Page 1 - Basic data (ASCE7 Snow wizard) |
The following basic data is required: |
Ground snow load |
(No default) |
Terrain Category |
Options are:
- B (urban, suburban, wooded) - Default
- C (open terrain scattered obstructions),
- D (flat unobstructed areas), Above treeline, Alaska no trees
|
Exposure |
Options are:
- Fully exposed
- Partially exposed
|
Exposure factor, Ce |
Ce is determined from the following table:
|
Fully Exposed |
Fully Exposed |
Sheltered |
---|
B |
0.9 |
1 |
1.2 |
C |
0.9 |
1 |
1.1 |
D |
0.8 |
0.9 |
1 |
Above treeline |
0.7 |
0.8 |
0 |
Alaska |
0.7 |
0.8 |
0 |
|
Thermal Condition |
Option are:
- All except below
- Structures kept just above freezing
- Unheated open air structures
- Structures kept below freezing
- Continuously heated greenhouses
|
Thermal factor, Ct |
Ct is determined from the following table:
A |
1 |
B |
1.1 |
C |
1.2 |
D |
1.3 |
E |
0.85 |
|
Risk Category |
Option are:
|
Snow Importance factor, Is |
Is is determined from the following table:
I |
0.8 |
II |
1 |
III |
1.1 |
IV |
1.2 |
|
Flat Roof Snow load, , pf |
pf is determined from the following:
pf = 0.7 * Ce * Ct * Is * pg
|
Next |
Takes you to the next page. |
Page 2 - Snow load cases (AISC Snow wizard) |
This page is used to specify the loadcases as follows: |
Minimum Snow Load |
Option are:
|
Balanced Snow Load |
Option are:
|
Unbalanced Snow Load |
Option are:
You can select between 1 and 4 cases to generate (1 Unbalanced..., 2 Unbalanced, etc.)
|
Draft Snow Load |
Option are:
You can select between 1 and 4 cases to generate (1 Unbalanced..., 2 Unbalanced, etc.)
|
Rain on Snow Surcharge |
Option are:
|
Finish |
Completes the Snow wizard... and sets up the loadcases based upon the input. |