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BS EN 1991-1-2:2024

$215.11

Eurocode 1. Actions on structures – Actions on structures exposed to fire

Published By Publication Date Number of Pages
BSI 2024 80
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1.1 Scope of EN 1991 1 2 (1) The methods given in this Eurocode are applicable to buildings and civil engineering works, with a fire load related to the building and its occupancy. (2) EN 1991 1 2 deals with thermal and mechanical actions on structures exposed to fire. It is intended to be used in conjunction with the fire design Parts of EN 1992 to EN 1996 and EN 1999 which give rules for designing structures for fire resistance. (3) EN 1991 1 2 contains thermal actions either nominal or physically based. More data and models for physically based thermal actions are given in annexes. (4) EN 1991 1 2 does not cover the assessment of the damage of a structure after a fire. (5) EN 1991 1 2 does not cover supplementary requirements concerning, for example: – the possible installation and maintenance of sprinkler systems; – conditions on occupancy of building or fire compartment; – the use of approved insulation and coating materials, including their maintenance. 1.2 Assumptions (1) In addition to the general assumptions of EN 1990 the following assumptions apply: – any active and passive fire protection systems taken into account in the design will be adequately maintained; – the choice of the relevant design fire scenario is made by appropriate qualified and experienced personnel, or is given by the relevant national regulation.

PDF Catalog

PDF Pages PDF Title
2 undefined
14 1 Scope
1.1 Scope of EN 199112
1.2 Assumptions
2 Normative references
15 3 Terms, definitions and symbols
3.1 Terms and definitions
3.1.1 Common terms used in Eurocode Fire parts
17 3.1.2 Special terms relating to design in general
3.1.3 Terms relating to thermal actions
19 3.1.4 Terms relating to heat transfer analysis
20 3.2 Symbols and abbreviations
3.2.1 Latin upper case letters
22 3.2.2 Latin lower case letters
23 3.2.3 Greek upper case letters
24 3.2.4 Greek lower case letters
25 4 Structural fire design procedure
4.1 General
4.2 Design fire scenario
4.3 Design fire
4.4 Temperature analysis of members
26 4.5 Mechanical analysis of members
27 5 Thermal actions for temperature analysis
5.1 Heat flux
28 5.2 Nominal fire curves
5.2.1 Standard fire curve
5.2.2 External fire curve
5.2.3 Hydrocarbon fire curve
29 5.3 Physically based fire models
5.3.1 Simplified fire models
5.3.1.1 General
5.3.1.2 Compartment fires
5.3.1.3 Localized fires
5.3.2 Advanced fire models
30 6 Mechanical actions for structural analysis
6.1 General
6.2 Simultaneity of actions
6.2.1 Actions from normal temperature design
31 6.2.2 Additional actions
6.3 Combination rules for actions
6.3.1 General rule
6.3.2 Simplified rules
33 6.3.3 Load level
34 Annex A (informative)Parametric fire curves
A.1 Use of this annex
A.2 Scope and field of application
A.3 Fire curves in the heating phase
36 A.4 Fire curves in the cooling phase
37 Annex B (informative)Thermal actions for external members — Simplified calculation method
B.1 Use of this annex
B.2 Scope and field of application
B.3 Conditions of use
38 B.4 Effects of wind
B.4.1 Mode of ventilation
B.4.2 Flame deflection by wind
39 B.5 Characteristics of fire and flames
B.5.1 No forced draught
42 B.5.2 Forced draught
45 B.6 Overall configuration factors
46 Annex C (informative)Localized fires
C.1 Use of this annex
C.2 Scope and field of application
C.3 Virtual solid flame
C.3.1 Shape of the virtual solid flame
47 C.3.2 Temperature of the virtual solid flame
48 C.3.3 Virtual solid flame position and extension
52 C.3.4 Net heat flux
53 Annex D (informative)Advanced fire models
D.1 Use of this annex
D.2 Scope and field of application
D.3 One-zone models
54 D.4 Two-zone models
D.5 Computational fluid dynamics models
55 Annex E (informative)Fire load densities, fire growth rates and rate of heat releases
E.1 Use of this annex
E.2 Scope and field of application
E.3 Design value of fire load density
58 E.4 Determination of fire load densities
E.4.1 General
E.4.2 Definitions
59 E.4.3 Protected fire loads
E.4.4 Net calorific values
61 E.4.5 Fire load classification of occupancies
62 E.4.6 Individual assessment of fire load densities
E.5 Combustion behaviour
E.6 Rate of heat release Q
65 Annex F (informative)Equivalent time of fire exposure
F.1 Use of this annex
F.2 Scope and field of application
F.3 Equivalent time of standard fire exposure
67 Annex G (informative) Configuration factor
G.1 Use of this annex
G.2 Scope and field of application
G.3 General
68 G.4 Shadow effects
G.5 External members
71 G.6 Virtual solid flame
75 Annex H (informative) Thermal actions for structural fire loads of timber structures
H.1 Use of this annex
H.2 Scope and field of application
H.3 General
76 H.4 Structural fire load by the timber members
BS EN 1991-1-2:2024
$215.11