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’. Other considerations for sloped roofs can be found throughout Chapter 7 of ASCE 7-10. 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 our case, let’s assume that our structure has a flat roof (roof slope ≤ 5°). The Snow/Wind Loads dialog has the following 4 tabs: 6.3 Snow overhanging the edge of a roof. Sec. Sec. Snow and snow drift loads (Eurocode) Definition of psi factors for snow and snow drift load cases. Actions on structures. The snow load that is applied to our structure is not the ground snow load, but in most cases, the flat roof snow load. The flat roof snow load is calculated using formula 7.3-1: General actions. Annex B - Normative - Snow load shape coefficients for exceptional snow drift. 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. Name of Legally Binding Document: BS NA EN 1991-1-3: UK National Annex to Eurocode 1. The values can be edited if required. 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. It is based on Eurocode 1: Actions on Structures Part 1-3; General Actions – Snow Loads. 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. For flat roofs, 0° - a (with no higher structures close or abutting), P1 - P2 - 0.8 These vary depending on the National Annex being worked to. 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 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. 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