1、BS EN 14250:2010ICS 91.080.20NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDTimber structures Product requirementsfor prefabricatedstructural membersassembled withpunched metal platefastenersThis British Standardwas published under theauthority of the Standards
2、Policy and StrategyCommittee on 30 April2010 BSI 2010ISBN 978 0 580 57300 2Amendments/corrigenda issued since publicationDate CommentsBS EN 14250:2010National forewordThis British Standard is the UK implementation of EN 14250:2010. Itsupersedes BS EN 14250:2004 which is withdrawn.The UK participatio
3、n in its preparation was entrusted to TechnicalCommittee B/518, Structural timber.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are responsible for its cor
4、rect application.Compliance with a British Standard cannot confer immunityfrom legal obligations.BS EN 14250:2010EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 14250 January 2010 ICS 91.080.20 Supersedes EN 14250:2004English Version Timber structures - Product requirements for prefabricated st
5、ructural members assembled with punched metal plate fasteners Structure en bois - Exigences de produit relatives aux lments de structures prfabriqus utilisant des connecteurs plaque mtallique emboutie Holzbauwerke - Produktanforderungen an vorgefertigte tragende Bauteile mit Nagelplattenverbindungen
6、 This European Standard was approved by CEN on 3 December 2009. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical re
7、ferences concerning such national standards may be obtained on application to the CEN Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN memb
8、er into its own language and notified to the CEN Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland
9、, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17,
10、B-1000 Brussels 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 14250:2010: EBS EN 14250:2010EN 14250:2010 (E) 2 Contents Page Foreword 31 Scope 42 Normative references 43 Terms and definitions .54 Material requirements .64.1
11、Timber .64.2 Punched metal plate fasteners .75 Prefabricated member requirements .85.1 Mechanical resistance .85.2 Reaction to fire .95.3 Fire resistance 95.4 Other member characteristics 96 Product documents 116.1 General . 116.2 Drawings and structural design information . 117 Evaluation of confor
12、mity 127.1 General . 127.2 Initial type testing . 127.3 Factory production control (FPC) . 147.4 Initial inspection of the factory and of the factory production control . 177.5 Continuous surveillance, assessment and acceptance of the factory production control 178 Marking 18Annex A (normative) Addi
13、tional requirements for factory production control (FPC) . 19A.1 Method 1 19A.2 Method 2 19A.3 Method 3a 19A.4 Method 3b 20Annex ZA (informative) Clauses of this European standard addressing the provisions of the EU Constructions Products Directive . 21ZA.1 Scope and relevant characteristics 21ZA.2
14、Procedure for attestation of conformity of prefabricated structural timber members assembled with punched metal plate fasteners 23ZA.3 CE marking and labelling . 25Bibliography . 32BS EN 14250:2010EN 14250:2010 (E) 3 Foreword This document (EN 14250:2010) has been prepared by Technical Committee CEN
15、/TC 124 “Timber structures”, the secretariat of which is held by SFS. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by July 2010, and conflicting national standards shall be withdrawn at the latest
16、 by July 2010. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 14250:2004. This document has been prepared
17、 under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s). For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document. According to the CEN/CENELEC Internal
18、 Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembour
19、g, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 14250:2010EN 14250:2010 (E) 4 1 Scope This European Standard specifies material, product and documentation requirements for prefabricated structural members (e.g. tr
20、usses for roofs, walls and floors, frames, composite beams and girders) for use in buildings made from solid structural timber according to EN 14081-1 with or without finger joints assembled with punched metal plate fasteners. This document is valid for trusses with lengths up to 35 m and for other
21、prefabricated structural members with spans up to 12 m. The standard also covers tests and/or calculation methods to carry out the evaluation of conformity, requirements for the marking of these members, and external conditions (service class 3 in accordance with EN 1995-1-1 or use classes 3, 4 and
22、5 in accordance with EN 335-1). As regards resistance to biological organisms, this standard covers prefabricated structural members manufactured from either untreated timber or timber treated to improve its natural durability. This standard does not cover prefabricated timber structural members int
23、ended to be used in constructions under predominantly dynamic loads (e.g. bridges) or for use in unprotected external conditions (i.e. use class 3 in accordance with EN 335-1). Furthermore, it does not cover members treated to improve their fire performance. 2 Normative references The following refe
24、renced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 335-1, Durability of wood and wood-based products Definition of
25、use classes Part 1: General EN 335-2, Durability of wood and wood-based products Definition of use classes Part 2: Application to solid wood EN 336:2003, Structural timber Sizes, permitted deviations EN 350-2, Durability of wood and wood-based products Natural durability of solid wood Part 2: Guide
26、to natural durability and treatability of selected wood species of importance in Europe EN 844-3, Round and sawn timber Terminology Part 3: General terms relating to sawn timber EN 844-9:1997, Round and sawn timber Terminology Part 9: Terms relating to features of sawn timber EN 1310, Round and sawn
27、 timber Method of measurement of features EN 1990, Eurocode Basis of structural design EN 1991 (all parts), Eurocode 1 Actions on structures EN 1995-1-1, Eurocode 5: Design of timber structures Part 1-1: General Common rules and rules for buildings EN 1995-1-2, Eurocode 5: Design of timber structure
28、s Part 1-2: General Structural fire design EN 13183-2, Moisture content of a piece of sawn timber Part 2: Estimation by electrical resistance method BS EN 14250:2010EN 14250:2010 (E) 5 EN 13501-1, Fire classification of construction products and building elements Part 1: Classification using data fr
