SIST EN 13381-9:2015
(Main)Test methods for determining the contribution to the fire resistance of structural members - Part 9: Applied fire protection systems to steel beams with web openings
Test methods for determining the contribution to the fire resistance of structural members - Part 9: Applied fire protection systems to steel beams with web openings
This European Standard specifies a test and assessment method for determining the contribution made by fire protection systems to the fire resistance of structural steel beam I and H members in the horizontal plane containing openings in the web. This Standard applies to beams subject to 3 or 4 sided fire exposure.
This Standard applies to fire protection materials that have already been tested and assessed in accordance with EN 13381-4 or EN13381-8. i.e. prEN 13381-9 cannot be used in isolation. Use of prEN 13381-9 requires the multi-temperature analysis (MTA) derived from EN 13381-4 or EN 13381-8 as the basis for determining thickness for beams with web openings. This MTA shall be carried out on the web and bottom flange separately generating an elemental multi-temperature analysis (EMTA). The bottom flange EMTA may be used as the top flange EMTA when a beam is subject to 4 sided exposure.
This European Standard contains the fire test methodology, which specifies the tests which shall be carried out to provide data on the thermal characteristics of the fire protection system, when exposed to the standard temperature/time curve specified in EN 1363-1.
This European standard also contains the assessment, which prescribes how the analysis of the test data should be made and gives guidance on the procedures which should be undertaken.
The assessment procedure is used to establish:
a) on the basis of the temperature data derived from testing unloaded steel sections, the thermal response of the fire protection system on cellular beams, (the thermal performance).
b) the temperature ratio between the web post and the web reference temperature, which will vary depending on the web post width.
c) the temperature ratio between points around the web openings and the web reference area
d) the elemental multi temperature analysis from either EN 13381-4 or EN 13381-8 shall be reassessed and reported against elemental A/V for each fire resistance period.
A structural model shall be used to derive limiting temperatures for cellular beams using the data from b), c) and d) above.
Prüfverfahren zur Bestimmung des Beitrages zum Feuerwiderstand von tragenden Bauteilen - Teil 9: Brandschutzmaßnahmen für Stahlträger mit Stegöffnungen
Diese Europäische Norm legt ein Prüf- und Beurteilungsverfahren zur Bestimmung des Beitrages von Brandschutzsystemen zum Feuerwiderstand von tragenden Stahlträger-I- und H-Profilen in der horizontalen Ebene fest, welche Öffnungen im Steg aufweisen. Diese Norm gilt für Träger, die an 3 oder 4 Seiten der Brandeinwirkung ausgesetzt sind.
Diese Norm gilt für Brandschutzmaterialien, die bereits nach EN 13381 4 oder EN 13381-8 geprüft und bewertet wurden, d. h. prEN 13381 9 kann nicht losgelöst davon angewendet werden. Für die Anwendung von prEN 13381 9 ist die aus EN 13381 4 oder EN 13381-8 abgeleitete Mehrfachtemperaturanalyse (MTA) als Grundlage für die Bestimmung der Brandschutzdicke für Träger mit Stegöffnungen erforderlich. Diese MTA muss am Steg und am Unterflansch getrennt durchgeführt werden, was zu einer elementaren Mehrfachtemperaturanalyse (EMTA) führt. Die EMTA für den Unterflansch darf bei Trägern, die einer 4 seitigen Brandeinwirkung ausgesetzt sind, als EMTA für den Oberflansch verwendet werden.
Diese Europäische Norm enthält eine Methodik für Brandprüfungen, welche die Prüfungen beschreibt, die zur Ermittlung von Daten über die thermischen Eigenschaften des Brandschutzsystems bei Beanspruchung unter den Bedingungen der Einheits-Temperaturzeitkurve nach EN 1363-1 durchzuführen sind.
Diese Europäische Norm enthält darüber hinaus die Beurteilung, die festlegt, wie die Analyse der Messwerte durchgeführt werden sollte, sowie Hinweise zu den anzuwendenden Verfahren.
