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Section 5
5-347
5.37.1.1 Purpose
This analysis type is used to model steady, harmonically varying
load on a structure to solve for the steady harmonic response after
the initial transient response has damped out to zero. STAAD
Steady State analysis options include results for one forcing
frequency or for a set of frequencies. You may specify ground
motion or a distributed joint loading in one load case. Damping is
required either in this input or from the Modal Damp input or from
the Composite Damping input.
This command is used to specify the analysis request, specify that
the load case with the MODAL CALC command (which must be
prior to this analysis command) be used as the definition of the
mass distribution, and to begin a block of data input describing the
steady state forcing functions, the output frequencies, and the
printing of the joint responses.
All of the input and output frequencies are in Hertz (Hz or CPS).
Related topics can be found in the following sections:
Misc. Settings for Dynamics, Cut
off values, and mode selection
-
5.30
Frequency and Mode Extraction - 5.34
Modal & Composite Damping - 5.26.4,5
Analysis Specification - 5.37
Dynamic Analysis overview - 1.18.3
The Modal Calculation command is required in the weight/mass
definition load case. See section 5.34.
General format:
PER
FORM STEADY STATE ANALYSIS