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Dipl.-Ing. (BA) Andreas Niemeier, M.Eng.
2019-05-20

Changing Tolerance Zones in Compliance with ÖNORM B 1991-1-3:2018-12

Why are the tolerance zones between the zone borders 5 km wide on the online snow load map of Austria?

Answer:

With National Annex ÖNORM B 1991‑1‑3:2018‑12, Austria has textually redrafted the width of tolerance zones.

[1] In the third paragraph under "Annex B", the standard states accordingly that within 2.5 km on both sides of the zone boundary, the characteristic value sk is the average of the affected zones. In the area of Vienna, we can assume 250 m per side. This results in the tolerance zone width of 2 x 2.5 km = 5 km in the country and 2 x 250 m = 500 m in Vienna.

This regulation was applied with the update of ÖNORM B 1991‑1‑3: 2018̩12 on our website Snow Load, Wind Speed, and Seismic Load Maps.

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Author

Mr. Niemeier is responsible for the development of RFEM, RSTAB, RWIND Simulation, and in the area of membrane structures. He is also responsible for quality assurance and customer support.

References
  1. Eurocode 1 — Einwirkungen auf Tragwerke: Teil 1-3: Allgemeine Einwirkungen - Schneelasten: Nationale Festlegungen zur ÖNORM EN 1991-1-3, nationale Erläuterungen und nationale Ergänzungen: ÖNORM B 1991-1-3:2018-12
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