TR.26.3 Surface Constants Specification

Explained below is the command syntax for specifying constants for surface entities.

Note: Surface elements have been deprecated in STAAD.Pro CONNECT Edition. The analysis and design engine will allow them but their use is not recommended.

General Format

SURFACE CONSTANTS

{ E f1 | G f2 | POISSON f3 | DENSITY f4 | ALPHA f5 }  { LIST surface-list | ALL }

Where:

Parameter	Description
E f1	Young's Modulus (E)
G f2	Modulus of Rigidity (G)
POISSON f3	Poisson's ratio
DENSITY f4	weight density
ALPHA f5	coefficient of thermal expansion

In lieu of numerical values, built-in material names may be used for the above specification of constants. The built-in names are STEEL, CONCRETE, and ALUMINUM. See TR.26.2 Specifying Constants for Members and Elements for the values used in the built-in materials.

Example

SURFACE CONSTANTS
E 3150 LIST 1 TO 4
POISSON 0.17 ALL
DENSITY 8.68e-005 LIST 1 TO 4
ALPHA 5.5e-006 LIST 1 TO 4

Alternatively, where the material constants have been defined in a material object such as CONCRETE:

SURFACE CONSTANTS
MATERIAL CONCRETE LIST 1 TO 4

Notes

If G is not specified, but Poisson is specified, G is calculated from E/ [2 (1 + Poisson)].
If neither G nor Poisson is specified, Poisson is assumed based on E, and G is then calculated.
If G and Poisson are both specified, the input value of G is used, G is not calculated in this situation.
If G and Poisson are both required in the analysis, such as for the stiffness matrix of plate elements, and G is specified, but Poisson is not, then, Poisson is calculated from [(E/2G) –1].
To obtain a report of the values of these terms used in the analysis, specify the command PRINT MATERIAL PROPERTIES.