Test methods for determining the contribution to the fire resistance of structural members - Part 1: Horizontal protective membranes

This document specifies a test method for determining the ability of a horizontal protective membrane, when used as a fire resistant barrier, to contribute to the fire resistance of standard horizontal structural building members as defined in 6.4.2.
Test of horizontal protective membrane installed under a specific non-standard floor should be tested according to EN 1365-2.
This document contains the fire test which specifies the tests which are carried out whereby the horizontal protective membrane, together with the structural member to be protected, is exposed to a fire test according to the procedures defined herein. The fire exposure, to the temperature/time curve given in EN 1363-1, is applied from below the membrane itself.
The test method makes provision, through specified optional additional procedures, for the collection of data which can be used as direct input to the calculation of fire resistance according to the processes given within EN 1992-1-2, EN 1993-1-2, EN 1994-1-2 and EN 1995-1-2.
This document also contains the assessment which provides information relative to the analysis of the test data and gives guidance for the interpretation of the results of the fire test, in terms of loadbearing capacity criteria of the protected horizontal structural member.
In special circumstances, where specified in national building regulations, there can be a need to subject the protection material to a smouldering curve. The test for this and the special circumstances for its use are detailed in Annex C.
The limits of applicability of the results of the assessment arising from the fire test are defined, together with permitted direct application of the results to different structures, membranes and fittings.
This documentapplies only where there is a gap and a cavity between the horizontal protective membrane and the structural building member. Otherwise, the test methods in EN 13381-3, EN 13381 4 or EN 13381-5, as appropriate, apply.
Tests are intended to be carried out without additional combustible materials in the cavity.
Annex A gives details of assessing the performance of the ceiling when exposed to a semi-natural fire.

Prüfverfahren zur Bestimmung des Beitrages zum Feuerwiderstand von tragenden Bauteilen - Teil 1: Horizontal angeordnete Brandschutzbekleidungen

Dieses Dokument legt ein Prüfverfahren zur Bestimmung der Fähigkeit von als feuerwiderstandsfähigen Sperrschichten eingesetzten horizontalen Brandschutzbekleidungen fest, einen Beitrag zum Feuerwiderstand von horizontalen tragenden Normbauteilen nach 6.4.2 dieser Norm zu leisten.
Horizontale Brandschutzbekleidungen, die unter einer bestimmten nicht genormten Decke eingebaut sind, sollten nach EN 1365 2 geprüft werden.
Dieses Dokument umfasst das Brandprüfverfahren, das die auszuführenden Prüfungen festlegt, bei denen die horizontale Brandschutzbekleidung zusammen mit dem zu schützenden tragenden Bauteil einer in dieser Norm definierten Brandbelastung ausgesetzt wird. Die Brandbeanspruchung entsprechend der Temperaturzeitkurve nach EN 1363-1 erfolgt von unterhalb der Bekleidung.
Das Prüfverfahren bietet durch festgelegte wahlfreie Zusatzverfahren die Möglichkeit der Erfassung von Daten, die als direkte Eingangswerte für die rechnerische Ermittlung des Feuerwiderstands entsprechend den Verfahren nach EN 1992-1-2, EN 1993-1-2, EN 1994-1-2 und EN 1995-1-2 eingesetzt werden können.
Weiterhin liefert die in diesem Dokument enthaltene Beurteilung Angaben zur Analyse der Prüfdaten und eine Anleitung zur Auslegung der Ergebnisse der Brandprüfung in Bezug auf die Tragfähigkeitskriterien des geschützten horizontalen tragenden Bauteils.
Unter bestimmten Umständen, wenn dies in nationalen Bauvorschriften festgelegt ist, kann die Notwendigkeit bestehen, das Schutzmaterial einer Schwelbrandkurve zu unterziehen. Die entsprechende Prüfung und die besonderen Bedingungen für deren Anwendung sind in Anhang C ausführlich beschrieben.
Die Grenzen der Anwendbarkeit der Ergebnisse der Beurteilung, die sich aus der Brandprüfung ergeben, werden zusammen mit der zulässigen direkten Anwendung der Ergebnisse auf unterschiedliche Bauwerke, Brandschutzbekleidungen und Beschläge festgelegt.
Diese Europäische Norm gilt nur, wenn sowohl ein Spalt als auch ein Hohlraum zwischen der horizontal angeordneten Brandschutzbekleidung und dem tragenden Bauteil vorhanden ist. Anderenfalls gelten je nach Zutreffen die Prüfverfahren nach EN 13381-3, EN 13381-4 oder EN 13381-5.
Die Prüfungen werden ohne zusätzliche brennbare Materialien im Hohlraum durchgeführt.
Anhang A enthält Einzelheiten zur Beurteilung des Leistungsverhaltens von Unterdecken bei Beanspruchung durch einen Naturbrand.

