SIST EN 15254-7:2012
(Main)Extended application of results from fire resistance tests - Non-loadbearing ceilings — Part 7: Metal sandwich panel construction
Extended application of results from fire resistance tests - Non-loadbearing ceilings — Part 7: Metal sandwich panel construction
This European Standard defines rules for extended applications, provides guidance, and where appropriate defines procedures, for variations of certain parameters and factors associated with the design of internal nonloadbearing ceilings constructed of metal sandwich panels that have been tested in accordance with EN 1364-2. This European Standard applies to self-supporting, double skin metal faced sandwich panels having an insulating core bonded to both facings.
Erweiterter Anwendungsbereich der Ergebnisse von Feuerwiderstandsprüfungen - Nichttragende Unterdecken - Teil 7: Sandwichelemente in Metallbauweise
Diese Europäische Norm legt Regeln für erweiterte Anwendungsbereiche fest, enthält Leitlinien, und definiert, falls erforderlich, Verfahren zur Änderung von bestimmten Parametern und Faktoren, die mit der Bauweise von nichttragenden Innendecken aus Sandwichelementen in Metallbauweise, die nach EN 1364-2 geprüft wurden, zusammenhängen. Diese Europäische Norm gilt für selbsttragende Sandwichelemente mit beidseitigen Metalldeckschichten und einem Kern aus Wärmedämmstoff, der auf beiden Seiten verklebt ist.
Application étendue des résultats d´essais de résistance au feu - Plafonds non porteurs Panneaux sandwiches métalliques pour la construction - Partie 7 : Panneaux sandwiches métalliques pour la construction
La présente Norme européenne définit des règles pour des applications étendues, fournit des lignes
directrices et, le cas échéant, définit des modes opératoires, pour les variations de certains paramètres et
facteurs associés à la conception de plafonds intérieurs non porteurs constitués de panneaux sandwich
métalliques et soumis à essai conformément à l'EN 1364-2.
La présente Norme européenne s'applique aux panneaux sandwich autoportants double peau à parements
métalliques ayant une âme isolante collées aux deux parements.
Razširjena uporaba rezultatov preskusov požarne odpornosti - Nenosilne stene - 7. del: Stene iz kovinskih sendvič panelov
Ta evropski standard določa pravila za razširjeno uporabo, zagotavlja navodila in po potrebi določa postopke za odstopanja nekaterih parametrov in faktorjev, povezanih z obliko notranjih nenosilnih sten, zgrajenih iz kovinskih sendvič panelov, preskušenih v skladu s standardom EN 1364-2. Ta evropski standard velja za samonosilne dvoslojne kovinske sendvič panele z izoliranim jedrom, vezanim na obe strani.
General Information
Relations
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Erweiterter Anwendungsbereich der Ergebnisse von Feuerwiderstandsprüfungen - Nichttragende Unterdecken - Teil 7: Sandwichelemente in MetallbauweiseApplication étendue des résultats d´essais de résistance au feu - Plafonds non porteurs
Panneaux sandwiches métalliques pour la construction - Partie 7 : Panneaux sandwiches métalliques pour la constructionExtended application of results from fire resistance tests - Non-loadbearing ceilings — Part 7: Metal sandwich panel construction91.060.10Stene. Predelne stene. FasadeWalls. Partitions. Facades13.220.50Požarna odpornost gradbenih materialov in elementovFire-resistance of building materials and elementsICS:Ta slovenski standard je istoveten z:EN 15254-7:2012SIST EN 15254-7:2012en,fr,de01-november-2012SIST EN 15254-7:2012SLOVENSKI
STANDARD
SIST EN 15254-7:2012
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 15254-7
June 2012 ICS 13.220.50; 91.060.30 English Version
Extended application of results from fire resistance tests - Non-loadbearing ceilings - Part 7: Metal sandwich panel construction Application étendue des résultats d´essais de résistance au feu - Plafonds non porteurs - Partie 7: Panneaux sandwiches métalliques pour la construction
Erweiterter Anwendungsbereich der Ergebnisse von Feuerwiderstandsprüfungen - Nichttragende Unterdecken -Teil 7: Sandwichelemente in Metallbauweise This European Standard was approved by CEN on 4 May 2012.
