BS EN 15080-8-2009 Extended application of results from fire resistance tests Beams《耐火性试验结果的扩展式应用 远光灯》.pdf

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1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 15080-8:2009Extended application of resultsfrom fire resistance testsPart 8: BeamsLicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 21/11/2011 01:41, Uncontrolled Copy

2、, (c) BSIBS EN 15080-8:2009 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 15080-8:2009.The UK participation in its preparation was entrusted to TechnicalCommittee FSH/22/-/10, Fire resistance testing for loadbearingelements (excluding walls).A list of organiza

3、tions represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2011ISBN 978 0 580 54767 6ICS 13.220.50; 91.060.99Compliance with a British Sta

4、ndard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 July 2011.Amendments issued since publicationDate Text affectedLicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 21/11/2011 01:41, Uncon

5、trolled Copy, (c) BSIBS EN 15080-8:2009EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 15080-8 October 2009 ICS 13.220.50; 91.060.99 English Version Extended application of results from fire resistance tests - Part 8: Beams Application tendue des rsultats des essais de rsistance au feu - Partie

6、 8 : Poutres Erweiterter Anwendungsbereich der Ergebnisse aus Feuerwiderstandsprfungen - Teil 8: Balken This European Standard was approved by CEN on 10 February 2008. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European St

7、andard 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, Fre

8、nch, 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, Cyprus

9、, 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 COMI

10、T EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2009 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 15080-8:2009: ELicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARD

11、S, 21/11/2011 01:41, Uncontrolled Copy, (c) BSIBS EN 15080-8:2009EN 15080-8:2009 (E) 2 Contents Page Foreword . 4 1 Scope 5 2 Normative references . 5 3 Terms and definitions . 5 4 Basis and methodology of establishing the extended application . 6 4.1 General . 6 4.2 Basic principles . 7 4.2.1 Gener

12、al . 7 4.2.2 Basis of the extended application . 7 4.2.3 Mode of failure . 7 4.2.4 Methods of analysis 7 4.3 Basic thermal analysis . 8 4.4 Basic structural analysis 8 4.4.1 General . 8 4.4.2 Modelling factor 8 4.4.3 Material properties 9 4.5 Analysis of other features 10 5 Critical parameters 10 5.

13、1 General . 10 5.2 Common thermal parameters 10 5.3 Common mechanical parameters . 11 5.4 Common constructional parameters 11 5.5 Specific constructional parameters for beams without applied fire protection . 11 5.5.1 Concrete beams 11 5.5.2 Steel beams . 12 5.5.3 Composite steel-concrete beams 12 5

14、.5.4 Timber beams 12 5.5.5 Mechanically jointed beams 13 5.6 Specific constructional parameters for beams with applied fire protection 13 6 Report of the extended application analysis . 14 Annex A (informative) Guidelines for making assessments 15 A.1 Mode of failure . 15 A.1.1 General . 15 A.1.2 Fa

15、ilure of protection system 15 A.1.3 Change of structural mode of failure from bending to shear . 15 A.1.4 Change of structure mode of failure from bending to connection failure 16 A.2 Effect of material strength . 16 A.3 Extrapolation of fire resistance . 17 A.4 Accuracy of predictions . 17 A.5 Pred

16、iction based on material laws 18 A.6 Modifying predicted temperatures 18 A.7 Deflection limits 19 Annex B (informative) The Extended Application Of Steel Beams 20 B.1 Introduction . 20 B.2 Analysis of reference tests 20 B.2.1 Thermal performance . 20 B.2.2 Mechanical performance 21 B.2.3 Other featu

17、res 22 B.3 Model for extended application . 22 Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 21/11/2011 01:41, Uncontrolled Copy, (c) BSIBS EN 15080-8:2009EN 15080-8:2009 (E) 3 Annex C (informative) The Extended Application Of Timber Beams 24 C.1 Introduction . 24 C.2 Extended application i

18、n the load domain (increase of load-bearing capacity) 24 C.2.1 Increasing of load-bearing capacity by higher strength class . 24 C.2.2 Increasing of load-bearing capacity by increasing beam dimensions (braced beams) 25 C.2.3 Increasing of load-bearing capacity by decreasing the fire resistance 26 C.

19、3 Extended application in the time domain: Increasing fire resistance by applied fire protection 30 Annex D (informative) The Extended Application of a Composite Steel Concrete Beam . 32 D.1 Introduction . 32 D.1.1 General . 32 D.1.2 Reference test 1 33 D.1.3 Reference test 2 33 D.2 Analysis of refe

20、rence tests 34 D.2.1 Thermal performance . 34 D.2.2 Reference test 1 34 D.2.3 Reference test 2 35 D.2.4 Structural performance 36 D.2.5 Bending resistance . 36 D.2.6 Assessment of reference test 1 . 36 D.2.7 Assessment of reference test 2 . 37 D.2.8 Conclusions of structural performance 38 D.2.9 Mod

21、el for extended application . 38 D.2.10 Extended application 38 Annex E (informative) The extended application of concrete beams . 41 E.1 Introduction . 41 E.2 Failure modes 41 E.3 Examples . 41 E.3.1 Possible change of failure mode . 41 E.3.2 Change of cross section 42 E.3.3 Change of material stre

22、ngth 42 E.3.4 Axial and rotational restraint . 43 Bibliography . 44 Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 21/11/2011 01:41, Uncontrolled Copy, (c) BSIBS EN 15080-8:2009EN 15080-8:2009 (E) 4 Foreword This document (EN 15080-8:2009) has been prepared by Technical Committee CEN/TC 127

23、“Fire safety in buildings”, the secretariat of which is held by BSI. 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 April 2010, and conflicting national standards shall be withdrawn at the latest

24、 by April 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 has been prepared under a mandate given to CEN by the Eu

