TR.31.5 Definition of Snow Load
This set of commands may be used to define some of the
parameters for generation of snow loads on the structure.
Refer to TR.32.12.4 Generation of Snow Loads or the definition of additional parameters and the surfaces to be loaded.
General Format
DEFINE SNOW LOAD
TYPE f1 PG f2 CE f3 CT f4 IM f5
Where:
| Parameter | Description |
|---|---|
| TYPE f1 | Type No: (limit of 100). The Type No. is an integer value (1, 2, 3, etc.) which denotes a number by which the snow load type will be identified. Multiple snow load types can be created in the same model. Include as many types as needed. |
| PG f2 | Ground Snow Load (Default = 0.0). The pressure or, weight per unit area, to be used for the calculation of the design snow load. Use a negative value to indicate loading acting towards the roof (upwards) as per section 7.2 of SEI/ASCE 7-02. |
| CE f3 | Exposure Factor (Default = 1.0). Exposure factor as per Table 7-2 of the SEI/ASCE-7-02 code. It is dependent upon the type of exposure of the roof (fully exposed/partially exposed/sheltered) and the terrain category, as defined in section 6.5.6 of the code. |
| CT f4 | Thermal Factor (Default = 0.0). Thermal factor as per Table 7-3 of the SEI/ASCE-7-02 code. It is dependent upon the thermal condition. |
| IM f5 | Importance Factor (Default = 1.0). Importance factor as per Table 7-4 of the SEI/ASCE-7-02 code. This value depends on the category the structure belongs to, as per section 1.5 and Table 1-1 of the code. |