TR.26.3 Surface Constants Specification
Explained below is the command syntax for specifying constants for surface entities.
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.