(1)P ENV 1991 provides general principles and actions for the structural design of buildings and civil engineering works including some geotechnical aspects and shall be used in conjunction with ENV 1992-1999.
(2) It may also be used as a basis for the design of structures not covered in ENV 1992-1999 and where other materials or other structural design actions are involved.
(3) ENV 1991 also covers structural design during execution and structural design for temporary structures. It relates to all circumstances in which a structure is required to give adequate performance.
(4) ENV 1991 is not directly intended for the structural appraisal of existing construction, in developing the design of repairs and alterations or, for assessing changes of use.
(5) ENV 1991 does not completely cover special design situations which require unusual reliability considerations such as nuclear structures for which specified design procedures should be used.
1.1.2 Scope of ENV 1991-2-3 Snow loads
(1)P Design guidance is provided for loads imposed by snow which has fallen in calm air and in windy conditions for the structural design of buildings and civil engineering work.
(2)P This Part does not generally apply for sites at altitudes above 1500m .
(3) Annex B may be used in specific regions where all the snow normally melts and clears between individual weather systems and wind speeds are high.
Note: Use of Annex B has to be agreed with the National Competent Authority.
(4) This Part does not give guidance on:
- impact snow loads resulting from snow sliding off or falling from a higher roof;
- loads which could occur if snow and ice block drainage systems;
- the additional wind loads which could result from changes in shape or size of the building structure due to the presence of snow or the accretion of ice;
- loads in areas where snow is present all the year;
- ice loading;
- lateral loading due to snow (e.g. lateral loads exerted by drifts);
- the increase in load due to heavy rain falling on snow.
(5) ENV 1991-2-3 shall be used only in conjunction with ENV 1991-1 and other Parts of ENV 1991.