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, 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
Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 15254-7:2012: ESIST EN 15254-7:2012
EN 15254-7:2012 (E) 2 Contents Page Foreword .31 Scope .42 Normative references .43 Terms, definitions, symbols and abbreviations .43.1 Terms and definitions .43.2 Symbols and abbreviations .54 Establishing the field of extended application .64.1 General .64.2 Assumptions in the extended application .64.3 Assumed structural behaviour of a sandwich panel in fire .75 Rules for extended applications of the tested product .75.1 General .75.2 Variations in the materials of the product .85.2.1 General .85.2.2 Variations in the metal sheets .85.2.3 Variations in the adhesive .95.2.4 Variations in the core material . 105.3 Variations in the construction . 115.3.1 Variations in span length . 115.3.2 Variations in the panel thickness . 115.3.3 Variations in the joint construction . 125.3.4 Variations in the boundary conditions and fixing system . 125.3.5 Length and width of ceiling construction . 125.4 Interaction between the factor influences . 125.5 Support structure. 135.6 Heating conditions. 136 Small scale tests and calculation methods . 136.1 Small scale tests . 136.2 Calculation methods . 146.2.1 General . 146.2.2 Calculation of strength properties . 146.3 Additional measurements to be carried out in the reference test . 147 Report of the extended application analysis . 14Annex A (informative) Typical behaviour of a sandwich panel ceiling when exposed to fire . 16Annex B (normative) Typical examples of sandwich panel ceiling end fixings to support structure . 18Annex C (normative) Rules and calculation methods for extending the span length of sandwich panel ceilings . 19 Bibliography . 22 SIST EN 15254-7:2012
EN 15254-7:2012 (E) 3 Foreword This document (EN 15254-7:2012) 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 2012, and conflicting national standards shall be withdrawn at the latest by December 2012. 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. EN 15254 is divided into the following parts: EN 15254-2, Extended application of results from fire resistance tests — Non-loadbearing walls — Part 2: Masonry and Gypsum Blocks EN 15254-4, Extended application of results from fire resistance tests — Non-loadbearing walls — Part 4: Glazed constructions EN 15254-5, Extended application of results from fire resistance tests — Non-loadbearing walls — Part 5: Metal sandwich panel construction prEN 15254-6, Extended application of results from fire resistance tests — Non-loadbearing walls — Part 6: Curtain walling EN 15254-7, Extended application of results from fire resistance tests — Non-loadbearing ceilings — Part 7: Metal sandwich panel construction, [the present 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, Turkey and the United Kingdom.
SIST EN 15254-7:2012
EN 15254-7:2012 (E) 4 1 Scope This European Standard defines rules for extended applications, provides guidance, and, where appropriate, specifies procedures, for variations of certain parameters and factors associated with the design of internal non-loadbearing ceilings constructed of metal sandwich panels that have been tested in accordance with
EN 1364-2. This European Standard applies to self-supporting, double skin metal faced sandwich panels which have an insulating core bonded to both facings. 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 1363-1:2012, Fire resistance tests — Part 1: General requirements EN 1363-2, Fire resistance tests — Part 2: Alternative and additional procedures EN 1364-2:1999, Fire resistance tests for non-loadbearing elements — Part 2: Ceilings EN 1993-1-2, Eurocode 3. Design of steel structures — Part 1-2: General rules — Structural fire design EN 13501-2, Fire classification of construction products and building elements — Part 2: Classification using data from fire resistance tests, excluding ventilation services EN 14509:2006, Self-supporting double skin metal faced insulating panels — Factory made products — Specifications 3 Terms, definitions, symbols and abbreviations 3.1 Terms and definitions For the purpose of this document, the terms and definitions given in EN 14509:2006, EN 1364-2:1999, EN 1363-1:2012 and the following apply.
3.1.1 direct field of application of test results outcome of a process (involving the application of defined rules) whereby a test result is deemed to be equally valid for variations in one or more of the product properties and/or intended end use applications 3.1.2 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 application(s), a test result on the basis of one or more test results to the same test standard 3.1.3 factor one of the possible variations that may be applied to a parameter SIST EN 15254-7:2012
EN 15254-7:2012 (E) 5 3.1.4 factor influence one of the potential causes of a change in the fire resistance due to a factor 3.1.5 fastening, fixing device that fastens the panels to a support structure or to the test frame 3.1.6 fixing system system consisting of fastenings and other possible means used to fasten the panels to a support structure or to the test frame 3.1.7 length of assembly length of the ceiling in the span (or panel length) direction in the reference test or in the end use application 3.1.8 width of assembly width of the ceiling in the cross direction of the span (or panel length) in the reference test or in the end use application 3.1.9 reference test fire resistance test on which the extended application is based and the results of which are used as the main source of data for the extended application Note 1 to entry: The fire resistance test is in accordance with EN 1363-1 and EN 1364-2 and where applicable EN 1363-2. 3.1.10 stiching device for fixing panels to panels in the longitudinal joint 3.1.11 span length center to center distance between two consecutive supports to which the sandwich panel is fixed 3.1.12 support structure construction onto which the panel ceiling is fastened in the end use application 3.1.13 test frame frame containing the test construction for the purpose of mounting onto the furnace 3.2 Symbols and abbreviations For the purposes of this document, the following symbols and abbreviations apply. FEd
catenary force acting on the fasteners
Fv
vertical force due at g acting at the fastener FEd1
catenary force acting at the fastener at maximum temperature in the test
FEd2
catenary force acting at the fastener at temperature for the increased span
Fv1
vertical force due at g acting at the fastener at maximum temperature in the test
