SIST EN 14250:2010
(Main)Timber structures - Product requirements for prefabricated structural members assembled with punched metal plate fasteners
Timber structures - Product requirements for prefabricated structural members assembled with punched metal plate fasteners
This European Standard specifies material, product and documentation requirements for prefabricated structural members (e.g. trusses 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 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 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 intended 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.
Holzbauwerke - Produktanforderungen an vorgefertigte tragende Bauteile mit Nagelplattenverbindungen
Dieses Dokument legt Produktanforderungen an vorgefertigte tragende Bauteile (z. B. Fachwerkträger für Dächer, Wände und Decken sowie Rahmen, Verbundbalken und Träger), die aus Bauteilen aus Bauholz für tragende Zwecke (mit oder ohne Keilzinkenverbindungen) unter Verwendung von Nagelplatten gefertigt werden und die für die Verwendung in Gebäuden bestimmt sind, fest.
Diese Bauteile sind nicht für die Verwendung unter vorwiegend dynamischen Belastungen wie z.B. für Brücken oder unter ungeschützten Bedingungen im Freien vorgesehen.
Diese Norm enthält auch Verfahren zur Ausführung der Konformitätsbeurteilung und Kennzeichnung.
Sie umfasst vorgefertigte tragende Bauteile aus Bauholz mit oder ohne Behandlung gegen biologischen Befall.
Structure en bois - Exigences de produit relatives aux éléments de structures préfabriqués utilisant des connecteurs a plaque métallique emboutie
La présente norme spécifie les exigences de matériau, de produit et de documentation relatives aux éléments
de structure préfabriqués (par exemple, fermes pour toits, murs et planchers, cadres, poutres et poutrelles
composites) destinés à être utilisés dans des bâtiments fabriqués à partir d’éléments en bois de structure
conformément à l’EN 14081-1 avec ou sans aboutages à entures multiples, assemblés au moyen de
connecteurs à plaque métallique emboutie.
Ce document est valable pour les fermes de longueur jusqu’à 35 m et pour d’autres éléments préfabriqués de
structure avec des portées jusqu’à 12m.
Cette norme traite également des méthodes d’essai et/ou de calcul servant à l’évaluation de la conformité,
des exigences pour le marquage de ces éléments, et des conditions extérieures (classe de service 3 selon
EN 1995-1-1 ou classes d’emploi 3,4 et 5 selon EN 335-1).
En ce qui concerne la résistance vis à vis des organismes biologiques, la présente norme traite des éléments
de structure préfabriqués soit à partir de bois non traité, soit à partir de bois traité afin d’améliorer sa durabilité
naturelle.
La présente norme ne traite pas des éléments de structure préfabriqués en bois destinés à être utilisés dans
des constructions soumises de manière prédominante à des charges dynamiques (par exemple des ponts) ou
pour une utilisation dans des conditions extérieures non protégées (c’est à dire classe d’emploi 3 selon l’EN
335-1).
De plus, la norme ne couvre pas les éléments traités afin d’améliorer leur performance au feu.
Lesene konstrukcije - Zahteve za proizvodnjo predhodno izdelanih konstrukcijskih elementov s kovinskimi ježastimi ploščami
Ta evropski standard določa zahteve glede materiala, proizvodov in dokumentacije za proizvodnjo predhodno izdelanih konstrukcijskih elementov (npr. nosilnih tramovov za strehe, stene in tla, okvirjev, sestavljenih gredi in tramov) za uporabo v stavbah, ki so izdelani iz trdnega konstrukcijskega lesa v skladu z EN 14081-1 z ali brez spojev z zobci, s kovinskimi ježastimi ploščami. Ta dokument se uporablja za nosilne tramove dolžin do 35 m in za druge predhodno izdelane konstrukcijske elemente z razponi do 12 m. Standard zajema tudi metode za preskušanje in/ali izračun za izvedbo ocene skladnosti, zahteve za označevanje teh elementov in zunanje pogoje (razred storitve 3 v skladu z EN 1995-1-1 ali razredi uporabe 3, 4 in 5 v skladu z EN 335-1). Glede odpornosti proti biološkim organizmom ta standard zajema predhodno izdelane konstrukcijske elemente iz bodisi neobdelanega lesa ali lesa, ki je obdelan zaradi izboljšanja njegove naravne trajnosti. Ta standard ne zajema predhodno izdelanih lesenih konstrukcijskih elementov, namenjenih za uporabo pri konstrukcijah pod pretežno dinamičnimi obtežbami (tj. mostovih) ali za uporabo v nezaščitenih zunanjih pogojih (tj. razred uporabe 3 v skladu z EN 335-1). Poleg tega ne zajema elementov, ki so obdelani zaradi izboljšanja njihove požarne odpornosti.
