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STAAD Commands and Input Instructions
Section 5
5-320
UBC load case is not acceptable. Additional loads such as
MEMBER LOADS and JOINT LOADS may be specified
along with the UBC load under the same load case.
2) If the UBC cases are to be factored later in a Repeat Load
command; or if the UBC case is to be used in a
tension/compression analysis; or if Re-analysis (2 analysis
commands without a CHANGE or new load case in
between); then each UBC case should be followed by
PERFORM ANALYSIS then CHANGE commands as
shown in the example above. Otherwise the PERFORM
ANALYSIS then CHANGE can be omitted. Using the
CHANGE command will require the SET NL command to
define the maximum number of load cases being entered in
the analysis. Also LOAD LIST ALL should be entered
after the last PERFORM ANALYSIS command.
3) Up to 8 UBC cases may be entered.
Incorrect usage
LOAD 1
SELFWEIGHT Y -1
LOAD 2
JOINT LOAD
3 FX 45
LOAD 3
UBC LOAD X 1.2
JOINT LOAD
3 FY -4.5
LOAD 4
UBC LOAD Z 1.2
MEMBER LOAD
3 UNI GY -4.5
PERFORM ANALYSIS