SIST EN 15254-7:2012
EN 15254-7:2012 (E) 6 Fv2
vertical force due at g acting at the fastener at temperature for the increased span
L
span length
T
temperature b
width of panel g
panel weight per square meter n
number of fasteners p
relative end movement in the fastener w
deflection of the ceiling α
linear coefficient of thermal expansion 4 Establishing the field of extended application 4.1 General An extended application analysis is required when the application differs in one or more parameters from the one tested and described in the test report and/or in the classification document, and which is not covered by the field of direct application of the classification document. The extended application of the sandwich panels used as a non-loadbearing ceiling shall be based on the reference fire test results performed according to EN 1364-2. It may be complemented by one or more additional small or full-scale tests or by historical data. If historical data are used, they shall comply with the rules given in this document. 4.2 Assumptions in the extended application The following assumptions are considered when evaluating extended applications for sandwich panels: a) the ceiling is required to possess fire resistance in the end-use condition (relevant classes are given in EN 13501-2);
b) the ceiling is assumed to be exposed on the entire face of one side (either from above or below) to the standardised heating conditions given in the EN 1363-1 fire resistance test specification; c) the structure to which the ceiling is fixed does not deflect during the fire exposure period; this simulates the non-deflecting nature of the test frame which forms part of the furnace test apparatus; NOTE In reality constructions deflect and this fact should be taken into account when designing the building and planning the constructional details. d) after delamination of the fire exposed facing, the dead load of the panels is carried by a support structure to which the ends of the sandwich panels are attached; the forces from the dead load will be distributed to the support structure by the panel fixings from which loadbearing capacity shall be evaluated; e) the support structure has at least the same loadbearing capacity, R, of the resistance to fire performance as the sandwich panel ceiling regarding integrity; f) the self weight of the facing and core is calculated from the volume and density of the materials; SIST EN 15254-7:2012
EN 15254-7:2012 (E) 7 g) the calculation of the reduction in the strength properties of steel at elevated temperature shall be in accordance with EN 1993-1-2. 4.3 Assumed structural behaviour of a sandwich panel in fire When one face of a sandwich panel assembly is exposed to fire, the following behaviour may be expected. Delamination of the fire-exposed face will occur after a couple of minutes in a fire. After delamination, the flexural strength of the assembly is lost and, unless both faces are restrained at the ends, the panels can collapse. The fastenings for the ends of the panels need to support the dead load of the whole panel for the entire fire resistance period. The behaviour slightly differs depending on the direction of the fire (from above or below). In both cases, the structure acts as a catenary construction.
NOTE Annex A illustrates typical behaviour of panels. 5 Rules for extended applications of the tested product 5.1 General When performing extended applications for a tested ceiling, changes can occur either in the materials and/or in the construction. Both are dealt with in this standard. Table 1 and Table 2 list the changes which may or may not be made in an extended application assessment. The rules for the changes are either given in Table 1 or Table 2 or in 5.2 and 5.3. Table 1 — Material changes relevant to extended application Parameter Factors Factor influence on performance Rules Integrity E Insulation I Changes in metal facings Chemical composition of coating influence
no influence a
5.2.2.1 Change from coated to non-coated metal no influence influence 5.2.2.1 Sheet thickness influence no influence a Valid up to + 50 % of tested nominal thickness but no decrease is allowed for thicknesses below 0.5 mm and fixing capacity shall be checked Change from one metal to another influence influence 5.2.2.2 Change in sheet geometry influence influence 5.2.2.3 Changes in adhesive Amount
influence influence 5.2.3 Type influence
no influence a 5.2.3 Changes in core material Type major influence major influence 5.2.4 Change in composition
major influence
major influence
5.2.4.2 - 5.2.4.7 a It is understood that when a change in a factor can influence the integrity of a joint, there is a possibility that a change in leakage of hot gases or in joint geometry can also influence the temperature rise near the joint and therefore influence the insulation rating. SIST EN 15254-7:2012
EN 15254-7:2012 (E) 8 Table 2 — Constructional changes relevant to extended application Parameter Factors Factor influence on performance Rules Integrity E Insulation I Span length Decrease no influence no influence
Allowed Increase influence
no influence a 5.3.1 Panel width Decrease no influence no influence Allowed Increase influence
no influence a Test results valid up to + 20 % Panel thickness e.g. core thickness Decrease/increase influence major influence 5.3.2 Joint construction Type major influence
major influence
5.3.3 Stiching decreased influence
influence Not allowed Stiching increased influence
influence 5.3.3 Sealants influence influence 5.3.3 Fixing system Type major influence
no influence a 5.3.4 Amount decreased major influence
no influence a 5.3.4 Amount increased influence
no influence a Allowed Protection decreased major influence
influence
5.3.4 Protection increased influence
influence
Allowed Length of assembly Decrease no influence no influence 5.3.5 Increase influence no influence a 5.3.5 Width of assembly Decrease no influence no influence 5.3.5 Increase no influence no influence 5.3.5 Support structure Changes influence no influence a 5.5 a It is understood that when a change in a factor can influence the integrity of a joint, there is a possibility that a change in leakage of hot gases or in joint geometry can also influence the temperature rise near the joint and therefore influence the insulation rating.
5.2 Variations in the materials of the product 5.2.1 General Sandwich panels consist of three main materials: facing metal sheets, adhesive and core material. In the case of auto-adhesively bonded panels, the foamed core material also forms the adhesive layer during the foaming process.
