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STAAD Commands and Input Instructions
Section 5
5-132
E specifies Young's Modulus. This value must be
provided before the POISSON for each
member/element in the Constants list.
G specifies Shear Modulus. Enter only for beams &
plates and when Poisson would not be 0.01 to
0.499.
POISSON specifies Poisson's Ratio. If G is not entered, then
this value is used for calculating the Shear
Modulus (G=0.5xE/(1+POISSON)). Must be 0.01
to 0.499. Poisson must be entered when Poisson
cannot be computed from G.
DENSITY specifies weight density.
ALPHA Co-efficient of thermal expansion.
CDAMP Damping ratio to be used in computing the modal
damping by the composite damping method.
BETA specifies member rotation angle in degrees
(see Section 1.5.3).
Note : Single angle sections are oriented according
to their principal axes by default. If it is necessary
to orient them such that their legs are parallel to
the global axes, the BETA specification must be
used. STAAD offers the following additional
specifications for this purpose :
BETA ANGLE
BETA RANGLE
Both of the above options will result in an
orientation with the legs parallel to the global axis.
The 'ANGLE' option rotates the section through
the angle (90 - "alpha") (where "alpha" = angle
between the principal axis system and the global
axis system). [Please review the figures on the