General Information
Relations
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.NRQVWUXNFLMVNLKHolzbauwerke - Produktanforderungen an vorgefertigte tragende Bauteile mit NagelplattenverbindungenStructure en bois - Exigences de produit relatives aux éléments de structures préfabriqués utilisant des connecteurs a plaque métallique emboutieTimber structures - Product requirements for prefabricated structural members assembled with punched metal plate fasteners91.080.20Lesene konstrukcijeTimber structuresICS:Ta slovenski standard je istoveten z:EN 14250:2010SIST EN 14250:2010en,fr01-maj-2010SIST EN 14250:2010SLOVENSKI
STANDARDSIST EN 14250:20051DGRPHãþD
SIST EN 14250:2010
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 14250
January 2010 ICS 91.080.20 Supersedes EN 14250:2004English Version
Timber structures - Product requirements for prefabricated structural members assembled with punched metal plate fasteners
Structure en bois - Exigences de produit relatives aux éléments de structures préfabriqués utilisant des connecteurs à plaque métallique emboutie
Holzbauwerke - Produktanforderungen an vorgefertigte tragende Bauteile mit Nagelplattenverbindungen 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 references 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 member 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, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,
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: ESIST EN 14250:2010
EN 14250:2010 (E) 2 Contents Page Foreword .31Scope .42Normative references .43Terms and definitions .54Material requirements .64.1Timber .64.2Punched metal plate fasteners .75Prefabricated member requirements .85.1Mechanical resistance .85.2Reaction to fire .95.3Fire resistance .95.4Other member characteristics .96Product documents . 116.1General . 116.2Drawings and structural design information . 117Evaluation of conformity . 127.1General . 127.2Initial type testing . 127.3Factory production control (FPC) . 147.4Initial inspection of the factory and of the factory production control . 177.5Continuous surveillance, assessment and acceptance of the factory production control . 178Marking . 18Annex A (normative)
Additional requirements for factory production control (FPC) . 19A.1Method 1 . 19A.2Method 2 . 19A.3Method 3a . 19A.4Method 3b . 20Annex ZA (informative)
Clauses of this European standard addressing the provisions of the EU Constructions Products Directive . 21ZA.1Scope and relevant characteristics . 21ZA.2Procedure for attestation of conformity of prefabricated structural timber members assembled with punched metal plate fasteners . 23ZA.3CE marking and labelling . 25Bibliography . 32 SIST EN 14250:2010
EN 14250:2010 (E) 3 Foreword This document (EN 14250:2010) has been prepared by Technical Committee CEN/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 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 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 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, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. SIST EN 14250:2010
EN 14250:2010 (E) 4 1 Scope This European Standard specifies material, product and documentation requirements for prefabricated structural members (e.g. trusses 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 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 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 intended 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 referenced 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 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 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 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 structures — 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 SIST EN 14250:2010
EN 14250:2010 (E) 5 EN 13501-1, Fire classification of construction products and building elements — Part 1: Classification using data from 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 to 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 biological 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 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 one 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
intergrown 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 SIST EN 14250:2010
EN 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 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, 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 Finger 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 infestation 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 performance 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 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 % 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 2006-10-07) 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). SIST EN 14250:2010
EN 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 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 timber 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 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/m3 Minimum 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 a Applies to all species covered by the product standards. b Class as provided for in Table 1 of the Annex to Decision 2000/147/EC. c Conditioned 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 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 addition, if the timber is preservative treated against biological organisms, the fasteners treatment against corrosion shall be compatible with the preservative used. NOTE When timber is treated with substances which cause corrosion (e.g. copper salts or organic substances) connectors made of austenitic stainless steel or galvanized (Z275 or Z350) can be used in use classes 1 and 2. SIST EN 14250:2010