Changes in the components of a panel can have influences on the fire resistance. The rules in Clause 5 apply to such changes. 5.2.2 Variations in the metal sheets 5.2.2.1 Variations in the coatings The most essential property of the coating with regard to fire resistance is the emissivity on the non-exposed side. Normally the emissivity for a coated steel sheet is between 0,8 and 0,95. A change in emissivity of -10 % for a new coating compared to the tested one is thus allowed if there is at least a 10 % margin in the insulation SIST EN 15254-7:2012
EN 15254-7:2012 (E) 9 test result compared to the I-classification. Test results are always valid for coatings with higher emissivity values compared to the tested one. When a change in coating is made, the manufacturer of the coated sheet shall provide emissivity properties for the products. A non-coated metal sheet can have an emissivity as low as 0,1. A change from a coated to a non-coated sheet is therefore not allowed. The same rule specified above for coatings applies also in this case. A decrease in emissivity of 10 % is allowed if the emissivities of the different sheets are known. For changes in emissivity >10 %, surface temperatures can be estimated from small-scale tests in accordance with 6.1 where the surface temperatures of the new panel are compared to the one tested in the reference scenario. If appropriate calculation methods are available, the surface temperatures can also be calculated and compared, provided that temperature-dependent thermal resistance values for the core material are available. The energy content of the coating on the exposed side is small and will not affect the fire resistance properties of the sandwich panel. Test results are valid for all coatings. If modifications in the coatings on the non-exposed side are made, compared to the tested one, the ignitability of the modified coating shall be higher or equal to that tested. This can be checked by conducting small-scale tests according to 6.1. Test results are valid for all colours of the same type of coating. 5.2.2.2 Variations in the metal material The following rules are valid for extended applications. 1) The test results are valid for all grades of tested normal steel, and if once tested as stainless steel for all grades of stainless steel. (A change from mild steel to stainless steel is not possible without conducting further tests.) 2) For other types of metals, the test result is valid for tested type only. 3) For panels with perforated facings on one or both sides of the panels, a test result achieved with a perforated facing is always valid for non-perforated facings in the same position as in the tested product. Test results for a product tested with non-perforated facings are valid only for a product with perforated facings on the fire exposed side where the perforation area is not greater than 25 % and where the reaction to fire class of the core material is A2-s1, d0 or better. Other changes are not allowed. 5.2.2.3 Changes in profile geometry of facing The following rules are valid for extended applications. 1) For flat or small profiling (between 0 mm and 5 mm): test results are valid for any change. 2) For profiles greater than 5 mm: test results are valid for variations + 50 % of profile depth. 5.2.3 Variations in the adhesive This paragraph is valid only for panels with adhesively bonded cores. The following rules apply for an adhesive with no strength at high temperatures (> 500 oC) which means that the metal sheet on the exposed side will disconnect from the core in the very beginning of a fire and the construction will loose its sandwich capability. For this reason, an organic adhesive cannot be changed to a non-organic one or vice versa.
Normally the energy content of the adhesive is small and will not affect the fire resistance properties of the sandwich panel. The following rules are valid for extended applications. 1) For gross calorific potential PCS value 0 MJ/m2 to 4 MJ/m2: the results are valid for all adhesives when gross calorific potential PCS value stays between 0 MJ/m2 and 4 MJ/m2. SIST EN 15254-7:2012
EN 15254-7:2012 (E) 10 2) For gross calorific potential PCS value > 4 MJ/m2:.the results are valid for gross calorific potential PCS values lower than the tested adhesive within manufacturing tolerances. 3) For gross calorific potential PCS value > 4 MJ/m2 and > 1,15*PCS: test results shall be reduced by the same % as the gross calorific potential PCS value is over the initial tested adhesive. 5.2.4 Variations in the core material 5.2.4.1 General The following main core materials are used in sandwich panels: mineral wool (MW), polyurethane (PUR), extruded polystyrene (XPS), expanded polystyrene (EPS), phenolic foam and cellular glass. The behaviour of these core materials regarding fire is different and cannot be compared. Changes from one core material to another are therefore not allowed in any extended application. Variations within each core material group are allowed in accordance with the rules given in 5.2.4.2 to 5.2.4.7. There are several factors in the different core materials that affect the fire properties of the core and of the sandwich panel. It is therefore not possible to extend the results from one core material producer to be valid for apparently similar materials from another producer. 5.2.4.2 Mineral wool (MW)
Mineral wool consists of stone wool and glass wool. Generally, the greater the density of the mineral wool the higher the flexural strength of the panel. Density will be dictated by room-temperature structural design requirements. However, variation in density affects the I-insulation value. The results are always valid for an increase in density in the density range 50 kg/m3 to 150 kg/m3. A decrease in density is allowed down to -10 % of tested density. Structural design will govern the orientation of fibres i.e. lamellas or slabs used in the panels. Changes in orientation of fibre have an influence on fire resistance and are therefore not allowed. Gaps between the lamellas or ends of lamellas should be avoided. Test results are valid for panels with a decrease in the number of lamella joints. The mass of fibre binder used per unit volume of MW is governed by room-temperature structural design. Because variations in binder content can affect the fire resistance properties, the following rules shall be followed:
1) A smaller amount of binder is always allowed compared to the tested one. 2) An increase in binder content of 2 % is allowed if the total amount of binder is below 10 %. For example, a result with 4 % binder is valid also for a core with 6 %. An increase is not allowed where the binder content is greater than 10 %. The nature and proportions of materials used to manufacture the MW fibres shall not be different from those used in the reference test. Changes from one manufacturer to another are therefore not allowed. It is also important to note that test results for stone wool panels may never be used for glass wool panels and vice versa.
5.2.4.3 Polyurethane (PUR) The test results are valid for the same chemical system and blowing agent. The test results are valid for + 10 % of tested density. SIST EN 15254-7:2012
EN 15254-7:2012 (E) 11 5.2.4.4 Extruded polystyrene (XPS) and expanded polystyrene (EPS) Small changes in chemical composition can have a great influence on the test results. The results therefore shall only be used for the tested panels. No extended application is allowed. 5.2.4.5 Phenolic foam
The test results are valid for the same chemical system and blowing agent. The test results are valid for + 10 % of tested density. 5.2.4.6 Cellular glass Small changes in chemical composition can have a great influence on the test results. The results therefore shall only be used for the tested panels. No extended application is allowed.
