Snow wizard (Eurocode)

Tekla Structural Designer
2021
Tekla Structural Designer

Snow wizard (Eurocode)

Summary

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

Location

  1. Ensure the head code is set as Eurocode with the required National Annex.
  2. On the Load tab, click Snow Load > Snow wizard...

Plain Eurocode, Ireland and Sweden National Annex

Button, command or option Description
Page 1 - Basic data (Plain Eurocode, Ireland and Sweden National Annex) The following basic data is required:
Exposure Coefficient User defined value. (Default 1.0)
Thermal Coefficient User defined value. (Default 1.0)
Coefficient for Exceptional Snow Loads User defined value. (Default 1.0)
Snow Density Define the density of snow. (Default 2.0 kN/m2)
Snow Load User defined value. (No default value)
Next Click to proceed to the next page of the Snow wizard...
Page 2 - Snow loadcases (Plain Eurocode, Ireland and Sweden National Annex) On this page you specify the design situations to be considered.
Loadcase Automatically generated wind loadcase title. The loadcase title can be manually renamed if required.
Apply Options are:
  • Checked

    If checked the loadcase will be created.

  • Unchecked

    If unchecked the loadcase will not be created.

Note:

Undrifted (Cases A-1, B1-1, B1-3, B2-1, B3-1, B3-3)

  • Loads in these cases are generated automatically

Drifted Snow Load (Cases A-2, B1-2, B1-4, B2-2, B2-3, B3-2, B3-4)

  • You must create the loads in these cases manually
Note:

The EC/NA recommends which loadcases to apply.

Loadcase Type (Plain Eurocode and Ireland National Annex) Each loadcase has a loadcase type which can be:
  • Snow
  • Snow > 1000m
  • Snow Drift

Refer to EC 1991-1-3 Annex A, Table A1

Loadcase Type (Sweden National Annex) Each loadcase has a loadcase type which can be:
  • Snow
  • Snow Sk > 2 kN/m2
  • Snow Sk > 3 kN/m2
  • Snow Drift

Refer to EC 1991-1-3 Annex A, Table A1.

Number of wind directions to be considered for drifted snow

You can select between 1 and 4 separate loadcases to be generated for each 'Drifted' loadcase (identified by....1, ...2, etc. appended to the drifted loadcase name).

For example if you have checked the box to apply loadcase "Snow Load - Case A - 2) Drifted" and selected 2 wind directions, the following loadcases will be created:

  • Snow Load - Case A - 2) Drifted 1
  • Snow Load - Case A - 2) Drifted 2
Finish Completes the Snow wizard... and sets up the loadcases based upon the input.

UK National Annex

Button, command or option Description
Page 1 - Basic data (UK National Annex) The following basic data is required:
Exposure Coefficient User defined value. (Default 1.0)
Thermal Coefficient User defined value. (Default 1.0)
Coefficient for Exceptional Snow Loads User defined value. (Default 1.0)
Snow Density Define the density of snow. (Default 2.0 kN/m2)
Snow Load
Zone Number, Z Zone Number. (Default 2.0 kN/m2)
Altitude, A Altitude. (Default 1.0)
Characteristic Ground Snow Load, sk Characteristic ground snow load calculated as

sk = (0.15 + (0.1 * Z + 0.05)) + ((A - 100)/525)

Next Click to proceed to the next page of the Snow wizard...
Page 2 - Snow loadcases (UK National Annex) On this page you specify the design situations to be considered.
Loadcase Automatically generated wind loadcase title. The loadcase title can be manually renamed if required.
Apply Options are:
  • Checked

    If checked the loadcase will be created.

  • Unchecked

    If unchecked the loadcase will not be created.

Note:

Undrifted (Cases A-1, B1-1, B1-3, B2-1, B3-1, B3-3)

  • Loads in these cases are generated automatically

Drifted Snow Load (Cases A-2, B1-2, B1-4, B2-2, B2-3, B3-2, B3-4)

  • You must create the loads in these cases manually
Note:

The EC/NA recommends which loadcases to apply.

Loadcase Type Each loadcase has a loadcase type which can be:
  • Snow
  • Snow > 1000m
  • Snow Drift

Refer to EC 1991-1-3 Annex A, Table A1.

Number of wind directions to be considered for drifted snow

You can select between 1 and 4 separate loadcases to be generated for each 'Drifted' loadcase (identified by....1, ...2, etc. appended to the drifted loadcase name).