EN 14250:2010 (E) 8 5 Prefabricated member requirements 5.1 Mechanical resistance 5.1.1 General The mechanical resistance shall be determined and declared in terms of:
load-bearing capacity; and
stiffness (declared normally as deflection for a specified load/unit load). Influence of preservative treatment on mechanical resistance shall be assessed according to EN 15228. 5.1.2 Determination and declaration The mechanical resistance (i.e. load-bearing capacity and stiffness) of the prefabricated structural member shall be determined and declared according to one of the following methods: a) Method 1: By reference to dated drawings of the structural member with information on the geometrical data and reference to the material properties of the structural components and punched metal plate fasteners used, necessary to calculate characteristic load-bearing capacities and stiffness according to method(s) valid in the Member State of the intended use of this structural member. NOTE 1 This method is assumed to reflect Method 1 in Guidance Paper L. By this method the characteristic mechanical resistance is indirectly declared. It may be relevant for a structural member manufactured according to the manufacturer's specification and put on the market, e.g. on the retailer shelves, without necessarily knowing the works where the member is going to be used. b) Method 2: Directly, by calculating the characteristic values or design values for the load-bearing capacities and stiffness of the structural member according to the method(s) given in EN 1995-1-1 with possibly reference to the used sets of National Determined Parameters (NDPs), if any, valid in the Member State of the intended use of the structural member. NOTE 2 This method is assumed to reflect Method 2 in Guidance Paper L. By this method the characteristic mechanical resistance is directly declared. It may be relevant for a structural member manufactured according to the manufacturer's specification and put on the market without necessarily knowing the works where the member is going to be used, e.g. for catalogue products, like trussed beams. c) Method 3a: By declaring compliance with the given production documents of the structural member, together with the information on the purchaser and the party responsible for the structural design of the member.
NOTE 3 This method is assumed to reflect Method 3a in Guidance Paper L. By this method the characteristic mechanical resistance is indirectly declared. It may be relevant for a structural member made to measure according to the purchaser’s order. d) Method 3b: By declaring compliance with a given structural design specification of the structural member produced and held by the manufacturer showing that the member is able to resist all the relevant actions affecting it in the ultimate limit state and satisfies specified serviceability requirements in a specific part of works. Structural design specification of the member is based on information (e.g. actions and deflection limits) from a specific part of works according to the design requirements in the Member State of its intended use (EN 1990, EN 1991 and EN 1995-1-1), with possibly reference to the relevant National Annexes defining the National Determined Parameters/method(s) valid in the Member State of the intended use of the structural member. NOTE 4 This method is assumed to reflect Method 3b in Guidance Paper L. By this method the characteristic mechanical resistance is indirectly declared. It may be relevant for a structural member made to measure according to the structural design specification prepared by the manufacturer when the works where the member will be used is known. SIST EN 14250:2010
EN 14250:2010 (E) 9 5.2 Reaction to fire Reaction to fire performance shall be as those of the material (timber) according to 4.1.4. NOTE It is assumed that metal plate fasteners do not influence the reaction to fire performance of the assembled component. 5.3 Fire resistance Where required, the fire resistance performance shall be declared according to EN 13501-2, after being:
a) tested in end-use condition in accordance with test standards given in EN 13501-2; or b) calculated according to EN 1995-1-1 and EN 1995-1-2. 5.4 Other member characteristics 5.4.1 Timber sizes and tolerances Size tolerances of the structural member shall as a minimum be in accordance with tolerance class 2 given in EN 336:2003. Timber sizes shall be not less than:
thickness (width), all members: 35 mm;
depth, external (chord) members: 68 mm;
depth, internal (web or diagonal) members: 58 mm. The effective thickness, as defined in 3.4, of the outer face of any chord member shall not be less than 35 mm. Any damage due to handling of the structural member shall be prevented:
either by applying EN 1995-1-1; or
by using the following minimum thickness requirement "b", in millimetres (mm), for the members:
kmflb,²8,1= where l is the overall length of the member, in metres (m); fm,k is the characteristic bending strength of the member, in Newtons per square millimetre (N/mm2). NOTE Attention should be drawn on the influence of thickness of structural members on their out-of-plane behaviour. This aspect should be addressed in the design, especially when the structural members are subject to high loads. 5.4.2 Wane Wane shall not occur within the area of any jointing device or within support areas of the prefabricated timber structural member.