25、ropean Commission and the European Free Trade Association, and supports essential requirements of EC Directive(s). According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulga

26、ria, 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. Licensed Copy: Wang Bin, ISO

27、/EXCHANGE CHINA STANDARDS, 21/11/2011 01:41, Uncontrolled Copy, (c) BSIBS EN 15080-8:2009EN 15080-8:2009 (E) 5 1 Scope This part of EN 15080 identifies the parameters and factors that affect the fire resistance of beams and need to be taken into account when considering extended application of resul

28、ts of beams tested in accordance with EN 1365-3. It also gives the methodology to be used when preparing an extended application, including rules and calculation methods which can be applied to establish the resultant influence of a variation in one or more parameters and to determine the field of e

29、xtended application. 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 33

30、8, Structural timber Strength classes EN 1194, Timber structures Glued laminated timber Strength classes and determination of characteristic values EN 1363-1:1999, Fire resistance tests Part 1: General Requirements EN 1365-3:1999, Fire resistance tests for loadbearing elements Part 3: Beams EN 10025

31、-1, Hot rolled products of structural steels Part 1: General technical delivery conditions EN 10025-2, Hot rolled products of structural steels Part 2: Technical delivery conditions for non-alloy structural steels EN 100801, Steel for the reinforcement of concrete Weldable reinforcing steel Part 1:

32、General requirements prEN 10138-1, Prestressing steels Part 1: General requirements EN 13501-2, Fire classification of construction products and building elements Part 2: Classification using data from fire resistance tests, excluding ventilation services EN ISO 13943:2000, Fire safety Vocabulary (I

33、SO 13943:2000) 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN ISO 13943:2000, EN 1363-1:1999 and EN 1365-3:1999, together with the following apply. 3.1 test result outcome of a testing process and its associated procedures detailed within EN 1365-3 (

34、which may include some processing of the results from the testing of a number of specimens). A test result is expressed in terms of one or more fire performance parameter(s) 3.2 direct field of application of test results outcome of a process (involving the application of defined rules) whereby a te

35、st result is deemed to be equally valid for variations in one or more of the product properties and/or intended end use application(s) NOTE The direct field of application of test results are presented in EN 1365-3. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 21/11/2011 01:41, Uncontrolle

36、d Copy, (c) BSIBS EN 15080-8:2009EN 15080-8:2009 (E) 6 3.3 extended field of application of test results outcome of a process (involving the application of defined rules that may incorporate calculation procedures) that predicts, for a variation of a product property and/or its intended end use appl

37、ication(s), a test result on the basis of one or more test results to the same test standard, i.e. to EN 1365-3 3.4 classification process defined in EN 13501-2, whereby the fire performance parameters obtained from the results of one test, or a set of tests, or from a process of extended applicatio

38、n, are compared with limiting values for those parameters that are set as criteria for achieving a certain classification NOTE The relevant classes and related criteria for fire resistance are specified in Commission Decisions (2000/367/EC, 2000/147/EC and 2001/671/EC). 3.5 reference test fire resis

39、tance test according to EN 1365-3 on a beam from which the test result is used for the process of extended application NOTE There may be more than one reference test. 3.6 parameter aspect of the reference scenario that may vary in practice and may result in a change of the fire resistance performanc

40、e NOTE Examples are the load level and the span. 3.7 modelling factor factor determined for a considered relevant structural failure mode on basis of the assessment of the reference test(s), which takes into account the differences between the test results and calculated results, and which is used t

41、o adjust the results of the extended application 3.8 calculated structural resistance resistance to bending or shear of a beam in a fire test calculated at the end of the test 3.9 effective structural resistance predicted resistance to bending or shear of a beam for use in an extended application 3.

42、10 relative resistance ratio of the bending or shear resistance of a beam in a fire resistance test to the resistance at normal temperatures calculated with all safety factors taken as unity 3.11 target classification fire resistance that the extended application is required to achieve 4 Basis and m

43、ethodology of establishing the extended application 4.1 General An extended application analysis is required when the application of a beam is not covered by the field of direct application given in the classification document of the product. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 21

44、/11/2011 01:41, Uncontrolled Copy, (c) BSIBS EN 15080-8:2009EN 15080-8:2009 (E) 7 The situation of (a) fire test(s) carried out according to EN 1365-3 will be referred to as the “reference test” and “reference scenario”. The result of a test, i.e. the fire resistance with respect to the load bearing

45、 capacity, will be referred as “tref,fi”. If more than one reference test is available, all the tests may be used for the extended application provided that the tests all have the same mechanical boundary conditions and have all been carried out using the same fire curve. NOTE It is possible that in

46、 the classification report all reference beams are classified with the same classification “Rref” although the actual test results (tref,fi) given in the test reports may differ. 4.2 Basic principles 4.2.1 General It is assumed that extended application is made by appropriately qualified and experie

47、nced persons in the field of structural fire design. The reference test(s) shall be well documented, i.e. an insight into the performance of the test specimen(s) and the mode of failure, leading to Rref, are available. Three analyses (described in 4.3, 4.4 and 4.5) should be carried out where approp

48、riate. It shall be decided whether: field of application can be extended, maintaining the classification Rrefor changing the classification and if so, by how much; extension is not possible (new tests are required). Any predicted increase in fire resistance shall not exceed the lesser of 15 min and

49、20 % of the target classification. NOTE This is illustrated in A.3. 4.2.2 Basis of the extended application An adequate understanding of the structural and thermal performance, as well as an understanding of other relevant features, shall be achieved based on the scope of the required extended application. For minor or obvious extensions to the reference test, the depth of analysis required may be reduced. 4.2.3 Mode of failure Any assessment shall consider the possibility that the mode or cause of failure, such as structural collapse in bending or