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Section 5
5-267
Notes
1. The structure has to be modeled in such a way that the specified
global axis remains perpendicular to the floor plane(s).
2. For the FLOOR LOAD specification, a two-way distribution of the
load is considered. For the ONEWAY and AREA LOAD
specification, a one-way action is considered. For ONE WAY
loads, the program attempts to find the shorter direction within
panels for load generation purposes. So, if any of the panels are
square in shape, no load will be generated for those panels. For
such panels, use the FLOOR LOAD type.
3. FLOOR LOAD from a slab is distributed on the adjoining members
as trapezoidal and triangular loads depending on the length of the
sides as shown in the diagram. Internally, these loads are
converted to multiple point loads.
o
34
11
14
13
5
6
10
1
2
45
20'
10'
9
o
45
o
45
o
45
Figure 5.25
Members 1 and 2 get full trapezoidal
and triangular loads respectively.
Members 3 and 4 get partial
trapezoidal loads and 5 and 6 get
partial triangular load.
4. The load per unit area may not vary for a particular panel and it is
assumed to be continuous and without holes.
5. If the floor has a shape consisting of a mixture of convex and
concave edges, then break up the floor load command into several
parts, each for a certain region of the floor. This will force the
program to localize the search for panels and the solution will be
better. See illustrative example at the end of this section.
6. At least one quadrilateral panel bounded on at least 3 sides by
"complete" members has to be present within the bounds of the
user-defined range of coordinates (XRANGE, YRANGE and
ZRANGE) in order for the program to successfully generate
member loads from the FLOOR/ONEWAY LOAD specification. A
"complete" member is defined as one whose entire length between
its start and end coordinates borders the specified panel.