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Section 5
5-311
command to convert g’s to the acceleration units used in
that command. This is recommended due to possible unit
changes between that command and this command.]
Multiple loads at a joint-direction pair for a particular ( I
t
I
a
)
pair will be summed. However there can only be one ( I
t
I
a
)
pair associated with a particular joint-direction pair, the first
such entry will be used. Loads at slave joint directions will be
moved to the master without moment generation.
Either TIME LOAD or GROUND MOTION or both may be
specified under one load case. More than one load case for time
history analysis is not permitted.
For TIME LOAD data, multiple direction specifiers can be in one
entry as follows (the direction specifiers must be on one line and
missing values are assumed to be 1):
TIME LOAD
2 3 FX 1 FZ 1 4 -2.1 MX 2 2
6 7 FX FY FZ
Example
LOAD 1
SELFWEIGHT X 1.0
SELFWEIGHT Y 1.0
SELFWEIGHT Z 1.0
MEMBER LOADS
5 CON GX 7.5 10.0
5 CON GY 7.5 10.0
5 CON GZ 7.5 10.0
TIME LOAD
2 3 FX 1 3
5 7 FX 1 6
GROUND MOTION X 2 1