BS EN 14399-2-2015 High-strength structural bolting assemblies for preloading Suitability for preloading《预加负荷用高强度结构螺栓组件 预加负荷的适用性》.pdf

1、BSI Standards PublicationBS EN 14399-2:2015High-strength structuralbolting assemblies forpreloadingPart 2: Suitability for preloadingBS EN 14399-2:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 14399-2:2015.It supersedes BS EN 14399-2:2005 which is withdra

2、wn.The UK participation in its preparation was entrusted to TechnicalCommittee FME/9/-/2, Fasteners for structural bolting.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a co

3、ntract. Users are responsible for its correctapplication. The British Standards Institution 2015. Published by BSI StandardsLimited 2015ISBN 978 0 580 81778 6ICS 21.060.01Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the aut

4、hority of theStandards Policy and Strategy Committee on 28 February 2015.Amendments issued since publicationDate Text affectedBS EN 14399-2:2015EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 14399-2 February 2015 ICS 21.060.01 Supersedes EN 14399-2:2005English Version High-strength structural

5、bolting assemblies for preloading - Part 2: Suitability for preloading Boulonnerie de construction mtallique haute rsistance apte la prcontrainte - Partie 2 : Aptitude lemploi pour la mise en prcontrainte Hochfeste vorspannbare Garnituren fr Schraubverbindungen im Metallbau - Teil 2: Eignung zum Vor

6、spannen This European Standard was approved by CEN on 18 October 2014. 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 bibliograph

7、ical references concerning such national standards may be obtained on application to the CEN-CENELEC 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 responsibilit

8、y of a CEN member into its own language and notified to the CEN-CENELEC 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, Former Yugoslav Republic of

9、 Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATIO

10、N EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 14399-2:2015 EBS EN 14399-2:2015EN 14399-2:2015 (E) 2 Contents Page Foreword 3 I

11、ntroduction .4 1 Scope 5 2 Normative references 5 3 Terms and definitions .5 4 Symbols and units .6 5 Technical requirements for structural bolting assemblies .7 5.1 Composition of bolting assemblies .7 5.2 Manufacturing requirements 9 5.3 Marking of the components of the bolting assemblies .9 5.4 D

12、elivery conditions for the bolting assemblies 9 5.5 Information to be supplied . 10 6 Suitability test . 10 6.1 Principle of the test. 10 6.2 Test apparatus 11 6.3 Test assemblies 11 6.4 Test set-up . 12 6.5 Test procedure 12 6.6 Evaluation of the test results . 13 6.6.1 Rotation/bolt force curve .

13、13 6.6.2 Torque/bolt force curve for the torque at the design preload 14 6.6.3 Elongation/bolt force curve . 15 6.6.4 Torque/bolt force curve for the individual values of the bolt force at a specified value of the applied torque . 16 6.7 Test report . 16 Annex A (informative) Special testing conditi

14、ons and procedures 18 Bibliography . 19 BS EN 14399-2:2015EN 14399-2:2015 (E) 3 Foreword This document (EN 14399-2:2015) has been prepared by Technical Committee CEN/TC 185 “Fasteners”, the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard,

15、either by publication of an identical text or by endorsement, at the latest by August 2015 and conflicting national standards shall be withdrawn at the latest by November 2016. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN a

16、nd/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 14399-2:2005. In comparison with EN 14399-2:2005, the following modifications have been made: technical requirements and delivery conditions for bolting assemblies have been transfe

17、rred from EN 14399-1; Table 1 containing the overview of the composition of bolting assemblies and component marking has been added; requirements for necessary information on the use of tightening methods to be stated on the label or packaging have been added; requirements for the test report have b

18、een revised. EN 14399 consists of the following parts, under the general title High-strength structural bolting assemblies for preloading: Part 1: General requirements; Part 2: Suitability for preloading; Part 3: System HR Hexagon bolt and nut assemblies; Part 4: System HV Hexagon bolt and nut assem

19、blies; Part 5: Plain washers; Part 6: Plain chamfered washers; Part 7: System HR Countersunk head bolt and nut assemblies; Part 8: System HV Hexagon fit bolt and nut assemblies; Part 9: System HR or HV Direct tension indicators for bolt and nut assemblies; Part 10: System HRC Bolt and nut assemblies

