Image Description - 0721-table1
A table is captioned “Table I. Primitive Variables and Uncertainties
for Probabilistic Structural Analysis of Space Truss (Random Input
Data). The table shows the distribution type, magnitude of the mean
value and scatter, in ± percentage for several primitive variables.
Primitive variables, which are identified in the first column, include
the geometry (width, length and height); loads (vertical, longitudinal,
couple and end moments); material property (modulus) and tube radii
(inner and outer). For the primitive variable of geometry (width) the
distribution type is Normal, the mean value is 60 inches and the
scatter is plus or minus 6.0 percent. For the primitive variable of
geometry (length) the distribution is normal, for the mean value of 96
inches the scatter is plus or minus 6.3 percent, for the mean value of
192 inches the scatter is plus or minus 7.5 percent, and for the mean
value of 288 inches the scatter is plus or minus 6.3 percent. For the
primitive variable of geometry (height) the distribution is normal, the
mean value is 72 inches, and the scatter is plus or minus 7.5 percent.
For the primitive variable of load (vertical) the distribution is
log-normal, the mean value is 200 pounds and the scatter is plus or
minus 6.3 percent. For the primitive variable of load (longitudinal),
the distribution is log-normal, the mean value is 200 pounds, and the
scatter is plus or minus 2.5 percent. For the primitive variable of
load (couple) the distribution is log-normal, the mean value is 0.7
pounds, and the scatter is plus or minus 6.3 percent. For the primitive
variable load (end moment for beam elements only) the distribution is
log-normal, the mean value is 50 pounds per inch, and the scatter is
plus or minus 6.3 percent. For the primitive variable of material
property (modulus) the distribution is normal, the mean value is 10 M
pounds per square inch, and the scatter is plus or minus 7.5 percent.
For the primitive variable of tube radius (outer) the distribution is
normal, the mean value is 0.5 inches, and the scatter is plus or minus
7.5 percent. For the primitive variable of tube radius (inner) the
distribution is normal, the mean value is 0.44 inches, and the scatter
is plus or minus 7.5 percent.