CEN/TC 250/SC 1/WG 1 - Climatic actions

1.1   Scope of EN 1991-1-3
(1) EN 1991-1-3 gives principles and rules to determine the values of loads due to snow to be used for the structural design of buildings and civil engineering works.
(2) This document does not apply to sites at altitudes above 1 500 m, unless otherwise specified.
NOTE   For rules for the treatment of snow loads for altitudes above 1 500 m, see 6.1.
(3) This document does not give guidance on specialist aspects of snow loading, for example:
-   impact snow loads resulting from snow sliding off or falling from a higher roof;
-   changes in shape or size of the construction works due to the presence of snow or the accretion of ice which could affect the wind action;
-   loads in areas where snow is present all year round;
-   lateral loading due to snow creep (e.g. lateral loads exerted by drifts);
-   loads due to artificial snow.
1.2   Assumptions
The assumptions given in EN 1990:2023, 1.2 apply.

1.1   Scope of EN 1991-1-5
(1) EN 1991-1-5 gives principles and rules for calculating thermal actions on buildings, bridges and other structures including their structural members. Principles needed for cladding and other attachments of buildings are also provided.
(2) This document describes the changes in the temperature of structural members. Characteristic values of thermal actions are presented for use in the design of structures which are exposed to daily and seasonal climatic changes.
(3) This document also gives principles for changes in the temperature of structural members due to the paving of hot asphalt on bridge decks.
(4) This document also provides principles and rules for thermal actions acting in structures which are mainly a function of their use (e.g. cooling towers, silos, tanks, warm and cold storage facilities, hot and cold services, etc.).
NOTE   Supplementary guidance for thermal actions on chimneys is provided in EN 13084-1.
1.2   Assumptions
(1) The assumptions given in EN 1990:2023, 1.2 apply.
(2) EN 1991 1 5 is intended to be used with EN 1990, the other parts of EN 1991 and EN 1992 (all parts) to EN 1999 (all parts) for the design of structures.

(1) This document gives rules for the determination of natural wind actions for the structural design of building and civil engineering works for each of the loaded areas under consideration. This includes actions applied to the whole structure or parts of it, as well as wind-exposed elements attached to the structure.
(2) This document is applicable to:
— buildings and other civil engineering works with heights up to 200 m;
— guyed masts, other open lattice structures and chimneys with heights up to 300 m;
— bridges having no span greater than 200 m.
(3) The rules contained in this document allow the evaluation of characteristic wind actions on land based
structures.
(4) This document is applicable to offshore coastal structures.
NOTE Additional or amended provisions can be necessary.
(5) This document does not give guidance on non-synoptic winds (e.g. thunderstorms, downbursts, microbursts, tornadoes, etc.), mixed wind climates, nor does it give guidance on how to account for local effects (e.g. thermal effects, funnelling, strong arctic thermal surface inversion, etc.).
(6) This document addresses simplified procedures for dynamic effects, mostly based on the assumption of a dominant single-mode response (see Annex E, Annex F and Annex G). General criteria for performing a full dynamic analysis under aerodynamic excitation are not treated in this document.
(7) Wind pressure effects of passing vehicles are outside the scope of this document.
NOTE See EN 1991-2 for wind effects from passing trains.
8) This document also provides guidance on wind tunnel testing and numerical modelling which can be needed or desirable when the shape or structural behaviour are unusual or do not strictly fall within the rules of the document, or in cases of unusual orography or other surroundings.