14 Supports
STAAD allows specifications of supports that are parallel as well
as inclined to the global axes.
See
section 5.27
Supports are specified as PINNED, FIXED, or FIXED with
different releases (known as FIXED BUT). A pinned support has
restraints against all translational movement and none against
rotational movement. In other words, a pinned support will have
reactions for all forces but will resist no moments. A fixed support
has restraints against all directions of movement.
The restraints of a FIXED BUT support can be released in any
desired direction as specified in section 5.27.
Translational and rotational springs can also be specified. The
springs are represented in terms of their spring constants. A
translational spring constant is defined as the force to displace a
support joint one length unit in the specified global direction.
Similarly, a rotational spring constant is defined as the force to
rotate the support joint one degree around the specified global
direction.
For static analysis, Multi-linear spring supports can be used to
model the varying, non-linear resistance of a support (e.g. soil).
See section 5.27 for descriptions of the elastic footing and elastic
foundation mat facilities.
The Support command is also used to specify joints and directions
where support displacements will be enforced.