Amendments/corrigenda issued since publication

Committees responsible for this National Annex

The preparation of this National Annex was entrusted by Technical Committee B/525, Building and civil engineering structures, to Subcommittee B/525/1, Actions (loadings) and basis of design, upon which the following bodies were represented:

Association of Consulting Engineers
British Constructional Steelwork Association
British Masonry Society
Building Research Establishment
Concrete Society
Health and Safety Executive
Highways Agency
Institution of Civil Engineers
Institution of Structural Engineers
National House Building Council
Office of the Deputy Prime Minister
Steel Construction Institute

Introduction

This National Annex has been prepared by BSI Subcommittee B/525/1, Actions (loadings) and basis of design. In the UK it is to be used in conjunction with BS EN 1991‑1‑3:2003+A1:2015.

The start and finish of text introduced or altered by National Amendment No.1 (and No. 2, respectively) are indicated in the text by tags (and ). Minor editorial changes are not tagged.

National Amendment No.1 was made to reflect CEN amendment A1 to BS EN 1991‑1‑3:2003.

NA.1 Scope

This National Annex gives:

the UK decisions for the Nationally Determined Parameters described in the following subclauses of BS EN 1991‑1‑3:2003+A1:2015:

—	1.1 (2)	—	4.2 (1)	—	5.3.4 (3)
—	1.1 (3)	—	4.3 (1)	—	5.3.5 (1)
—	1.1 (4)	—	5.2 (2)	—	5.3.5 (3)
—	2 (3)	—	5.2 (5)	—	5.3.6 (1)
—	2 (4)	—	5.2 (6)	—	5.3.6 (3)
—	3.3 (1)	—	5.2 (7)	—	6.2 (2)
—	3.3 (3)	—	5.2 (8)	—	6.3 (1)
—	4.1 (1)	—	5.3.2 (3)	—	6.3 (2)
—	4.1 (2)	—	5.3.3 (4)	—	Annex A (1)

the UK decisions on the status of BS EN 1991‑1‑3:2003+A1:2015 informative annexes;
references to non-contradictory complementary information.

NA.2 Nationally Determined Parameters

NA.2.1 Altitudes greater than 1 500 m [BS EN 1991‑1‑3:2003+A1:2015, 1.1 (2)]

NA.2.2 Design situations and load arrangements to be used for different locations [BS EN 1991‑1‑3:2003+A1:2015, 1.1 (3)]

NA.2.3 Snow load shape coefficients for exceptional snow drifts [BS EN 1991‑1‑3:2003+A1:2015, 1.1 (4)]

NA.2.4 Exceptional snow load on the ground [BS EN 1991‑1‑3:2003+A1:2015, 2 (3)]

NA.2.5 Load due to exceptional snow drift [BS EN 1991‑1‑3:2003+A1:2015, 2 (4)]

NA.2.6 Locations with exceptional snow load on the ground but with no load due to exceptional snow drift [BS EN 1991‑1‑3:2003+A1:2015, 3.3 (1)]

NA.2.7 Locations with no exceptional snow load on the ground but with load due to exceptional snow drift [BS EN 1991‑1‑3:2003+A1:2015, 3.3 (2)]

NA.2.8 Locations with exceptional snow load on the ground and with load due to exceptional snow drift [BS EN 1991‑1‑3:2003+A1:2015, 3.3 (3)]

NA.2.9 Characteristic value of snow load on the ground [BS EN 1991‑1‑3:2003+A1:2015, 4.1 (1)]

NA.2.10 Refined characteristic value of snow load on to the ground [BS EN 1991‑1‑3:2003+A1:2015, 4.1 (2)]

NA.2.11 Other representative values for snow load on the ground [BS EN 1991‑1‑3:2003+A1:2015, 4.2 (1)]

NA.2.12 Treatment of exceptional snow load on the ground [BS EN 1991‑1‑3:2003+A1:2015, 4.3 (1)]

NA.2.13 Determining load arrangements for snow loads on roofs [BS EN 1991‑1‑3:2003+A1:2015, 5.2 (2)]

NA.2.14 Load arrangements for artificial removal or redistribution of snow on a roof [BS EN 1991‑1‑3:2003+A1:2015, 5.2 (5)]

NA.2.15 Load arrangements for situations arising from rainfall on snow on roofs [BS EN 1991‑1‑3:2003+A1:2015, 5.2 (6)]

NA.2.16 Exposure coefficient used for determining snow load on a roof [BS EN 1991‑1‑3:2003+A1:2015, 5.2 (7)]

NA.2.17 Thermal coefficient used to account for the reduction of snow load on roofs with high thermal transmittance [BS EN 1991‑1‑3:2003+A1:2015, 5.2 (8)]

NA.2.18 Monopitch roofs [BS EN 1991‑1‑3:2003+A1:2015, 5.3.2(3)]

NA.2.19 Drifted snow load arrangements for pitched roofs [BS EN 1991‑1‑3:2003+A1:2016, 5.3.3 (4)]

NA.2.20 Drifted snow load arrangement for multi-span roofs [BS EN 1991‑1‑3:2003+A1:2015, 5.3.4 (3)]

NA.2.21 Snow load shape coefficient for cylindrical roofs [BS EN 1991‑1‑3:2003+A1:2015, 5.3.5 (1)]

NA.2.22 Drifted snow load arrangement for cylindrical roofs [BS EN 1991‑1‑3:2003+A1:2015, 5.3.5 (3)]

NA.2.23 Snow load shape coefficient for a roof abutting and close to taller construction works [BS EN 1991‑1‑3:2003+A1:2015, 5.3.6 (1)]

NA.2.24 Drifted snow load arrangement for a roof abutting and close to taller construction works [BS EN 1991‑1‑3:2003+A1:2015, 5.3.6 (3)]

NA.2.25 Drifting at projections and obstructions [BS EN 1991‑1:2003+A1:2015, 6.2 (2)]

NA.2.26 Altitude at which to consider the effects of snow overhanging the edge of a roof [BS EN 1991‑1‑3:2003+A1:2015, 6.3 (1)]

NA.2.27 Calculating the loads caused by snow overhanging the edge of a roof [BS EN 1991‑1‑3:2003+A1:2015, 6.3 (2)]

NA.2.28 Design situations and load arrangements to be used for different locations [BS EN 1991‑1‑3:2003+A1:2015, Annex A]

NA.3 Decisions on the status of informative annexes

NA.3.1 Snow load shape coefficients for exceptional snow drifts [BS EN 199113:2003+A1:2015, Annex B]

NA.3.2 European ground snow load maps [BS EN 1991‑1‑3:2003+A1:2015, Annex C]

NA.3.3 Adjustment of the ground snow load according to return period [BS EN 1991‑1‑3:2003+A1:2015, Annex D]

NA.3.4 Bulk weight density of snow [BS EN 1991‑1‑3:2003+A1:2015, Annex E]

NA.4 References to non-contradictory complementary information

NA.4.1 Specialist aspects of snow loading [BS EN 1991‑1‑3:2003+A1:2015, 1.1 (8)]

NA.4.2 Snow load shape coefficients for exceptional snow loads

NA.4.3 Snow load shape coefficients for roofs intersecting at right angles

Bibliography

NA+A2:18 to BS EN 1991-1-3:2003+A1:2015

UK National Annex to Eurocode 1: Actions on structures - General actions. Snow loads

Current

Published:

31 Oct 2018