Scope (BS6399-2 Wind wizard)

Tekla Structural Designer
Modified: 3 Oct 2019
2024
Tekla Structural Designer

Scope (BS6399-2 Wind wizard)

In the main, BS6399-2:1997 addresses rectilinear buildings. In order to develop a tool for engineers, we have extended this capability to address non-rectilinear buildings using the standard method. For more information, please refer to reference 7 (section 2.5.3.2.4, page 82 and 2.5.4.3.3 pages 89-90).

The scope of BS 6399-2 Wind Modeller encompasses:

  • Enveloping the building with wall panels and roof panels is undertaken in Tekla Structural Designer in the normal manner. There is only limited validation of the envelope defined (for example connected wall panels must have consistent normal directions). The onus is on you to model the building shape as completely and as accurately as you determine necessary.
  • Choice of method:
    • BS6399-2:1997 - Standard Method - Standard effective wind speeds with standard pressure coefficients,
    • BS6399-2:1997 - Hybrid Method - Directional effective wind speeds with standard pressure coefficients.
  • Basic Wind Speed and Dynamic pressure is determined.
  • Having defined wall panels and roof panels (defaults are standard wall, flat or monopitch roof depending on the slope), you are able to specify the type in more detail e.g. multi-bay, monopitch / duopitch etc.).
  • The main wind parameters, are calculated for you but conservatively, (for example Crosswind Breadth, B, is determined for the enclosing rectangle of the whole building). Wherever possible other parameters are determined conservatively, but you are able to override the values should you need to.
  • Given the above, zoning is semi-automatic, (not attempted for roofs with more than 4 sides which are defaulted to single conservative coefficient), with full graphical feedback.
  • Load decomposition is fully automatic where valid, (wall panels and roof panels need to be fully supported in the direction of span).
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