20、 with calibrated preload. 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, Former Yugoslav Republic

21、 of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 14399-2:2015EN 14399-2:2015 (E) 4 Introduction This doc

22、ument on structural bolting reflects the situation in Europe where two technical solutions exist to achieve the necessary ductility of bolt/nut/washer(s) assemblies. These solutions consist of two different systems (HR and HV) of bolt/nut/washer assemblies (see Table 1). Both systems are well proven

23、 and it is the responsibility of the experts using structural bolting whether they use the one or the other system. It is, however, important for the performance of the assembly to avoid mixing up the components of both systems. Therefore, bolts and nuts for both systems are standardized in one sing

24、le part of this European Standard each and the marking of the components of the same system is uniform. Preloaded bolted assemblies are very sensitive to differences in manufacture and lubrication. Therefore, it is important that the bolting assemblies are supplied by one manufacturer who is always

25、responsible for the functionality of the bolting assemblies. For the same reason it is important that coating of the bolting assemblies is under the control of one manufacturer. Beside the mechanical properties of the components, the functionality of the bolting assemblies requires that the specifie

26、d preload can be achieved if the bolting assemblies are tightened with a suitable procedure. For this purpose, a test method for the suitability of the bolting assemblies for preloading was created, which will demonstrate whether the functionality of the bolting assemblies is fulfilled. It should be

27、 pointed out that compared to ISO 272 the widths across flats (large series) for M12 and M20 have been changed to 22 mm and 32 mm respectively. These changes are justified by the following reasons. Under the specific conditions of structural bolting, the compressive stresses under the bolt head or n

28、ut for the sizes M12 may become too large with the width across flats of 21 mm, especially if the washer is fitted eccentrically to the bolt axis. For the size M20, the width across flats of 34 mm is very difficult to be produced. The change to 32 mm is primarily motivated by economics but it should

29、 also be pointed out that the width across flats of 32 mm was common practice in Europe. BS EN 14399-2:2015EN 14399-2:2015 (E) 5 1 Scope This European Standard specifies the technical requirements for high-strength structural bolting assemblies in order to ensure the suitability for preloading of bo

30、lted connections in metallic structures. A suitability test is specified to check the behaviour of the structural bolting assemblies so as to ensure that the required preload can be reliably obtained by the tightening methods specified in EN 1090-2 with sufficient margins against overtightening and

31、against failure. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (in

32、cluding any amendments) applies. EN 1090-2, Execution of steel structures and aluminium structures - Part 2: Technical requirements for steel structures EN 14399-1:2015, High-strength structural bolting assemblies for preloading - Part 1: General requirements EN 14399-3, High-strength structural bol

33、ting assemblies for preloading - Part 3: System HR - Hexagon bolt and nut assemblies EN 14399-4, High-strength structural bolting assemblies for preloading - Part 4: System HV - Hexagon bolt and nut assemblies EN 14399-5, High-strength structural bolting assemblies for preloading - Part 5: Plain was

34、hers EN 14399-6, High-strength structural bolting assemblies for preloading - Part 6: Plain chamfered washers EN 14399-7, High-strength structural bolting assemblies for preloading - Part 7: System HR - Countersunk head bolt and nut assemblies EN 14399-8, High-strength structural bolting assemblies

35、for preloading - Part 8: System HV - Hexagon fit bolt and nut assemblies EN 14399-9, High-strength structural bolting assemblies for preloading - Part 9: System HR or HV - Direct tension indicators for bolt and nut assemblies EN 14399-10, High-strength structural bolting assemblies for preloading -

36、Part 10: System HRC - Bolt and nut assemblies with calibrated preload EN ISO 898-1, Mechanical properties of fasteners made of carbon steel and alloy steel - Part 1: Bolts, screws and studs with specified property classes - Coarse thread and fine pitch thread (ISO 898-1) EN ISO 898-2, Mechanical pro

