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: BeamsBS EN 15080-8:2009 BRITISH STANDARDNational forewordThis British Standard is the UK implem
2、entation 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 organizations represented on this committee can beobtained on request to its secretary.This publication doe
3、s 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 Standard cannot confer immunity fromlegal obligations.This British Standard was published under the au
4、thority of theStandards Policy and Strategy Committee on 31 July 2011.Amendments issued since publicationDate Text affectedBS 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 re
5、sistance tests - Part 8: Beams Application tendue des rsultats des essais de rsistance au feu - Partie 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 compl
6、y 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 Manageme
7、nt 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
8、official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia
9、, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT 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
10、 CEN national Members. Ref. No. EN 15080-8:2009: EBS 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 Ge
11、neral . 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
12、 5.1 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 1
13、2 5.5.4 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
14、 Failure 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 P
15、rediction 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 fe
16、atures 22 B.3 Model for extended application . 22 BS 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 in the load domain (increase of load-bearing capacity) 24 C.2.1 Increasing of load-bearing capaci
17、ty 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.3 Extended application in the time domain: Increasing fire resistance by applied fire protection
18、 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 reference tests 34 D.2.1 Thermal performance . 34 D.2.2 Reference test 1 34 D.2.3 Reference test 2 3
19、5 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 Model for extended application . 38 D.2.10 Extended application 38 Annex E (informative) The extend
20、ed 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 strength 42 E.3.4 Axial and rotational restraint . 43 Bibliography . 44 BS EN 15080-8:2009EN 15080-8
21、:2009 (E) 4 Foreword This document (EN 15080-8:2009) has been prepared by Technical Committee CEN/TC 127 “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 endo
22、rsement, at the latest by April 2010, and conflicting national standards shall be withdrawn at the latest 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 identify
23、ing any or all such patent rights. 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 EC Directive(s). According to the CEN/CENELEC Internal Regulations, the national standards organi
24、zations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Rom
25、ania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS 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
26、 results 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 fiel
27、d of extended 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.
28、 EN 338, 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
29、 10025-1, 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 Pa
30、rt 1: 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 Vocabul
31、ary (ISO 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 13
32、65-3 (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) whereb
33、y a test 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. BS EN 15080-8:2009EN 15080-8:2009 (E) 6 3.3 extended field of application of t
34、est 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 application(s), a test result on the basis of one or more test results to the same test standard,
35、 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 application, are compared with limiting values for those parameters that are set as criteria for achiev
36、ing 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 resistance test according to EN 1365-3 on a beam from which the test result is used for the proces
37、s 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 performance NOTE Examples are the load level and the span. 3.7 modelling factor factor determined for a
38、 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 to adjust the results of the extended application 3.8 calculated structural resistance resista
39、nce 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 3.10 relative resistance ratio of the bending or shear resistance of a beam in a fire resistanc
40、e 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 methodology of establishing the extended application 4.1 General An extended application analy
41、sis 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. BS 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 tes
42、t” and “reference scenario”. The result of a test, i.e. the fire resistance with respect to the load bearing 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 mechani
43、cal boundary conditions and have all been carried out using the same fire curve. NOTE It is possible that in 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 pri
44、nciples 4.2.1 General It is assumed that extended application is made by appropriately qualified and experienced 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, leadi
45、ng to Rref, are available. Three analyses (described in 4.3, 4.4 and 4.5) should be carried out where appropriate. 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 (n
46、ew tests are required). Any predicted increase in fire resistance shall not exceed the lesser of 15 min and 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 u
47、nderstanding 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
48、or cause of failure, such as structural collapse in bending or failure of a fire protection system, might change and that the mode or cause of failure in a fire test may no longer be critical if one or more parameters are changed. If a change of failure mode is expected, then extended application is
49、 not possible unless additional information is available. NOTE For additional information see A.1. 4.2.4 Methods of analysis When analysing the reference test(s), the rules given in the Eurocodes shall be used if applicable. Additional rules are given in this standard. These are also applicable in cases where the Eurocodes do not fully cover the construction to be assessed. Other calculation models, as well as empirical rules, shall be validated on the basis of similar tests as the reference test(s). Historic data and ad hoc tests may be used to sup
