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Section 5
5-325
Example
DEFINE 1893 LOAD
ZONE 0.05 RF 1.0 I 1.5 SS 1.0
SELFWEIGHT
JOINT WEIGHT
7 TO 12 WEIGHT 17.5
13 TO 30 WEIGHT 18.0
MEMBER WEIGHT
1 TO 20 UNI 2.0
LOAD 1 1893 LOAD IN X-DIRECTION
1893 LOAD X
JOINT LOAD
5 25 30 FY -17.5
LOAD 2 1893 LOAD IN Z-DIRECTION
1893 LOAD Z
LOAD 3 DEAD LOAD
SELFWEIGHT
LOAD COMBINATION 4
1 0.75 2 0.75 3 1.0
In the above example, the first two load cases are the 1893 load
cases. They are specified before any other load case.
Generation of Wind Load
The built-in wind load generation facility can be used to calculate
the wind loads based on the parameters defined in Section 5.31.3.
The following general format should be used to perform the wind
load generation. See section 1.17.3 for the two types of structures
on which the load can be generated. For closed type structures, the
panel areas bounded by beam members only (and ground), and
exposed to the wind, are used to define loaded areas (plates and
solids are ignored). The loads generated are applied only at the
joints at vertices of the bounded areas. For open type structures
also, generation is done considering only the members in the
model.