Snow wizard (ASCE7)

Tekla Structural Designer
2021
Tekla Structural Designer

Snow wizard (ASCE7)

Summary

You can use the Snow wizard... to define sufficient site information to calculate the snow loadcases.

Location

  1. Ensure the snow loading code is set as ASCE7.
  2. On the Load tab, click Snow Load > Snow wizard...

Content

Button, command or option Description
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:

  • I
  • II
  • III
  • IV
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 loadcases (AISC Snow wizard) This page is used to specify the loadcases as follows:
Minimum Snow Load

Option are:

  • Yes
  • No
Balanced Snow Load

Option are:

  • Yes
  • No
Unbalanced Snow Load

Option are:

  • No
  • 1
  • 2
  • 3
  • 4

You can select between 1 and 4 cases to generate (1 Unbalanced..., 2 Unbalanced, etc.)

Draft Snow Load

Option are:

  • No
  • 1
  • 2
  • 3
  • 4

You can select between 1 and 4 cases to generate (1 Unbalanced..., 2 Unbalanced, etc.)

Rain on Snow Surcharge

Option are:

  • Yes
  • No
Finish Completes the Snow wizard... and sets up the loadcases based upon the input.
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