29、om reaction to fire tests EN 13501-2, Fire classification of construction products and building elements Part 2: Classification using data from fire resistance tests, excluding ventilation services EN 13823, Reaction to fire tests for building products Building products excluding floorings exposed t
30、o the thermal attack by a single burning item EN 14081-1, Timber structures Strength graded structural timber with rectangular cross section Part 1: General requirements EN 14545, Timber structures Connectors Requirements EN 15228, Structural timber Structural timber preservative treated against bio
31、logical attack prEN 15497, Finger jointed structural timber Performance requirements and minimum production requirements EN ISO 9001:2008, Quality management systems Requirements (ISO 9001:2008) 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1
32、 anchorage area surface area of timber occupied by the plate projections in any particular member 3.2 batch all the structural members produced according to the same specifications in one shift 3.3 dead knot knot that on the considered surface is intergrown with the surrounding wood for less than on
33、e quarter of the cross-sectional perimeter, as defined in EN 844-9:1997 3.4 effective thickness/width actual thickness/width as defined in EN 336:2003 minus any wane present on the edge being considered 3.5 internal bracing element to prevent lateral buckling of a compression member 3.6 live knot in
34、tergrown knot knot that on the considered surface is intergrown with the surrounding wood for more than three quarters of the cross-sectional perimeter as defined in EN 844-9:1997 3.7 plate projection plate tooth, plate nail or burst used for the purpose of transferring forces between members BS EN
35、14250:2010EN 14250:2010 (E) 6 3.8 punched metal plate fastener metal plate having integral projections punched out in one direction perpendicular to the base of the plate, being used to join two or more pieces of timber of the same thickness in the same plane 4 Material requirements 4.1 Timber 4.1.1
36、 Structural timber The following requirements shall apply: a) Structural timber shall be strength graded using grading standards and methods complying with EN 14081-1. b) In addition to the specified grade requirements, structural timber shall also meet the following criteria for geometrical defects
37、, i.e. spring, bow, twist and cup as defined in EN 844-3 and measured in accordance with EN 1310: 1) spring: 4 mm maximum per 2 m length; 2) bow: 6 mm maximum per 2 m length; 3) twist: 2 mm maximum per 25 mm width per 2 m length; 4) cup: 2 mm maximum per 100 mm of face. 4.1.2 Finger jointed timber F
38、inger jointed timber shall meet the requirements of prEN 15497. 4.1.3 Dimensional stability Timber complying with EN 14081-1 shall be deemed to satisfy requirements for performance of this characteristic. In addition preventive structural measures suitable for the protection from biological infestat
39、ion with fungi and insects should be taken into account. NOTE Dimensional stability of the member is given as the swelling and shrinkage of timber due to changes of its moisture content in perpendicular to grain and parallel to grain direction. 4.1.4 Reaction to fire The class of reaction to fire pe
40、rformance of the structural timber used for the prefabricated member (including the additional classification on smoke production and flaming droplets/particles, if any) shall be determined and declared according to EN 13501-1: a) either without the need for further testing (CWFT), as given in Table
41、 11), if the timber is proved to meet the requirements of the class given therein for timber without preservative treatment as well as for preservative treated timber when the preservative treatment does not result, when dry, in an addition in the analytical zone of the treated timber of more than 2
42、 % by mass of organic material; or 1) This table is the same as given in the Decision of the Commission 2003/43/EC of 2003-01-17 (see OJEU L 13 of 2003-01-18), as amended firstly by 2003/593/EC of 2003-08-07 (see OJEU L 201 of 2003-08-08), secondly by 2006/673/EC of 2006-10-05 (see OJEU L 276 of 200
43、6-10-07) and thirdly by 2007/348/EC of 2007-05-15 (see OJEU L 131 of 2007-05-23), and corrected by the Corrigendum (see OJEU L 33 of 2003-02-08). BS EN 14250:2010EN 14250:2010 (E) 7 b) based on testing of the timber according to the standards referred to in EN 13501-1, when the timber does not meet
44、the requirements of Table 1 or where a higher classification than the one in a) is sought. When option b) is applied and where required by the test method, the structural member shall be mounted and fixed in a manner representative of its intended end use. When tested according to EN 13823, the timb
45、er shall be mounted in accordance with the following: c) the whole area of both wings in the SBI apparatus shall be covered with timber pieces mounted edge to edge (butt jointed), without jointing or bonding and orientated horizontally or vertically, supported by d) timber battens, minimum 40 mm 40
46、mm, fixed to the test backing boards at 400 mm to 600 mm centres horizontally or vertically (perpendicular to the orientation of the timber pieces). Table 1 Structural timber considered as classified without the need for further testing (CWFT) Producta Product details Minimum mean densityc kg/m3Mini
47、mum overall thickness mm Classb (excluding floorings)Structural timber Visual and machine graded structural timber with rectangular cross-sections shaped by sawing, planning or other methods 350 22 D-s2, d0 aApplies to all species covered by the product standards. bClass as provided for in Table 1 o
48、f the Annex to Decision 2000/147/EC. cConditioned according to EN 13238. 4.1.5 Resistance to biological organisms 4.1.5.1 Timber without preservative treatment The timber shall have adequate natural durability in accordance with EN 350-2 for the intended use class as defined in EN 335-1 and EN 335-2
49、 and the durability class shall be declared. 4.1.5.2 Timber with preservative treatment If preservative treated timber is used, the durability class, type of preservative, critical retention value and penetration class in accordance with EN 15228 shall be declared. 4.2 Punched metal plate fasteners The fasteners used for prefabricated timber structural members shall comply with EN 14545. In add
