In the Loadcase dialog when a snow, snow drift, or ice loadcase is selected, the default values of Ψ 0, Ψ 1 and Ψ 2 are displayed. It is based on Eurocode 1: Actions on Structures Part 1-3; General Actions – Snow Loads. The flat roof snow load is calculated using formula 7.3-1: Annex B - Normative - Snow load shape coefficients for exceptional snow drift. The Snow/Wind Loads dialog has the following 4 tabs: ----- EN1991-1-3_(b).zip (Exc el 32-64 bit) Annex A - Normative - Design situations and load arrangements to be used for different locations. Name of Legally Binding Document: BS NA EN 1991-1-3: UK National Annex to Eurocode 1. For flat roofs, 0° - a (with no higher structures close or abutting), P1 - P2 - 0.8 Actions on structures. After defining general structure parameters necessary to generate snow/wind loads (envelope, spacing, and depth) for the snow/wind code - Eurocode 1 (EN 1991-1-3:2003 - wind and EN 1991-1-4:2005 - snow and several codes for individual European countries), you must also specify the parameters for the snow and wind loads.. In persistent or transient situations, snow load on a roof, s, is defined as being:
Sk -where snow load shape factor p1 - undrifted snow shape factor p2 - drifted snow shape factor. Sec. Sec. Sec. Snow loads Name of Standards Organization: British Standards Institution (BSI) LEGALLY BINDING DOCUMENT These vary depending on the National Annex being worked to. 1-3: Snow loads 1-4: Wind actions 1-5: Thermal actions 1-6: Actions during execution 1-7: Accidental actions This guide is essential reading for: civil and structural engineers code-drafting committees clients structural-design students public authorities product manufacturers in fact, everyone who will be affected by the Eurocodes. Other considerations for sloped roofs can be found throughout Chapter 7 of ASCE 7-10. 6.4 Snow loads on snowguards and other obstacles. The values can be edited if required. In our case, let’s assume that our structure has a flat roof (roof slope ≤ 5°). David Brown, SCI Deputy Director, explains the Eurocode system. Snow and snow drift loads (Eurocode) Definition of psi factors for snow and snow drift load cases. Source: Designers' Guide to Eurocode 1: Actions on Buildings, 1 Jan 2009 (19–27) Chapter 4 Snow load on the ground Source: Designers' Guide to Eurocode 1: Actions on Buildings … With this Eurocode being focused on an action that is sensitive to environmental effects, the UK annex to it plays a significant role, as it makes reference to projected snow falls that are unique to the British Isles. As an integral part of the National Annexes for the application of Eurocode 1, Parts 1-3, 1-4 and 1-5, it is necessary to develop snow load, wind and temperature maps, and for the application of Eurocode 8, part 1, the map of earthquake areas in Bosnia and Herzegovina. In the language of the Eurocodes, ‘dead loads’ become ‘permanent actions’, imposed loads, snow loads and wind loads are collectively called ‘variable actions’ and ‘load combinations’ becomes ‘combinations of actions’. Eurocode 1: Actions on structures -Part 1-4: General actions - ... 7.1.3 Effects of ice and snow 7.2 Pressure coefficients for buildings 7.2.1 General 7.2.2 Vertical walls of rectangular plan buildings 7.2.3 Flat roofs ... B.3 Number of loads for dynamic response 105 The snow load that is applied to our structure is not the ground snow load, but in most cases, the flat roof snow load. General actions. 6.3 Snow overhanging the edge of a roof. 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