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STAAD Commands and Input Instructions
Section 5
5-348
This command directs the program to perform the analysis that
includes:
a) Checking whether all information is provided for the analysis;
b) Forming the joint stiffness matrix;
c) Solving simultaneous equations;
e) Solving for modes and frequencies;
f) Computing for the steady state joint displacements, velocities
& accelerations and phase angles;
g) Computing the above quantities versus frequency and
displaying the results graphically.
h) Member & element forces & stresses and support reactions are
not currently computed.
The first input after the Perform Steady State Analysis command
is:
⎧ STEADY ⎫ ⎧ FORCE ⎫
BEG
IN ⎨ HARMONIC
⎬ ⎨ GROUND ⎬
⎩ ⎭ ⎩
⎭
Steady or Harmonic
Steady = the analysis is at one forcing frequency.
Harmonic = the analysis is at several frequencies.
Force or Ground
Choose whether the loading is a distributed joint force load or
a ground motion.
This command selects which of the 4 load/analysis types, that are
available, will be used in this analysis. These four are described in
sections 5.37.1.4 through 5.37.1.7.
The steady state/harmonic analysis will calculate the maximum
displacement and the associated phase angle for each of 6 joint
directions, relative to the ground motion, for each frequency
defined in the next section.