Das Verfahren der Beurteilung wird angewendet, um:
a) auf der Grundlage der Temperaturmesswerte, die sich aus den Prüfungen von unbelasteten Stahlprofilen ergeben, das thermische Verhalten des Brandschutzsystems auf Lochstegträgern zu ermitteln (thermische Leistungsfähigkeit);
b) das Verhältnis der Temperatur des Stegpfostens zur Bezugstemperatur des Stegs, das in Abhängigkeit von der Stegbreite schwankt, zu ermitteln;
c) das Verhältnis der Temperatur der Punkte um die Stegöffnungen herum zur Temperatur im Bezugsbereich des Stegs zu ermitteln;
d) die elementare Mehrfachtemperaturanalyse entweder aus EN 13381 4 oder EN 13381 8 erneut zu bewerten und im Vergleich zum elementaren A/V-Verhältnis für jede Feuerwiderstandsdauer anzugeben.
Es ist ein Strukturmodell zu verwenden, um die Grenztemperaturen für Lochstegträger anhand der vorstehenden Angaben aus b), c) und d) abzuleiten.
Méthodes d'essai pour déterminer la contribution à la résistance au feu des éléments de construction - Partie 9: Systèmes de protection au feu appliqués aux poutres alvéolaires en acier
La présente Norme européenne spécifie une méthode d'essai et d'évaluation permettant de déterminer la contribution des systèmes de protection au feu à la résistance au feu des éléments en I et en H des poutres en acier de construction dans le plan horizontal contenant des ouvertures dans l'âme. La présente norme s'applique aux poutres soumises à une exposition au feu sur 3 ou 4 côtés.
La présente norme s'applique aux matériaux de protection au feu qui ont déjà été soumis à l'essai et évalués conformément à l'EN 13381-4 ou à l'EN13381-8, c'est-à-dire que le prEN 13381-9 ne peut pas être utilisé isolément. L'utilisation du prEN 13381-9 nécessite d'employer l'analyse de plusieurs températures (MTA) tirée de l'EN 13381-4 ou de l'EN 13381-8 comme base de la détermination de l'épaisseur à appliquer aux poutres alvéolaires. Cette MTA doit être conduite séparément sur l'âme et sur la semelle inférieure en générant une analyse élémentaire de plusieurs températures (EMTA). L'EMTA de la semelle inférieure peut être utilisée comme l'EMTA de la semelle supérieure lorsqu'une poutre est soumise à une exposition sur les 4 côtés.
La présente Norme Européenne contient la méthodologie d’essai au feu, qui spécifie les essais qui doivent être réalisés pour fournir des données sur les caractéristiques thermiques du système de protection au feu lorsqu’il est exposé à la courbe température/temps de la norme prescrite dans l’EN 1363-1.
La présente Norme européenne comprend également l'évaluation qui prescrit la façon d'effectuer l'analyse des données d'essai et les lignes directives des modes opératoires qu'il convient d'entreprendre.
Le mode opératoire de l’évaluation permet d’établir :
a) d'après les températures tirées des essais effectués sur des petits tronçons d'acier non chargés, la réponse thermique du système de protection au feu sur les poutres alvéolaires (les performances thermiques) ;
b) le rapport de températures entre la température de la membrure pleine et la température de référence de l'âme, qui variera en fonction de la largeur de la membrure pleine ;
c) le rapport de températures entre les points situés autour des ouvertures d'âme et la surface de référence de l'âme ;
d) l'analyse élémentaire de plusieurs températures issue de l'EN 13381-4 ou de l'EN 13381-8 doit être réévaluée et rapportée en fonction de la massiveté élémentaire A/V pour chaque durée de résistance au feu.
Un modèle structurel doit être utilisé pour déduire les températures limites pour les poutres alvéolaires à l'aide des données tirées de b), c) et d) ci-dessus.
