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BS EN 1995-1-2:2004

Current

Current

The latest, up-to-date edition.

Eurocode 5. Design of timber structures General - Structural fire design

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

31-08-2009

Foreword
Background of the Eurocode programme
Status and field of application of Eurocodes
National Standards implementing Eurocodes
Links between Eurocodes and harmonised technical
specifications (ENs and ETAs) for products
Additional information specific to EN 1995-1-2
National annex for EN 1995-1-2
Section 1 - General
 1.1 Scope
     1.1.1 Scope of Eurocode 5
     1.1.2 Scope of EN 1995-1-2
 1.2 Normative references
 1.3 Assumptions
 1.4 Distinction between principles and application rules
 1.5 Terms and definitions
 1.6 Symbols
Section 2 - Basis of design
 2.1 Requirements
     2.1.1 Basic requirements
     2.1.2 Nominal fire exposure
     2.1.3 Parametric fire exposure
 2.2 Actions
 2.3 Design values of material properties and resistances
 2.4 Verification methods
     2.4.1 General
     2.4.2 Member analysis
     2.4.3 Analysis of parts of the structure
     2.4.4 Global structural analysis
Section 3 - Material properties
 3.1 General
 3.2 Mechanical properties
 3.3 Thermal properties
 3.4 Charring depth
     3.4.1 General
     3.4.2 Surfaces unprotected throughout the time of
           fire exposure
     3.4.3 Surfaces of beams and columns initially protected
           from fire exposure
           3.4.3.1 General
           3.4.3.2 Charring rates
           3.4.3.3 Start of charring
           3.4.3.4 Failure times of fire protective claddings
 3.5 Adhesives
Section 4 - Design procedures for mechanical resistance
 4.1 General
 4.2 Simplified rules for determining cross-sectional
     properties
     4.2.1 General
     4.2.2 Reduced cross-section method
     4.2.3 Reduced properties method
 4.3 Simplified rules for analysis of structural members
     and components
     4.3.1 General
     4.3.2 Beams
     4.3.3 Columns
     4.3.4 Mechanically jointed members
     4.3.5 Bracings
 4.4 Advanced calculation methods
Section 5 - Design procedures for wall and floor assemblies
 5.1 General
 5.2 Analysis of load-bearing function
 5.3 Analysis of separating function
Section 6 - Connections
 6.1 General
 6.2 Connections with side members of wood
     6.2.1 Simplified rules
           6.2.1.1 Unprotected connections
           6.2.1.2 Protected connections
           6.2.1.3 Additional rules for connections with
                   internal steel plates
     6.2.2 Reduced load method
           6.2.2.1 Unprotected connections
           6.2.2.2 Protected connections
 6.3 Connections with external steel plates
     6.3.1 Unprotected connections
     6.3.2 Protected connections
 6.4 Simplified rules for axially loaded screws
Section 7 - Detailing
 7.1 Walls and floors
     7.1.1 Dimensions and spacings
     7.1.2 Detailing of panel connections
     7.1.3 Insulation
 7.2 Other elements
Annex A (Informative) - Parametric fire exposure
   A1 General
   A2 Charring rates and charring depths
   A3 Mechanical resistance of members in edgewise bending
Annex B (informative) - Advanced calculation methods
   B1 General
   B2 Thermal properties
   B3 Mechanical properties
Annex C (Informative) - Load-bearing floor joists and wall
        studs in assemblies whose cavities completely filled
        with insulation
   C1 General
   C2 Residual cross-section
      C2.1 Charring rates
      C2.2 Start of charring
      C2.3 Failure times of panels
   C3 Reduction of strength and stiffness parameters
Annex D (informative) - Charring of members in wall and floor
        assemblies with void cavities
   D1 General
   D2 Charring rates
   D3 Start of charring
   D4 Failure times of panels
Annex E (informative) - Analysis of the separating function of
        wall and floor assemblies
   E1 General
   E2 Simplified method for the analysis of insulation
      E2.1 General
      E2.2 Basic insulation values
      E2.3 Position coefficients
      E2.4 Effect of joints
Annex F (informative) - Guidance for users of this Eurocode Part

Describes the design of buildings and civil engineering works in timber (solid timber, sawn, planed or in pole form, glued laminated timber or wood-based structural products, e.g. LVL) or wood-based panels jointed together with adhesives or mechanical fasteners.

1.1.1 Scope of Eurocode 5 P Eurocode 5 applies to the design of buildings and civil engineering works in timber (solidtimber, sawn, planed or in pole form, glued laminated timber or wood-based structural products,e.g. LVL) or wood-based panels jointed together with adhesives or mechanical fasteners. It complies with the principles and requirements for the safety and serviceability of structures and the basis of design and verification given in EN 1990:2002. P Eurocode 5 is only concerned with requirements for mechanical resistance, serviceability, durability and fire resistance of timber structures. Other requirements, e.g concerning thermal or sound insulation, are not considered. Eurocode 5 is intended to be used in conjunction with: EN 1990:2002 Eurocode - Basis of structural design” EN 1991 “Actions on structures” EN´s for construction products relevant to timber structures EN 1998 “Design of structures for earthquake resistance”, when timber structures are built in seismic regions. Eurocode 5 is subdivided into various parts: EN 1995-1 General EN 1995-2 Bridges EN 1995-1 “General” comprises: EN 1995-1-1 General – Common rules and rules for buildings EN 1995-1-2 General – Structural Fire Design EN 1995-2 refers to the General rules in EN 1995-1-1. The clauses in EN 1995-2 supplement the clauses in EN 1995-1. 1.1.2 Scope of EN 1995-1-2 P EN 1995-1-2 deals with the design of timber structures for the accidental situation of fire exposure and is intended to be used in conjunction with EN 1995-1-1 and EN 1991-1-2:2002. EN 1995-1-2 only identifies differences from, or supplements normal temperature design. P EN 1995-1-2 deals only with passive methods of fire protection. Active methods are not covered. P EN 1995-1-2 applies to building structures that are required to fulfil certain functions when exposed to fire, in terms of avoiding premature collapse of the structure (load-bearing function) limiting fire spread (flames, hot gases, excessive heat) beyond designated areas (separating function). P EN 1995-1-2 gives principles and application rules for designing structures for specified requirements in respect of the aforementioned functions and levels of performance. P EN 1995-1-2 applies to structures or parts of structures that are within the scope of EN 1995-1-1 and are designed accordingly. P The methods given in EN 1995-1-2 are applicable to all products covered by product standards made reference to in this Part.

Committee
B/525/5
DevelopmentNote
Supersedes DD ENV 1995-1.2. (12/2004) National Annex of this document is also available. See BS EN 1995-1-2 NA. (10/2006) Supersedes BS 5268-4.1(1978) & BS 5268-4.2(1990). (04/2010) Also available as part of BS KIT 209. (08/2010)
DocumentType
Standard
Pages
74
PublisherName
British Standards Institution
Status
Current
Supersedes

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