37、perties of fasteners made of carbon steel and alloy steel - Part 2: Nuts with specified property classes - Coarse thread and fine pitch thread (ISO 898-2) 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 14399-1:2015 apply. BS EN 14399-2:2015EN 14399-2

38、:2015 (E) 6 4 Symbols and units A elongation, (mm) Asnominal stress area of the bolt, (mm2) (see EN ISO 898-1) d nominal thread diameter, (mm) Fbbolt force during the test, (kN) Fbiindividual value of the bolt force related to a given nut rotation, torque or bolt elongation, (kN) Fbmmean value of Fb

39、ivalues, (kN) Fbi,maxindividual value of the maximum bolt force reached during the test, (kN) Fp,Crequired preload of 0,7 fubAs, (kN) fubnominal tensile strength (Rm,nom), (MPa) k k-factor kiindividual value of the k-factor kmmean value of the k-factor lb,effeffective preloaded bolt length given as

40、the clamp length (t) plus half the nominal nut height, (mm) M torque applied during the test, (Nm) Miindividual value of the torque applied during the test, (Nm) Mpiindividual value of the torque at which the bolt force has first reached the value of Fp,C, (Nm) Mspecspecified value of the torque to

41、be applied to the bolting assemblies, (Nm) n number of test results sFestimated standard deviation of the Fbivalues for a tightening torque Mspecskestimated standard deviation of the ki-values for the preload Fp,CVkcoefficient of variation of the k-factor for the preload Fp,C angle of rotation of th

42、e nut relative to the bolt, () piindividual value of the angle at which the bolt force has first reached the value of Fp,C, () 1iindividual value of the angle at which the bolt force has reached its maximum value Fbi,max, () 2iindividual value of the angle , () 1iindividual angle difference (1i pi),

43、 () 2iindividual angle difference (2i pi), () 2minminimum required value of the angle difference 2ias specified in the relevant product standard () t clamp length given as the total thickness of the clamped parts between the nut bearing face and the bolt head bearing face, (mm) BS EN 14399-2:2015EN

44、14399-2:2015 (E) 7 5 Technical requirements for structural bolting assemblies 5.1 Composition of bolting assemblies The performance of the high-strength structural bolting assemblies as specified in Table 1 depends on the properties of their specific components. Therefore, the essential characterist

45、ics listed in EN 14399-1 are assessed through the verification of the properties of the components and/or bolting assemblies, as applicable. Other aspects dealing with marking and delivery conditions are assessed through inspection of the involved components and/or bolting assemblies, as applicable.

46、 BS EN 14399-2:2015EN 14399-2:2015 (E) 8 Table 1 Composition of high-strength structural bolting assemblies and component marking Type of bolting assembly System HR System HV System HRC General requirements EN 14399-1 Suitability for preloading EN 14399-2 and, if any, additional testing specified in

47、 the product standard Bolt and nut EN 14399-3 EN 14399-7 EN 14399-4 EN 14399-8 EN 14399-10 MarkingBolt HR8.8 HR10.9 HR8.8 HR10.9 HV10.9 HVP10.9 HRC10.9 Nut HR8 or HR10 HR10 HR8 or HR10 HR10 HV10 HV10 HR10 HRD10 Washer(s) EN 14399-5aor EN 14399-6 EN 14399-6 EN 14399-5aor EN 14399-6 Marking H or HRbH

48、or HVbH or HRbH or HRbor HDcDirect tension indicator and nut face washer or bolt face washer, if any EN 143999 Not applicable MarkingDirect tension indicator H8 H10 H8 H10 H10 Nut face washer HN HN Bolt face washer HB Not applicable HB aEN 14399-5 can only be used under the nut. bAt the choice of th

49、e manufacturer. cMandatory mark for washers with enlarged outer diameter according to EN 14399-5 only. BS EN 14399-2:2015EN 14399-2:2015 (E) 9 In order to contribute to the reduction of the risk of hydrogen embrittlement and other hydrogen related failures, the underhead radius of bolts as specified in EN 14399-3, EN 14399-4, EN 14399-8 or EN 14399-10 shall be used for any bolts of property class 10.9. HR bolts (see EN 14399-3 or EN 14399-7) and HRC bolts (see EN 14399-10) which are too short thre