Preskusne metode za ugotavljanje prispevka k požarni odpornosti konstrukcijskih elementov - 9. del: Požarno zaščitni sistemi za jeklene nosilce z odprtinami v stojini
Ta evropski standard določa metodo za preskušanje in oceno za ugotavljanje prispevka požarno zaščitnega sistema k požarni odpornosti konstrukcijskih jeklenih nosilcev I in H z odprtinami v stojini v vodoravnem položaju. Ta standard se uporablja za nosilce, ki so izpostavljeni ognju iz 3 ali 4 strani.
Ta standard se uporablja za protipožarne materiale, ki so že bili preskušeni in ocenjeni v skladu s standardoma EN 13381-4 ali EN13381-8. tj. standard prEN 13381-9 ne sme biti uporabljen samostojno. Uporaba standarda prEN 13381-9 zahteva multitemperaturno analizo (MTA) iz standarda EN 13381-4 ali EN 13381-8 kot osnovo za določanje debeline nosilcev z odprtinami v stojini. Analizo MTA je treba izvesti v stojini in spodnji prirobnici ter v obeh primerih ustvariti elementarno multitemperaturno analizo (EMTA). EMTA spodnje prirobnice se lahko uporabi kot EMTA zgornje prirobnice, če je nosilec izpostavljen ognju iz štirih strani.
Ta evropski standard vključuje metodologijo preskušanja požarne varnosti, ki določa preskuse, ki jih je treba opraviti za pridobitev podatkov o toplotnih lastnostih sistema protipožarnega varstva v času izpostavljenosti standardni krivulji temperatura-čas, določeni v standardu EN 1363-1.
Ta evropski standard prav tako vsebuje presojo, ki predpisuje način analiziranja podatkov preskusa, in navodila o postopkih, ki jih je treba izvesti.
Postopek ocenjevanja se uporablja za ugotavljanje:
a) toplotnega odziva požarno zaščitnega sistema na celične nosilce (toplotno delovanje) na podlagi podatkov o temperaturi, pridobljenih pri preskušanju delovanja neobremenjenih profilov;
b) toplotnega razmerja med temperaturo stojine in referenčno temperaturo stojine, ki niha glede na širino stojine;
c) temperaturnega razmerja med točkami okoli odprtin v stojini in referenčnim področjem stojine;
d) elementarne multitemperaturne analize iz standarda EN 13381-4 ali EN 13381-8, ki jo je treba znova oceniti in o njej poročati v povezavi z elementarnim A/V za vsako obdobje požarne odpornosti.
Strukturni model je treba uporabiti za določanje mejnih temperatur za celične nosilce z uporabo podatkov iz b), c) in d) zgoraj.
General Information
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.RQVWUXNFLMVNLKVWRMLQLPrüfverfahren zur Bestimmung des Beitrages zum Feuerwiderstand von tragenden Bauteilen - Teil 9: Brandschutzmaßnahmen für Stahlträger mit StegöffnungenMéthodes d'essai pour déterminer la contribution à la résistance au feu des éléments de construction - Partie 9: Systèmes de protection au feu appliqués aux poutres alvéolaires en acierTest methods for determining the contribution to the fire resistance of structural members - Part 9: Applied fire protection systems to steel beams with web openings13.220.50Požarna odpornost gradbenih materialov in elementovFire-resistance of building materials and elementsICS:Ta slovenski standard je istoveten z:EN 13381-9:2015SIST EN 13381-9:2015en,fr,de01-september-2015SIST EN 13381-9:2015SLOVENSKI
STANDARD
SIST EN 13381-9:2015
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 13381-9
June 2015 ICS 13.220.50; 91.080.10 English Version
Test methods for determining the contribution to the fire resistance of structural members - Part 9: Applied fire protection systems to steel beams with web openings
Méthodes d'essai pour déterminer la contribution à la résistance au feu des éléments de construction - Partie 9: Systèmes de protection au feu appliqués aux poutres alvéolaires en acier
Prüfverfahren zur Bestimmung des Beitrages zum Feuerwiderstand von tragenden Bauteilen - Teil 9: Brandschutzmaßnahmen für Stahlträger mit StegöffnungenThis European Standard was approved by CEN on 20 May 2015.
