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Section 5
5-273
b) After the load is specified, if the user decides to
change the geometry of the structure (X, Y or Z
coordinates of the nodes of the regions over which the
floor load is applied), she/he has to go back to the load and
modify its data too, such as the XRANGE, YRANGE and
ZRANGE values. In other words, the 2 sets of data are not
automatically linked.
The above limitations may be overcome using a FLOOR GROUP.
A GROUP name is a facility which enables us to cluster a set of
entities – nodes, members, plates, solids, etc. into a single moniker
through which one can address them. Details of this are available
in section 5.16 of this manual.
The syntax of this command, as explained earlier in this section is:
FLO
OR LOAD
Floor-group-name FLOAD f3
⎪
⎭
⎪
⎬
⎫
⎪
⎩
⎪
⎨
⎧
GZ
GY
GX
where f3 = pressure on the floor
To create equal loads in all 3 global directions for mass definition
or other reasons, then enter direction labels for each direction
desired; GY first then GX and/or GZ.
Example
START GROUP DEFINITION
FLOOR
_PNL5A 21 22 23 28
END GROUP DEFINITION
LOAD 2 FLOOR LOAD on intermediate panel @ Y = 10 ft
FLOOR LOAD
_PNL5A FLOAD -0.45 GY
_PNL5A FLOAD -0.45 GY GX GZ