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Section 5
5-319
where i = load case number
f1 = factor to be used to multiply the UBC Load
(default = 1.0). May be negative.
f2 = factor to be used to multiply the UBC, IBC, 1893,
etc. Accidental torsion load (default = 1.0). May be
negative.
Use only horizontal directions.
Example
DEFINE UBC LOAD
ZONE 0.2 K 1.0 I 1.5 TS 0.5
SELFWEIGHT
JOINT WEIGHT
1 TO 100 WEIGHT 5.0
101 TO 200 WEIGHT 7.5
LOAD 1 UBC IN X-DIRECTION
UBC LOAD X
JOINT LOAD
5 25 30 FY -17.5
PERFORM ANALYSIS
CHANGE
LOAD 2 UBC IN Z-DIRECTION
UBC LOAD Z
PERFORM ANALYSIS
CHANGE
LOAD 3 DEAD LOAD
SELFWEIGHT
LOAD COMBINATION 4
1 0.75 2 0.75 3 1.0
In the above example, notice that the first two load cases are UBC
load cases. They are specified before any other load cases.
Notes
1) The UBC load cases should be provided as the first set of
load cases. Non-UBC primary load case specified before a