For example if you have checked the box to apply loadcase "Snow Load - Case A - 2) Drifted" and selected 2 wind directions, the following loadcases will be created:

  • Snow Load - Case A - 2) Drifted 1
  • Snow Load - Case A - 2) Drifted 2
Finish Completes the Snow wizard... and sets up the loadcases based upon the input.

Finland National Annex

Button, command or option Description
Page 1 - Basic data (Finland National Annex) The following basic data is required:
Topography Options are:
  • Windswept
  • Normal (Default)
  • Sheltered
Exposure Coefficient Value determined from Topography.
Thermal Coefficient User defined value. (Default 1.0)
Coefficient for Exceptional Snow Loads User defined value. (Default 1.0)
Snow Weight Density Define the density of snow. (Default 2.0 kN/m2)
Characteristic Ground Snow Load User defined value. (No default value)
Next Click to proceed to the next page of the Snow wizard...
Page 2 - Snow loadcases (Finland National Annex) On this page you specify the design situations to be considered.
Loadcase Automatically generated wind loadcase title. The loadcase title can be manually renamed if required.
Apply Options are:
  • Checked

    If checked the loadcase will be created.

  • Unchecked

    If unchecked the loadcase will not be created.

Note:

Undrifted (Cases A-1, B1-1, B1-3, B2-1, B3-1, B3-3)

  • Loads in these cases are generated automatically

Drifted Snow Load (Cases A-2, B1-2, B1-4, B2-2, B2-3, B3-2, B3-4)

  • You must create the loads in these cases manually
Note:

The EC/NA recommends which loadcases to apply.

Loadcase Type Each loadcase has a loadcase type which can be:
  • Snow
  • Snow, Sk > 2.75 kN/m2
  • Snow Drift
  • Ice

Refer to EC 1992-1-3 Annex A, Table A1.

Number of wind directions to be considered for drifted snow

You can select between 1 and 4 separate loadcases to be generated for each 'Drifted' loadcase (identified by....1, ...2, etc. appended to the drifted loadcase name).

For example if you have checked the box to apply loadcase "Snow Load - Case A - 2) Drifted" and selected 2 wind directions, the following loadcases will be created:

  • Snow Load - Case A - 2) Drifted 1
  • Snow Load - Case A - 2) Drifted 2
Finish Completes the Snow wizard... and sets up the loadcases based upon the input.

Norway National Annex

Button, command or option Description
Page 1 - Basic data (Norway National Annex) The following basic data is required:
Topography Options are:
  • Windswept
  • Normal (Default)
  • Sheltered
Exposure Coefficient Value determined from Topography.
Thermal Coefficient User defined value. (Default 1.0)
Coefficient for Exceptional Snow Loads User defined value. (Default 1.0)
Snow Weight Density Define the density of snow. (Default 2.0 kN/m2)
Altitude, H User defined value.
Basic Reference Altitude User defined value.
Basic Snow Load User defined value.
???? User defined value.
???? User defined value.
Characteristic Ground Snow Load Automatically determined from the above values.
Next Click to proceed to the next page of the Snow wizard...
Page 2 - Snow loadcases (Norway National Annex) On this page you specify the design situations to be considered.
Loadcase Automatically generated wind loadcase title. The loadcase title can be manually renamed if required.
Apply Options are:
  • Checked

    If checked the loadcase will be created.

  • Unchecked

    If unchecked the loadcase will not be created.

Note:

Undrifted (Cases A-1, B1-1, B1-3, B2-1, B3-1, B3-3)

  • Loads in these cases are generated automatically

Drifted Snow Load (Cases A-2, B1-2, B1-4, B2-2, B2-3, B3-2, B3-4)

  • You must create the loads in these cases manually
Note:

The EC/NA recommends which loadcases to apply.

Loadcase Type Each loadcase has a loadcase type which can be:
  • Snow
  • Snow > 1000m
  • Snow Drift

Refer to EC 1992-1-3 Annex A, Table A1.

Number of wind directions to be considered for drifted snow

You can select between 1 and 4 separate loadcases to be generated for each 'Drifted' loadcase (identified by....1, ...2, etc. appended to the drifted loadcase name).

For example if you have checked the box to apply loadcase "Snow Load - Case A - 2) Drifted" and selected 2 wind directions, the following loadcases will be created:

  • Snow Load - Case A - 2) Drifted 1
  • Snow Load - Case A - 2) Drifted 2
Finish Completes the Snow wizard... and sets up the loadcases based upon the input.
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