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STAAD Commands and Input Instructions
Section 5
5-288
5.32.8 Support Joint Displacement Specification
Purpose
This command may be used to specify DISPLACEMENTs (or
generate loads to induce specified displacements) in supported
directions (pinned, fixed, enforced, or spring).
General format:
SUP
PORT DISPLACEMENT
⎧FX ⎫
⎪FY ⎪
support joint-list
⎨FZ ⎬ f
1
⎪MX ⎪
⎪MY ⎪
⎩
MZ
⎭
FX, FY, FZ specify translational displacements in X, Y, and Z
directions respectively. MX, MY, MZ specify rotational
displacements in X, Y, and Z directions.
See Section
1.16.7
f
1
= Value of the corresponding displacement. For
translational displacements, the unit is in the currently
specified length unit, while for rotational displacements
the unit is always in degrees.
Description
There are two distinct modes of usage for this command. If any
“Enforced” specifications were used in the Support command then
the “Displacement mode” is used; otherwise the “Load mode” is
used. Despite the name of this command, if displacements are
specified in spring directions, the displacement is at the joint not
at the grounded end of the support spring. Displacement cannot be
specified in a direction that does not have a support or a spring.