5.3 Variations in the construction 5.3.1 Variations in span length Two aspects of fire integrity shall be assessed. The first aspect shall be the ability of the whole panel assembly to resist collapse when the adhesive bond fails on the exposed side and the panels lose their flexural strength. To resist collapse, the ends of the panel facings shall be secured to the structure (the imaginary fire test frame in the extended application) using suspension details. Properly designed ceilings shall have both facings mechanically fastened (see typical solutions in Annex B) so they cannot collapse before the support structure collapses (see 5.5). The strength of these suspension details (e.g. steel cleats with fastenings) shall be able to carry the dead loads at the temperatures they attain from an increased load of a longer span panel. This can be achieved by increasing the amount of fixings based on the rules and calculation method
...
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Erweiterter Anwendungsbereich der Ergebnisse von Feuerwiderstandsprüfungen - Nichttragende Unterdecken - Teil 7: Sandwichelemente in MetallbauweiseApplication étendue des résultats d´essais de résistance au feu - Plafonds non porteurs
Panneaux sandwiches métalliques pour la construction - Partie 7 : Panneaux sandwiches métalliques pour la constructionExtended application of results from fire resistance tests - Non-loadbearing ceilings — Part 7: Metal sandwich panel construction91.060.30Stropi. Tla. StopniceCeilings. Floors. Stairs13.220.50Požarna odpornost gradbenih materialov in elementovFire-resistance of building materials and elementsICS:Ta slovenski standard je istoveten z:FprEN 15254-7kSIST FprEN 15254-7:2012en,fr,de01-januar-2012kSIST FprEN 15254-7:2012SLOVENSKI
STANDARD
kSIST FprEN 15254-7:2012
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
FINAL DRAFT
FprEN 15254-7
November 2011 ICS 13.220.50; 91.060.30 English Version
Extended application of results from fire resistance tests - Non-loadbearing ceilings - Part 7: Metal sandwich panel construction Application étendue des résultats d´essais de résistance au feu - Plafonds non porteurs
Panneaux sandwiches métalliques pour la construction - Partie 7 : Panneaux sandwiches métalliques pour la construction
Erweiterter Anwendungsbereich der Ergebnisse von Feuerwiderstandsprüfungen - Nichttragende Unterdecken -Teil 7: Sandwichelemente in Metallbauweise This draft European Standard is submitted to CEN members for unique acceptance procedure. It has been drawn up by the Technical Committee CEN/TC 127.
If this draft becomes a European Standard, 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.
This draft European Standard was established by CEN 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2011 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. FprEN 15254-7:2011: EkSIST FprEN 15254-7:2012
FprEN 15254-7:2011 (E) 2 Contents Page Foreword .31 Scope .42 Normative references .43 Terms, definitions, symbols and abbreviations .43.1 Terms and definitions .43.2 Symbols and abbreviations .54 Establishing the field of extended application .64.1 General .64.2 Assumptions in the extended application .64.3 Assumed structural behaviour of a sandwich panel in fire .75 Rules for extended applications of the tested product .75.1 General .75.2 Variations in the materials of the product .85.2.1 General .85.2.2 Variations in the metal sheets .85.2.3 Variations in the adhesive .95.2.4 Variations in the core material . 105.3 Variations in the construction . 115.3.1 Variations in span length . 115.3.2 Variations in the panel thickness . 115.3.3 Variations in the joint construction . 115.3.4 Variations in the boundary conditions and fixing system . 125.3.5 Length and width of ceiling construction . 125.4 Interaction between the factor influences . 125.5 Support structure. 125.6 Heating conditions. 136 Small scale tests and calculation methods . 136.1 Small scale tests . 136.2 Calculation methods . 146.2.1 General . 146.2.2 Calculation of strength properties . 146.3 Additional measurements to be carried out in the reference test . 147 Report of the extended application analysis . 14Annex A (informative)
Typical behaviour of a sandwich panel ceiling when exposed to fire . 16Annex B (normative)
Typical examples of sandwich panel ceiling end fixings to support structure . 18Annex C (normative)
Rules and calculation methods for extending the span length of sandwich panel ceilings . 19Bibliography . 22 kSIST FprEN 15254-7:2012
FprEN 15254-7:2011 (E) 3 Foreword This document (FprEN 15254-7:2011) has been prepared by Technical Committee CEN/TC 127 “Fire safety in buildings”, the secretariat of which is held by BSI. This document is currently submitted to the Unique Acceptance Procedure. 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 89/106/EEC.
kSIST FprEN 15254-7:2012
FprEN 15254-7:2011 (E) 4 1 Scope This European Standard defines rules for extended applications, provides guidance, and where appropriate defines procedures, for variations of certain parameters and factors associated with the design of internal non-loadbearing ceilings constructed of metal sandwich panels that have been tested in accordance with
EN 1364-2. This European Standard applies to self-supporting, double skin metal faced sandwich panels having an insulating core bonded to both facings. 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 amendment) applies. EN 1363-1:1999, Fire resistance tests — Part 1: General requirements EN 1363-2, Fire resistance tests — Part 2: Alternative and additional procedures EN 1364-2:1999, Fire resistance tests for non-loadbearing elements — Part 2: Ceilings EN 1993-1-2, Eurocode 3. Design of steel structures — Part 1-2: General rules — Structural fire design EN 13501-2, Fire classification of construction products and building elements — Part 2: Classification using data from fire resistance tests, excluding ventilation services EN 14509:2006, Self-supporting double skin metal faced insulating panels — Factory made products — Specifications 3 Terms, definitions, symbols and abbreviations 3.1 Terms and definitions For the purpose of this document, the terms and definitions given in EN 14509:2006, EN 1364-2:1999 and EN 1363-1:1999 together with the following apply.