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-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 responsibility 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 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
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR 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 13381-9:2015 ESIST EN 13381-9:2015
EN 13381-9:2015 (E) 2 Contents Page Foreword .4 Introduction .5 1 Scope .6 2 Normative references .7 3 Terms and definitions, symbols and units .7 3.1 Terms and definitions .7 3.2 Symbols and units .9 4 Test equipment .9 4.1 General .9 4.2 Furnace .9 4.3 Test conditions .9 5 Test specimens . 10 5.1 General . 10 5.2 Precautions against erroneous results . 10 5.3 Construction of steel test specimens . 10 5.3.1 Cellular beam test sections . 10 5.3.2 Application of the fire protection material to the test sections . 10 5.4 Composition of test specimen component materials . 10 5.4.1 Steel sections . 10 5.4.2 Fire protection materials . 11 5.4.3 Fire protection thickness requirements for sprayed materials . 11 5.4.4 Selection of test specimens . 11 6 Installation of the test specimens . 13 6.1 Fixing . 13 6.2 Installation pattern . 13 6.3 Furnace Load . 13 6.4 Conditioning of the test specimens . 14 7 Application of instrumentation . 14 7.1 General . 14 7.2 Instrumentation for measurement of furnace temperature . 14 7.2.1 General . 14 7.2.2 Furnace temperature in the region of test specimens . 14 7.3 Instrumentation for measurement and determination of steel temperatures . 14 7.3.1 General . 14 7.3.2 Location of thermocouples attached to the Beams . 14 7.3.3 Location of web reference thermocouples . 14 7.4 Instrumentation for measurement of pressure . 14 8 Test procedure . 15 8.1 General . 15 8.2 Furnace temperature and pressure . 15 8.3 Temperature of steelwork . 15 8.4 Observations . 15 8.5 Termination of test. 15 9 Test results . 15 9.1 Acceptability of test results . 15 SIST EN 13381-9:2015
EN 13381-9:2015 (E) 3 9.2 Test report and presentation of test results . 16 10 Assessment . 16 10.1 General . 16 10.2 Determination of mean web post and web reference temperatures . 17 10.3 Determination of web post lines . 17 10.4 Additional thermal modification factors . 18 10.5 Determination of limiting temperature . 18 10.6 Determination of EMTA . 18 11 Report of the assessment. 19 12 Limits of the applicability of the results of the assessment . 19 Annex A (informative)
Determination of Product Thickness on Beams with Web Openings . 30 A.1 Purpose . 30 A.2 Background . 30 A.3 Overview of structural geometry . 30 A.4 Interaction with EN 13381-4 and EN 13381-8 . 32 A.5 Steel temperature distribution . 32 A.6 Structural analysis of the beam design . 32 A.7 Determination of fire protection thickness . 37 A.7.1 Product specific analysis on the basis of a specified critical temperature . 37 A.7.2 Iterative protection thickness analysis . 37 A.7.3 Iterative steel temperature analysis . 37 A.8 Structural models . 37 Annex B (informative)
The logic for determining the web post average temperature . 38 Bibliography . 40
SIST EN 13381-9:2015
EN 13381-9:2015 (E) 4 Foreword This document (EN 13381-9:2015) 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 endorsement, at the latest by December 2015, and conflicting national standards shall be withdrawn at the latest by December 2015. 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 European Commission and the European Free Trade Association. This European Standard is one of a series of standards for evaluating the contribution to the fire resistance of structural members by applied fire protection materials. Other parts of this series are: — Part 1: Horizontal protective membranes; — Part 2: Vertical protective membranes; — Part 3: Applied protection to concrete members; — Part 4: Applied passive protection to steel members; — Part 5: Applied protection to concrete/profiled sheet steel composite member; — Part 6: Applied protection to concrete filled hollow steel columns; — Part 7: Applied protection to timber members [currently at Enquiry stage]; — Part 8: Applied reactive protection to steel members. The document adopts the principle of establishing ratios of temperatures between and around openings in the web of a beam with the temperatures of a solid portion of that beam. This is with the intention that this data can be utilized within a structural model to derive the value and location of the associated limiting temperature of the beam at the fire limit state. This can then be used in conjunction with data for the fire protection material determined from either EN 13381-4 or EN 13381-8, as appropriate to determine the necessary thickness of fire protection. According to the CEN/CENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic 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. SIST EN 13381-9:2015
