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STAAD Commands and Input Instructions
Section 5
5-362
f
1
, f
2
... f
n
= corresponding factors
This command can be continued to additional lines by ending all
but last with a hyphen. These cases must have been between the
Perform Steady State Analysis command and the prior Analysis
command (if any).
Next is an optional force multiplier (amplitude) versus frequency
specification to be used when the force loading is a function of
frequency. For any forcing frequency an amplitude can be
determined, from the data below, which will multiply the forcing
loads entered above. If no amplitude data is entered then the
forcing loads are as entered above.
⎧X ⎫
AMP
LITUDE ⎨Y ⎬ ( A a B b C c )
⎩
Z
⎭
Leaving the direction field blank or inserting ALL will use the
same Frequency versus Amplitude for all 6 force directions.
Amplitude = a*ω
2
+ b*ω + c
ω = forcing frequency in rad/sec.
a, b, c = constants entered above. a & b default to zero and c
defaults to 1.0
---------------- or ------------------
⎧X ⎫
AMP
LITUDE ⎨Y ⎬
⎩
Z
⎭
(F1 A1 F2 A2 F3 A3…..)
Leaving the direction field blank or inserting ALL will use the
same Frequency versus Amplitude for all 6 force directions.