5.4.3 Joint gaps Within the area of the fastener, the average gap between two adjacent parts of the prefabricated timber structural members at the time of fabrication shall not exceed 1,5 mm. SIST EN 14250:2010
EN 14250:2010 (E) 10 5.4.4 Moisture content The maximum moisture content of the timber and of timber wedges, if any, at the time of fabrication of the prefabricated timber structural member shall not exceed 22 %. The moisture content shall be estimated in accordance with EN 13183-2 using a calibrated electric resistance moisture meter. 5.4.5 Dimensional accuracy of member The overall horizontal and vertical dimensions of the structural member shall not deviate from the specified dimensions by more than:
dimensions up to and including 10 m: ± 10 mm;
dimensions more than 10 m: ± 1 mm/m. The dimensional variation between members within the same batch shall not differ by more than 10 mm. 5.4.6 Dimensional stability If required, swelling and shrinkage of prefabricated structural members shall be calculated according to EN 1995-1-1, using the material properties given in 4.1.3. 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. 5.4.7 Camber At the time of fabrication of the timber structural member, camber shall be within a tolerance of 25 % of the camber specified in the design. 5.4.8 Live knots Live knots shall be permitted within the anchorage area of the prefabricated timber structural member, provided that the plate projections are satisfactorily embedded without visible distortion of the fasteners or splitting of the timber outside the knot.
5.4.9 Dead knots, knot holes or fissures Where a dead knot, knot hole, or fissure occurs within the anchorage area of the prefabricated timber structural member, the area of effective plate projections, disregarding those in the dead knot, knot hole or on the line of the fissure shall be in accordance with that specified in the design. Fissures which do not extend more than 50 mm from the tooth, burst or plate nail which apparently caused them, shall be disregarded. 5.4.10 Fastener positioning Fasteners used for the prefabricated timber structural member shall not be misplaced by more than the amount considered in the structural design and not more than 10 mm in any direction in relation to the design position.
5.4.11 Fastener embedment The plate projections of the fastener shall be inserted perpendicular to the embedment surface of the timber and the plate surface shall be free of distortion. Any gap between the timber surface and the underside of a punched metal plate fastener shall not exceed 1 mm and shall not occur over more than 25 % of the anchorage area in any prefabricated timber structural member in any joint. SIST EN 14250:2010
EN 14250:2010 (E) 11 5.4.12 Protruding fasteners Punched metal plate fasteners shall not protrude outside the outer edges of the prefabricated timber structural member. The lower edge of fasteners intended to be located over a point of support shall be at least 3 mm from the lower edge of the member in contact with the support.
NOTE It is important that consideration is given to masking of protruding corners of fasteners, particularly those that protrude into walk spaces or other areas permitting access. 6 Product documents 6.1 General Adequate drawings and written instructions shall be provided with the prefabricated members relating to their transport, handling, storage, erection, positioning and internal bracing, together with any fixing details necessary to construct compound or multi-part structures. 6.2 Drawings and structural design information 6.2.1 Drawings
The drawings of the prefabricated timber structural member shall as a minimum contain:
the main dimensions and tolerance classes;
the cross section sizes and strength grades of the timber components;
the punched metal plate type, size, orientation and position on each joint;
the punched metal plate fastener assembly tolerance;
precamber, if any;
connections to be done on the building site including other fastener types and sizes;
position of supports and minimum support lengths;
the requirements on bracing of compressed components;
notation of points suitable for hanging to crane;
spacing of members;
treatment with timber preservatives against biological attack and durability class. 6.2.2 Structural design documentation When the structural design of the prefabricated member is covered (i.e. Method 2 or 3b) the following information shall be provided in addition to the drawing of the member: a) Method 2: 1) the design codes that have been used to verify the design (EN 1995-1-1); 2) the design software used, if any, unambiguously identified; 3) designer responsible for the structural design of the member; SIST EN 14250:2010
EN 14250:2010 (E) 12 4) material values necessary as input for calculation; 5) safety factors and other NDPs, if any, used in the calculation; 6) calculation results. b) Method 3b: 1) the design codes that have been used to verify the design (EN 1995-1-1);
2) the place of use of the member; 3)
the design software used, if any, unambiguously identified; 4) designer responsible for the structural design of the member; 5) all the actions (loads) imposed on the member;
6) requirements for the serviceability limit states (i.e. deflection limits); 7) material values necessary as input for calculation; 8) safety factors and other NDPs, if any, used in the calculation; 9) calculation results. 7 Evaluation of conformity 7.1 General The conformity of a prefabricated timber structural member with the requirements of this European Standard and with the stated values shall be demonstrated by: a) initial type testing; b) factory production contr
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