EN 13381-9:2015 (E) 5 Introduction The European Committee for Standardization (CEN) draws attention to the fact that it is claimed that compliance with this document may involve the use of a patent concerning the method of designing a fire resistant structural beam. CEN takes no position concerning the evidence, validity and scope of this patent right. The holder of this patent right has ensured CEN that, through appropriate declaration, he/she agrees to publically disclose the relevant part of their patent in RT1356 or EN 13381-9 and renounce to challenge the same and all subsequent European standards on the basis of infringement of their patent. In this respect, the statement of the holder of this patent right is registered with CEN. Information may be obtained from: Fabsec Limited 1st Floor Unit 3 Calder Close Calder Business Park Wakefield WF4 3BA United Kingdom Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights other than those identified above. CEN [and/or] CENELEC shall not be held responsible for identifying any or all such patent rights. CEN (http://www.cen.eu/cen/WorkArea/IPR/Pages/default.aspx) and CENELEC (http://www.cenelec.eu/membersandexperts/toolsandapplications/index.html) maintain on-line lists of patents relevant to their standards. Users are encouraged to consult the lists for the most up to date information concerning patents. Caution: The attention of all persons concerned with managing and carrying out this fire resistance test, is drawn to the fact that fire testing can be hazardous and that there is a possibility that toxic and/or harmful smoke and gases can be evolved during the test. Mechanical and operational hazards can also arise during the construction of test elements or structures, their testing and the disposal of test residues. An assessment of all potential hazards and risks to health should be made and safety precautions should be identified and provided. Written safety instructions should be issued. Appropriate training should be given to relevant personnel. Laboratory personnel should ensure that they follow written safety instructions at all times. The specific health and safety instructions contained within this standard should be followed. SIST EN 13381-9:2015
EN 13381-9:2015 (E) 6 1 Scope This European Standard specifies a test and assessment method for determining the contribution made by fire protection systems to the fire resistance of structural steel beam I and H members in the horizontal plane containing openings in the web which may affect the structural performance of the beam. This European Standard applies to beams subject to 3 or 4 sided fire exposure. For any beam with a single web opening or where the web openings are considered to be of small diameter in relation to the web depth the applicability of this European Standard needs to be determined by a structural engineer. This European Standard applies to fire protection materials that have already been tested and assessed in accordance with EN 13381-4 or EN 13381-8. i.e. this European Standard cannot be used in isolation. Use of this European Standard requires the multi-temperature analysis (MTA) derived from EN 13381-4 or EN 13381-8 as the basis for determining thickness for beams with web openings. This MTA needs to be carried out on the web and bottom flange separately generating an elemental multi-temperature analysis (EMTA). The bottom flange EMTA may be used as the top flange EMTA when a beam is subject to 4 sided exposure. This European Standard contains the fire test methodology, which specifies the tests which need to be carried out to provide data on the thermal characteristics of the fire protection system, when exposed to the standard temperature/time curve specified in EN 1363-1. This European standard also contains the assessment, which prescribes how the analysis of the test data should be made and gives guidance on the procedures which should be undertaken. The assessment procedure is used to establish: a)
on the basis of the temperature data derived from testing unloaded steel sections, the thermal response of the fire protection system on cellular beams (the thermal performance); b) the temperature ratio between the web post and the web reference temperature, which will vary depending on the web post width; c) the temperature ratio between points around the web openings and the web reference area; d) the elemental multi temperature analysis from either EN 13381-4 or EN 13381-8 needs to be reassessed and reported against elemental A/V for each fire resistance period; e) a structural model needs to be used to derive limiting temperatures for cellular beams using the data from b), c) and d) above. SIST EN 13381-9:2015