Méthodes d’essai pour déterminer la contribution à la résistance au feu des éléments de construction - Partie 1 : Membranes de protection horizontales

Le présent document spécifie une méthode d’essai permettant de déterminer l’aptitude d’une membrane de protection horizontale, utilisée comme dispositif de protection contre le feu, à contribuer à la résistance au feu d’éléments de construction horizontaux normalisés tels que définis en 6.4.2.
Il convient qu’une membrane de protection horizontale installée sous un plancher spécifique non normalisé soit soumise à essai conformément à l’EN 1365-2.
Le présent document définit le mode opératoire des essais à réaliser au cours desquels la membrane de protection horizontale, ainsi que l’élément de construction à protéger, sont exposés au feu. L’exposition au feu, conformément à la courbe température/temps donnée dans l’EN 1363-1, est réalisée par le dessous de la membrane elle-même.
La méthode d’essai prévoit, grâce à des modes opératoires facultatifs complémentaires spécifiés, la collecte des données qui peuvent être utilisées directement comme données d’entrée pour le calcul de la résistance au feu conformément aux processus définis dans les EN 1992-1-2, EN 1993-1-2, EN 1994-1-2 et EN 1995-1-2.
Le présent document décrit également l’évaluation qui fournit des informations concernant l’analyse des données d’essai, ainsi que des recommandations pour l’interprétation des résultats de l’essai au feu, en termes de critères de capacité portante de l’élément de construction horizontal protégé.
Dans des circonstances particulières, lorsque les réglementations nationales en matière de construction le prescrivent, il peut être nécessaire de soumettre le matériau de protection à la courbe d’un feu couvant. Ce type d’essai et les circonstances particulières pour son utilisation sont détaillés à l’Annexe C.
Les limites d’applicabilité des résultats de l’évaluation découlant de l’essai au feu sont définies, ainsi que l’application directe admise des résultats à d’autres structures, membranes et accessoires.
Le présent document s’applique uniquement lorsqu’il existe un espace et un plénum entre la membrane de protection horizontale et l’élément de construction. Sinon, les méthodes d’essai décrites dans l’EN 13381-3, l’EN 13381-4 ou l’EN 13381-5, s’appliquent, selon le cas.
Les essais sont destinés à être réalisés sans matériaux combustibles supplémentaires dans le plénum.
L’Annexe A décrit en détail l’évaluation des performances d’un plafond exposé à un feu semi-naturel.

Preskusne metode za ugotavljanje prispevka k požarni odpornosti konstrukcijskih elementov - 1. del: Vodoravne zaščitne membrane

General Information

Status
Published
Public Enquiry End Date
19-Feb-2020
Publication Date
15-Jul-2020
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
14-Jul-2020
Due Date
18-Sep-2020
Completion Date
16-Jul-2020

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SLOVENSKI STANDARD
SIST EN 13381-1:2020
01-september-2020
Nadomešča:
SIST EN 13381-1:2014
Preskusne metode za ugotavljanje prispevka k požarni odpornosti konstrukcijskih
elementov - 1. del: Vodoravne zaščitne membrane

Test methods for determining the contribution to the fire resistance of structural members

