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Section 1
1-55
1.13 Material Constants
The material constants are: modulus of elasticity (E); weight
density (DEN); Poisson's ratio (POISS); co-efficient of thermal
expansion (ALPHA), Composite Damping Ratio, and beta angle
(BETA) or coordinates for any reference (REF) point.
See
section 5.26
E value for members must be provided or the analysis will not be
performed. Weight density (DEN) is used only when selfweight of
the structure is to be taken into account. Poisson's ratio (POISS) is
used to calculate the shear modulus (commonly known as G) by
the formula,
G = 0.5 x E/(1 + POISS)
If Poisson's ratio is not provided, STAAD will assume a value for
this quantity based on the value of E. Coefficient of thermal
expansion (ALPHA) is used to calculate the expansion of the
members if temperature loads are applied. The temperature unit for
temperature load and ALPHA has to be the same.
Composite damping ratio is used to compute the damping ratio for
each mode in a dynamic solution. This is only useful if there are
several materials with different damping ratios.
BETA angle and REFerence point are discussed in Sec 1.5.3 and
are input as part of the member constants.
Note: Poisson’s Ratio must always be defined after the Modulus of
Elasticity for a given member/element.