EN 13381-9:2015 (E) 7 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 (including any amendments) applies. EN 1363-1, Fire resistance tests - Part 1: General Requirements EN 1993-1-1, Eurocode 3: Design of steel structures - Part 1-1: General rules and rules for buildings EN 1993-1-2, Eurocode 3: Design of steel structures - Part 1-2: General rules - Structural fire design EN 1994-1-1, Eurocode 4: Design of composite steel and concrete structures - Part 1-1: General rules and rules for buildings EN 1994-1-2, Eurocode 4 - Design of composite steel and concrete structures - Part 1-2: General rules - Structural fire design EN 10025-1, Hot rolled products of structural steels - Part 1: General technical delivery conditions EN 13381-4:2013, Test methods for determining the contribution to the fire resistance of structural members - Part 4: Applied passive protection to steel members EN 13381-8:2013, Test methods for determining the contribution to the fire resistance of structural members - Part 8: Applied reactive protection to steel members EN ISO 13943, Fire safety - Vocabulary (ISO 13943) EN ISO 15614-1, Specification and qualification of welding procedures for metallic materials - Welding procedure test - Part 1: Arc and gas welding of steels and arc welding of nickel and nickel alloys (ISO 15614-1) ISO 8421-2, Fire protection — Vocabulary — Part 2: Structural fire protection 3 Terms and definitions, symbols and units 3.1 Terms and definitions For the purposes of this document, the terms and definitions given in EN 1363-1, EN ISO 13943 and ISO 8421-2, and the following apply. 3.1.1 cellular beam(s) structural steel beams with web opening(s) 3.1.2 fire protection material
3.1.2.1 reactive materials materials that are specifically formulated to provide a chemical reaction upon heating such that their physical form changes and in so doing provide fire protection by thermal insulative and cooling effects SIST EN 13381-9:2015
EN 13381-9:2015 (E) 8 3.1.2.2 passive materials materials that do not change their physical form on heating, providing protection by virtue of their physical or thermal properties Note 1 to entry: They may include materials containing water which, on heating evaporates to produce cooling effects. These may take the form of sprayed coatings, renderings, mat products boards or slabs. 3.1.3 fire protection system fire protection material together with any supporting system including mesh reinforcement as tested 3.1.4 test specimen steel test section plus the fire protection system under test 3.1.5 fire protection thickness total dry film thickness of the fire protection material 3.1.6 stickability ability of a fire protection material to remain sufficiently coherent and in position for a well defined range of deformations, furnace and steel temperatures, such that its ability to provide fire protection is not significantly impaired 3.1.7 bottom flange temperature bottom flange temperature is the overall average of the bottom flange 3.1.8 web post area of web between two web openings 3.1.9 web post temperature proportioned average temperature of the web post derived from thermocouples fixed across the web at mid-height 3.1.10 web reference temperature mean temperature of a solid portion of the web without holes in close proximity, that is at least 250 mm from the edge of a hole 3.1.11 web post buckling web post buckling occurs when the web separating two openings is unable to transfer the required horizontal shear force and the shear stress is greater than the shear strength of the web 3.1.12 vierendeel bending mechanism by which shear is transferred across the web opening and causes bending in the top and bottom, left and right, parts of the beam surrounding the opening 3.1.13 limiting temperature temperature at a point along the beam at which structural failure of the cellular beam will take place SIST EN 13381-9:2015
EN 13381-9:2015 (E) 9 3.1.14 elemental section factor section factor of the web or bottom flange in isolation 3.1.15 plate girder dimensions plate girder size which is stated as overall beam depth by flange width by flange thickness by web thickness given in millimetres 3.1.16 multi temperature analysis outcome of an assessment carried out in accordance with either EN 13381-4 or EN 13381-8 based on a range of average temperatures of the whole steel section 3.1.17 elemental multi temperature analysis outcome of an assessment carried out on data from EN 13381-4 or EN 13381-8 based on a range of average temperatures of the web and flanges separately 3.2 Symbols and units Symbol Unit Designation B
