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STAAD Commands and Input Instructions
Section 5
5-340
5.37 Analysis Specification
Purpose
STAAD analysis options include linear static analysis, P-Delta (or
second order analysis), and several types of Dynamic analysis.
This command is used to specify the analysis request. In addition,
this command may be used to request that various analysis related
data, like load info, statics check info, etc. be printed.
General format:
⎧LOAD DATA ⎫
⎧PERFORM ⎫ ⎪STATICS CHECK ⎪
⎨
⎬ ANALYSIS (PRINT ⎨STATICS LOAD ⎬)
⎪Perform Steady State ⎪ ⎪ ⎪
⎪PERFORM CABLE ⎪ ⎪ ⎪
⎩PER
form IMPerfection ⎭ ⎪ ⎪
⎪BOTH ⎪
⎩
ALL
⎭
(Perform Steady State is described in the next section, 5.37.1)
PDE
LTA (n) ANALYSIS (CONVERGE (m)) (PRINT LOAD DATA)
Where n = no. of iterations desired (default value of n = 1).
This command directs the program to perform the analysis that
includes:
See Section
1.18
a) Checking whether all information is provided for the analysis;
b) Forming the joint stiffness matrix;
c) Checking the stability of the structure;
d) Solving simultaneous equations, and
e) Computing the member forces and displacements.
f) If P-Delta analysis is specified, forces and displacements are
recalculated, taking into consideration the P-Delta effect.