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STAAD Commands and Input Instructions
Section 5
5-354
5.37.1.5 Steady Force Loading
This set of commands may be used to specify JOINT loads on the
structure, the forcing frequency, the modal damping, and the phase
relationship of loads in each of the global directions.
General format:
⎧ DAMP f
2
⎫
STE
ADY FORCE FREQ f
1
⎨ CDAMP ⎬
⎩ MDAMP ⎭
This command specifies the forcing frequency and damping for a
case of steady forces.
FREQ. The f
1
value is the steady state frequency at which the
joint loads below will oscillate.
DAMP , MDAMP and CDAMP. Select source of damping input.
f
2
= Damping ratio for all modes. Default value is 0.05 (5%
damping if 0 or blank entered).
DAMP indicates to use the f
2
value for all modes.
MDAMP indicates to use the damping entered or computed with
the DEFINE DAMP command if entered, otherwise default value
of 0.05 will be used.
CDAMP indicates to use the composite damping of the structure
calculated for each mode. One must specify damping for different
materials under the CONSTANT specification.
General format:
*
⎧X ⎫
JOI
NT LOAD ( [ PHASE ⎨Y ⎬ f
7
] )
⎩
Z
⎭
Bracketed data may be entered for each global direction on the
same line. All moments specified below will be applied with a