m Width of beam flanges D
m Depth of beam tw
m Thickness of web tf
m Thickness of flanges 4 Test equipment 4.1 General The furnace and test equipment shall conform to that specified in EN 1363-1. 4.2 Furnace The furnace shall be designed to permit the dimensions of the test specimens to be exposed to heating, to be as specified in 6.2 and their installation within the test furnace to be as specified in Clause 6. 4.3 Test conditions A number of short steel beams all containing web openings and protected by the fire protection system shall be heated in a furnace according to the protocol given in EN 1363-1 and Clause 7. Where several test specimens are tested simultaneously, care shall be taken that each is adequately and similarly exposed to the specified test conditions. The procedures given in EN 1363-1 shall be followed in the performance of this test unless specific contrary instructions are given. SIST EN 13381-9:2015
EN 13381-9:2015 (E) 10 5 Test specimens 5.1 General The test sections should be chosen to suit the scope of the assessment. There are specific test packages designed to suit a specified fire performance period as given in 5.4.4, Tables 1, 2, and 3. 5.2 Precautions against erroneous results In the event that there should be a loss of valid results from the package of short steel sections tested, (through failure of thermocouples, abnormal behaviour of fire protection, etc), then the conditions given in 9.1 shall be applied and a further number of short steel sections may be required to be tested. 5.3 Construction of steel test specimens 5.3.1 Cellular beam test sections The beam sections shall be fabricated from welded steel plate to ensure that flange and web steel thicknesses are consistent, however the thermal data may be applied to both steel plate and hot rolled section. In each case the welding techniques shall be in accordance with EN ISO 15614-1. The short beams shall have a length of (1 200 ± 50) mm and will have circular or rectangular openings cut out of the webs. The short beams shall be constructed according to Figures 1, 2 and 3. To minimize heat transfer at the ends of the beams, the ends shall be protected with insulation board or similar which at elevated temperatures is capable of providing equivalent or greater insulation than that of the fire protection material provided over the length of the test specimen, (see Figure 4). The linear dimensions of the end protection shall be greater than the total overall dimensions measured over the fire protected steel member. 5.3.2 Application of the fire protection material to the test sections The surface of the steel shall be prepared in accordance with the manufacturers recommendations and the fire protection system shall be applied to the beams in a manner representative of practice. 5.4 Composition of test specimen component materials 5.4.1 Steel sections The grade of steel used shall be any structural grade (S designation) to EN 10025-1 (excluding S 185). Engineering grades (E designation) shall not be used. The dimensions of the steel sections shall be measured and these values shall be used to determine the elemental section factors. The elemental section factors shall be calculated in accordance with Figure 7. All the steel sections shall be fabricated from steel plate to ensure a consistent approach in determining the thermal data. SIST EN 13381-9:2015
EN 13381-9:2015 (E) 11 5.4.2 Fire protection materials The composition, dimensions, (including thickness), verification and properties of the fire protection materials shall be determined in accordance with the requirements of EN 13381-4 or EN 13381-8. The thickness of panel or board type fire protection materials should not deviate by more than 15 % of the mean value over the whole of its surface. The mean value shall be used in the assessment of the results and in the limits of applicability of the assessment. If it deviates by more than 15 % then the maximum thickness recorded shall be used in the assessment. The thickness of fire protection material applied to the inside edge of an opening may be less than the thickness tested on the main body beams in the test packages in 5.4.4 provided it is not less than the minimum tested on a loaded beam in EN 13381-4 or EN 13381-8 and that it is the same material. Other materials or combinations of may not be used unless alternative fire test evidence is available that is not covered by this European Standard. 5.4.3 Fire protection thickness requirements for sprayed materials Thickness measurements shall be evenly distributed and shall be taken in order to provide an overall mean for each section, each
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