3.1.1 direct field of application of test results outcome of a process (involving the application of defined rules) whereby a test result is deemed to be equally valid for variations in one or more of the product properties and/or intended end use applications 3.1.2 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 application(s), a test result on the basis of one or more test results to the same test standard 3.1.3 factor one of the possible variations that may be applied to a parameter kSIST FprEN 15254-7:2012
FprEN 15254-7:2011 (E) 5 3.1.4 factor influence one of the potential causes of a change in the fire resistance due to a factor 3.1.5 fastening, fixing device that fastens the panels to a support structure or to the test frame 3.1.6 fixing system system consisting of fastenings and possible other means to fasten the panels to a support structure or to the test frame 3.1.7 length of assembly length of the ceiling in the span (or panel length) direction in the reference test or in the end use application 3.1.8 width of assembly width of the ceiling in the cross direction of the span (or panel length) in the reference test or in the end use application 3.1.9 reference test fire resistance test in accordance with EN 1363-1 and EN 1364-2, and where applicable EN 1363-2, on which the extended application is based and the results of which are used as the main source of data for the extended application 3.1.10 stiching device for fixing panels to panels in the longitudinal joint 3.1.11 span length center to center distance between two consecutive supports to which the sandwich panel is fixed 3.1.12 support structure construction onto which the panel ceiling is fastened in the end use application 3.1.13 test frame frame containing the test construction for the purpose of mounting onto the furnace 3.2 Symbols and abbreviations For the purposes of this document, the following symbols and abbreviations apply. FEd catenary force acting on the fasteners
Fv vertical force due at g acting at the fastener FEd1 catenary force acting at the fastener at maximum temperature in the test
FEd2 catenary force acting at the fastener at temperature for the increased span
Fv1
vertical force due at g acting at the fastener at maximum temperature in the test
kSIST FprEN 15254-7:2012
FprEN 15254-7:2011 (E) 6 Fv2
vertical force due at g acting at the fastener at temperature for the increased span
L span length
T temperature b width of panel g panel weight per square meter n number of fasteners p relative en movement in the fastener w deflection of the ceiling α linear coefficient of thermal expansion 4 Establishing the field of extended application 4.1 General An extended application analysis is required when the application differs in one or more parameters from the tested one described in the test report and/or in the classification document, and which is not covered by the field of direct application of the classification document. The extended application of the sandwich panels used as a non-loadbearing ceiling shall be based on the reference fire test results performed according to EN 1364-2 and may be complemented by one or more additional small or full scale tests or by historical data. If historical data are used they shall comply with the rules given in this document. 4.2 Assumptions in the extended application The following assumptions are considered when evaluating extended applications for sandwich panels: the ceiling is required to possess fire resistance in the end-use condition; relevant classes are given in EN 13501-2,
the ceiling is assumed to be exposed on the entire face of one side (either from above or below) to the standardised heating conditions given in the EN 1363-1 fire resistance test specification, the structure to which the ceiling is fixed does not deflect during the fire exposure period; this simulates the non-deflecting nature of the test frame which forms part of the furnace test apparatus, NOTE In reality constructions deflect and this should be taken into account when designing the building and planning the constructional details. after delamination of the fire exposed facing the dead load of the panels is carried by a support structure to which the ends of the sandwich panels are attached; the forces from the dead load will be distributed to the support structure by the panel fixings which loadbearing capacity must be evaluated, the support structure has at least the same loadbearing capacity R of the resistance to fire performance as the sandwich panel ceiling regarding integrity, the self weight of the facing and core is calculated from the volume and density of the materials, kSIST FprEN 15254-7:2012
FprEN 15254-7:2011 (E) 7 the calculation of the reduction in the strength properties of steel at elevated temperature shall be in accordance with EN 1993-1-2. 4.3 Assumed structural behaviour of a sandwich panel in fire When one face of a sandwich panel assembly is exposed to fire the following behaviour may be expected. Delamination of the fire-exposed face will occur after a couple of minutes in a fire. After delamination the flexural strength of the assembly is lost and, unless both faces are restrained at the ends, the panels can collapse. The fastenings for the ends of the panels have to support the dead load of the whole panel for the entire fire resistance period. The behaviour slightly differs depending on the direction of the fire (from above or below). In both cases the structure acts as a catenary construction.
