Apply drift loads to load cases on completion of the snow wizard

Tekla Structural Designer
2020
Tekla Structural Designer

Apply drift loads to load cases on completion of the snow wizard

The loads in the drifted snow load cases have to be applied manually as uniform snow, valley snow, or local drift snow loads. Any snow loads that are not appropriate for the selected load case cannot be selected.

Apply uniform snow loads

  1. In the Loading list, select a snow load case generated by the wizard appropriate for uniform snow.
  2. On the Load tab, click Snow Load > Uniform Snow.
  3. In the Properties window, adjust the load details according to your needs.
  4. To apply the load, click the relevant roof panel.
    Note: In the unbalanced cases, setting Roof type option to Pitched allows you to select whether the wind type of the load should be Windward or Leeward.

Apply a valley snow load

  1. In the Loading list,select a snow load case generated by the wizard appropriate for valley snow.
  2. On the Load tab, click Snow Load > Valley Snow.
  3. Select the left roof panel of the valley in which the load is applied.

    Tekla Structural Designer automatically determines the right panel, and calculates the valley load.

    Tip: If necessary, you can use apply a user override to the calculated load. Even if you rerun the Snow Wizard, Tekla Structural Designer maintains any user overrides that you have applied.
    Note: Graphic displays depict the loading magnitude of a snow load, and not depth of loading. Remember this when reviewing the load that has been calculated on structures like the low pitched valley model shown below:

    Although the above image appears to indicate snow load rising above the ridges, the display actually views the loading magnitude.

Apply a local drift snow load

  1. In the Loading list, select a snow load case generated by the wizard appropriate for local drift snow.
  2. On the Load tab, click Snow Load > Local Drift Snow.
  3. Go to the Properties window.
  4. Specify the drift type, and then enter the height, and any other parameters required to define the drift.
  5. In the model, select the roof panel edge where the drift is to form, taking care to click close to the required edge.
    Tip: The edge closest to the cursor is highlighted, if this isn't where you want the drift to form move the cursor toward the edge required before clicking to select.
  6. Click the start point of the drift on the highlighted edge.
  7. Click the end point of the drift on the highlighted edge.
    Tip: If necessary, you can use apply a user override to the calculated load. Even if you rerun the Snow Wizard, Tekla Structural Designer maintains any user overrides that you have applied.

Override snow loads

You can apply user overrides for snow load values and drift lengths, if necessary.

  1. Select the snow load.
  2. In the Properties window, select the Override load value option.
  3. Specify the override value.

    Tekla Structural Designer maintains the user overrides, even if you rerun the Snow Wizard.

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