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STAAD Commands and Input Instructions
Section 5
5-360
5.37.1.7 Harmonic Force Loading
This set of commands may be used to specify JOINT loads on the
structure, the modal damping, and the phase relationship of loads in
each of the global directions. Response at all of the frequencies
defined in section 5.37.1.2 will be calculated.
General format:
⎧ DAMP f ⎫
2
HAR
MONIC FORCE ⎨ CDAMP ⎬
⎩ MDAMP ⎭
This command specifies the damping for a case of harmonic forces.
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
phase angle of 0.0. All forces specified below will be applied with
the phase angle specified above, if any. Default is 0.0.