NOTE Annex A illustrates a typical behaviour of panels. 5 Rules for extended applications of the tested product 5.1 General When performing extended applications for a tested ceiling changes can occur either in the materials and/or in the construction. Both are dealt with in this standard. Table 1 and Table 2 list the changes which may or may not be made in an extended application assessment. The rules for the changes are either given direct in Table 1 or Table 2 or in 5.2 and 5.3. Table 1 — Material changes relevant to extended application Parameter Factors Factor influence on performance Rules Integrity E Insulation I Changes in metal facings Chemical composition of coating influence
no influence a
5.2.2.1 Change from coated to non coated metal no influence influence 5.2.2.1 Sheet thickness Influence no influence a Valid up to + 50 % of tested nominal thickness but no decrease is allowed for thicknesses below 0.5 mm and fixing capacity must be checked. Change from one metal to another Influence Influence 5.2.2.2 Change in sheet geometry Influence Influence 5.2.2.3 Changes in adhesive Amount
Influence influence 5.2.3 Type influence
no influence a 5.2.3 Changes in core material Type major influence major influence 5.2.4 Change in composition.
major influence
major influence
5.2.4.2 - 5.2.4.7 a It is understood that when a change in a factor can influence the integrity of a joint, there is a possibility that a change in leakage of hot gases or in joint geometry can also influence the temperature rise near the joint and therefore influence the insulation rating. kSIST FprEN 15254-7:2012
FprEN 15254-7:2011 (E) 8 Table 2 — Constructional changes relevant to extended application Parameter Factors Factor influence on performance Rules Integrity E Insulation I Span length Decrease no influence no influence
Allowed Increase influence
no influence a 5.3.1 Panel width Decrease no influence no influence Allowed Increase influence
no influence a Test results valid up to + 20 % Panel thickness e.g. core thickness Decrease/increase Influence major influence 5.3.2 Joint construction Type major influence
major influence
5.3.3 Stiching decreased influence
influence Not allowed Stiching increased influence
influence 5.3.3 Sealants Influence influence 5.3.3 Fixing system Type major influence
no influence a 5.3.4 Amount decreased major influence
no influence a 5.3.4 Amount increased influence
no influence a Allowed Protection decreased major influence
influence
5.3.4 Protection increased influence
influence
Allowed Length of assembly Decrease no influence no influence 5.3.5 Increase Influence no influence a 5.3.5 Width of assembly Decrease no influence no influence 5.3.5 Increase no influence no influence 5.3.5 Support structure Changes Influence no influence a 5.5 a It is understood that when a change in a factor can influence the integrity of a joint, there is a possibility that a change in leakage of hot gases or in joint geometry can also influence the temperature rise near the joint and therefore influence the insulation rating.
5.2 Variations in the materials of the product 5.2.1 General Sandwich panels consist of three main materials (facing metal sheets, adhesive and core material). In the case of autoadhesively bonded panels the foamed core material also form the adhesive layer during the foaming process.
Changes in the components of a panel can have influences on the fire resistance and the rules in Clause 5 apply for changes. 5.2.2 Variations in the metal sheets 5.2.2.1 Variations in the coatings The most essential property of the coating regarding fire resistance is the emissivity on the non-exposed side. Normally the emissivity for a coated steel sheet is between 0,8 and 0,95. A change in emissivity of -10 % for a new coating compared to the tested one is thus allowed if there is at least a 10 % margin in the insulation test kSIST FprEN 15254-7:2012
FprEN 15254-7:2011 (E) 9 result compared to the I-classification. Test results are always valid for coatings with higher emissivity values compared to the tested one. When a change in coating is made the manufacturer of the coated sheet shall provide emissivity properties for the products. A non-coated metal sheet can have an emissivity as low as 0,1. A change from a coated to a non-coated sheet is therefore not allowed. The same rule as for coatings above applies also in this case. A decrease in emissivity of 10 % is allowed if the emissivities for the different sheets are known. For changes in emissivity >10 % surface temperatures can be estimated from small-scale tests in accordance with 6.1 where the surface temperatures of the new panel is compared to the one tested in the reference scenario. If appropriate calculation methods are available the surface temperatures can also be calculated and compared provided that temperature dependent thermal resistance values for the core material are available. The energy content of the coating on the exposed side is small and will not affect the fire resistance properties of the sandwich panel. Test results are valid for all coatings If modifications in the coatings on the non-exposed side are made compared to the tested one, the ignitability of the modified coating shall be higher or equal to that tested. This can be checked from small scale tests according to 6.1. Test results are valid for all colours of the same type of coating. 5.2.2.2 Variations in the metal material The following rules are valid for extended applications: The test results are valid for all grades of tested normal steel and if once tested as stainless steel for all grades of stainless steel; a change from mild steel to stainless steel is not possible without further tests. For other types of metals the test result is valid for tested type only. For panels with perforated facings on one or both sides of the panels a test result achieved with a perforated facing is always valid for non-perforated facings in the same position as in the tested product. Test results for a product tested with non-perforated facings is valid only for a product with perforated facings on the fire exposed side where the perforation area is not greater than 25 % and where the reaction to fire class of the core material is A2-s1, d0 or better. Other changes are not allowed. 5.2.2.3 Changes in profile geometry of facing The following rules are valid for extended applications: for flat or small profiling (between 0 mm and 5 mm) test results are valid for any change; for profiles greater than 5 mm test results are valid for variations + 50 % of profile depth. 5.2.3 Variations in the adhesive This paragraph is valid only for panels with adhesively bonded cores. The following rules apply for an adhesive with no strength at high temperatures (> 500 oC) which means that the metal sheet on the exposed side will disconnect from the core in the very beginning of a fire and the construction will loose its sandwich capability. For this reason an organic adhesive cannot be changed to a non-organic one or vice versa.
