Ice cap area for snow load calculation

[Ashok Mathur]

Does anybody have experience has to the method adopted by town planning authorities whilre checking for snow load.

I would say that the roof of a dome should be confined to area that has a slope less than 30 degrees and the rest of the dome should be considered as side walls.

Chapter 7 of civil construction code that details sloping roof is behind an expensively paywall.

Regards

Ashok

[Gerry in Quebec]

Hi Ashok,

This Geodesic Help conversation with Australian engineer Peter Schwazel, dated Feb. 23, 2017, examines snow load on a proposed dome in Western Québec, Canada. It might be of interest to you as it takes into account the slope of each section of the dome.

https://groups.google.com/g/geodesichelp/c/7cHKrCYexgM/m/IfomfOO8DAAJ

Cheers,

- Gerry in Québec

[Ashok Mathur]

Dear Gerry

Thanks for this insight.

I will study and get back to you.

Regards

Ashok

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[Dx G]

There is actually a surprising amount of information on wind and snow loads for domes and shell structures.

One example -
Minimum Design Loads for Buildings and Other Structures. (2013). ASCE/SEI 7-10. American Society of Civil Engineers.
 sect 7.6
Also addresses drifts in later sections, which can be an issue with shell structures that may take loads from one side, especially with windblown wet snow which can accumulate.

 There are others from the research side and industry web site,  even a few dome collapses up in Canada that Gerry might already know all about

examples -

https://www.researchgate.net/figure/Dome-loaded-with-uniform-snow-load-represented-as-concentrated-forces_tbl2_346214302
  has snow load discussion

https://ascelibrary.org/doi/10.1061/9780784416136.ch06
  unbalanced loads and snow drifts

https://www.sciencedirect.com/science/article/abs/pii/S0143974X20309858
Progressive collapse resistance of single-layer latticed domes subjected to non-uniform snow loads

Dx G