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Snow loading (BS6399): Why is the site snow load reduced for altitudes < 100m?

Tekla Tedds Snow loading BS 6399 site reduced altitude altitudes 100m less then more then one hundred meters
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British Standard

BS6399-3 cl 6.2 states "Note: for simplicity the calculation it is assumed that the same value for the basic snow load on the ground should apply for altitudes between 0-100m. If preferred the equation for altitudes greater than 100m may be used for altitudes between 0-100m; in these cases the correction term; S_alt (A-100)/100 will automatically be negative."

i.e. You should increase the basic snow load for altitudes >100m but for altitudes < 100m you can either  use the default s_b value or opt to use the formula to reduce the site snow load.

Tedds implements the latter option and use the correction term for all altitudes.

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