Normally the energy content of the adhesive is small and will not affect the fire resistance properties of the sandwich panel. The following rules are valid for extended applications: for gross calorific potential PCS value 0 MJ/m2 to 4 MJ/m2; the results are valid for all adhesives when gross calorific potential PCS value stays between 0 MJ/m2 and 4 MJ/m2; kSIST FprEN 15254-7:2012
FprEN 15254-7:2011 (E) 10 for gross calorific potential PCS value is > 4 MJ/m2; the results are valid for gross calorific potential PCS values lower than the tested adhesive within manufacturing tolerances; for gross calorific potential PCS value > 4 MJ/m2 and > 1,15*PCS; test results shall be reduced by the same % as the gross calorific potential PCS value is over the initial tested adhesive. 5.2.4 Variations in the core material 5.2.4.1 General The following main core materials are used in sandwich panels: mineral wool (MW), polyurethane (PUR), extruded polystyrene (XPS), expanded polystyrene (EPS), phenolic foam and cellular glass. Mineral wool consists of stone wool and glass wool. The behaviour regarding fire is different and cannot be compared from one material to another. Changes from one core material to another are therefore not allowed in any extended application. Variations within each core material group are allowed in accordance with the rules given in 5.2.4.2 to 5.2.4.7. There are several factors in the different core materials affecting the fire properties of the core and of the sandwich panel. It is therefore not possible to extend the results from one core material producer to be valid for apparently similar materials from another producer. 5.2.4.2 Mineral wool (MW)
Generally the greater the density of the mineral wool the higher the flexural strength of the panel. Density will be dictated by room-temperature structural design requirements. However, variation in density affects the I-insulation value. The results are always valid for an increase in density in the density range 50 kg/m3 to 150 kg/m3. A decrease in density is allowed down to -10 % of tested density. Structural design will govern the orientation of fibres i.e. lamellas or slabs used in the panels. Changes in orientation of fibre has an influence on fire resistance and is therefore not allowed. Gaps between the lamellas or ends of lamella should be avoided. Test results are valid for panels with a decrease in the number of lamella joints. The mass of fibre binder used per unit volume of MW is governed by room-temperature structural design. Variation in binder content can affect the fire resistance properties and the following rules shall be followed:
Smaller amount of binder is always allowed compared to the tested one, An increase in binder content of 2 % - units is allowed if the total amount of binder is below 10 %. For example a result with 4 % binder is valid also for a core with 6 %. An increase is not allowed where the binder content is greater than 10 %. The nature and proportions of materials used to manufacture the MW fibres shall not be varied from those used in the reference test. Changes from one manufacturer to another are therefore not allowed. Therefore it is also to be noted that test results for stone wool panels can never be used for glass wool panels and vice versa.
5.2.4.3 Polyurethane (PUR) The test results are valid for the same chemical system and blowing agent. The test results are valid for + 10 % of tested density. 5.2.4.4 Extruded polystyrene (XPS) and expanded polystyrene (EPS) Small changes in chemical composition can have a great influence on the test results and the results shall only be used for the tested panels. No extended application is allowed. kSIST FprEN 15254-7:2012
FprEN 15254-7:2011 (E) 11 5.2.4.5 Phenolic foam
The test results are valid for the same chemical system and blowing agent. The test results are valid for + 10 % of tested density. 5.2.4.6 Cellular glass Small changes in chemical composition can have a great influence on the test results and the results shall only be used for the tested panels. No extended application is allowed.
5.3 Variations in the construction 5.3.1 Variations in span length Two aspects of fire integrity shall be assessed. First the ability of the whole panel assembly to resist collapse must be assessed when the adhesive bond fails on the exposed side and the panels lose their flexural strength. To resist collapse the ends of the panel facings shall be secured to the structure (the imaginary fire test frame in the extended application) using suspension details. Properly designed ceilings shall have both facings mechanically fastened (see typical solutions in Annex B) so they can not collapse before the support structure collapse (see 5.5). The strength of these suspension details (e.g. steel cleats with fastenings) shall be able to carry the dead loads at the temperatures they attain from an increased load of a longer span panel. This can be achieved by increasing the amount of fixings based on the rules and calculation method given in Annex C of this standard. The second aspect of integrity to be assessed shall be the ability of joints between adjoining sandwich panels to resist the passage of fire. This can be handled by limiting the allowable deflection to be the same as the maximum deflection at failure in the test. The rules and calculation method are given in Annex C of this standard. To be able to do an extension in the span length there shall be an overrun of at least 20 % subject to a minimum 10 min compared to the classification. 5.3.2 Variations in the panel thickness Variations in panel thicknesses are due to changes in thickness of the core material. An increase in thickness will lead to a better insulation value and a test result shall therefore always be valid for thicker panels. If thicker panels are used the loadbearing capacity of the end fixings must be checked in accordance with Annex C due to the increased load. Decrease in thickness is not allowed. If test results for three or more thicknesses are available results for other thicknesses may be linearly interpolated between the data points if the failure mode (insulation or integrity) is the same for all test results. If the difference between the minimum and maximum thickness is less than 50
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.