- Part 1: Horizontal protective membranes
Prüfverfahren zur Bestimmung des Beitrages zum Feuerwiderstand von tragenden
Bauteilen - Teil 1: Horizontal angeordnete Brandschutzbekleidungen

Méthodes d’essai pour déterminer la contribution à la résistance au feu des éléments de

construction - Partie 1 : Membranes de protection horizontales
Ta slovenski standard je istoveten z: EN 13381-1:2020
ICS:
13.220.50 Požarna odpornost Fire-resistance of building
gradbenih materialov in materials and elements
elementov
91.080.01 Gradbene konstrukcije na Structures of buildings in
splošno general
SIST EN 13381-1:2020 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 13381-1:2020
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SIST EN 13381-1:2020
EN 13381-1
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2020
EUROPÄISCHE NORM
ICS 13.220.50; 79.060.20 Supersedes EN 13381-1:2014
English Version
Test methods for determining the contribution to the fire
resistance of structural members - Part 1: Horizontal
protective membranes

Méthodes d'essai pour déterminer la contribution à la Prüfverfahren zur Bestimmung des Beitrages zum

résistance au feu des éléments de construction - Partie Feuerwiderstand von tragenden Bauteilen - Teil 1:

1 : Membranes de protection horizontales Horizontal angeordnete Brandschutzbekleidungen

This European Standard was approved by CEN on 7 May 2020.

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, Republic of North Macedonia, Romania, Serbia, 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: Rue de la Science 23, B-1040 Brussels

© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 13381-1:2020 E

worldwide for CEN national Members.
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SIST EN 13381-1:2020
EN 13381-1:2020 (E)
Contents Page

European foreword ...................................................................................................................................................... 5

Introduction .................................................................................................................................................................... 7

1 Scope .................................................................................................................................................................... 8

2 Normative references .................................................................................................................................... 8

3 Terms and definitions, symbols and units ............................................................................................. 9

3.1 Terms and definitions ................................................................................................................................... 9

3.2 Symbols and units ......................................................................................................................................... 10

4 Test equipment .............................................................................................................................................. 10

4.1 General .............................................................................................................................................................. 10

4.2 Furnace ............................................................................................................................................................. 10

4.3 Loading equipment ...................................................................................................................................... 11

5 Test conditions .............................................................................................................................................. 11

5.1 General .............................................................................................................................................................. 11

5.2 Support and restraint conditions ............................................................................................................ 11

5.3 Loading conditions ....................................................................................................................................... 11

6 Test specimens .............................................................................................................................................. 12

6.1 General .............................................................................................................................................................. 12

6.2 Fixtures and fittings ..................................................................................................................................... 12

6.3 Horizontal protective membranes ......................................................................................................... 13

6.4 Structural building members supporting horizontal protective membranes ........................ 13

6.5 Properties of test materials ...................................................................................................................... 15

6.6 Verification of the test specimen ............................................................................................................. 15

6.7 Optional and additional plate thermometers within the cavity .................................................. 16

7 Installation of the test construction ....................................................................................................... 16

8 Conditioning ................................................................................................................................................... 16

9 Application of instrumentation ............................................................................................................... 16

9.1 General .............................................................................................................................................................. 16

9.2 Instrumentation for measurement of furnace temperature ......................................................... 16

9.3 Instrumentation for measurement of specimen temperature ..................................................... 16

9.4 Instrumentation for measurement of pressure ................................................................................. 18

9.5 Instrumentation for measurement of deflection .............................................................................. 19

9.6 Instrumentation for measurement of applied load .......................................................................... 19

10 Test procedure ............................................................................................................................................... 19

10.1 General .............................................................................................................................................................. 19

10.2 Furnace temperature and pressure ....................................................................................................... 19

10.3 Application and control of load ............................................................................................................... 19

10.4 Temperatures of test specimen ............................................................................................................... 19

10.5 Deflection ......................................................................................................................................................... 19

10.6 Observations ................................................................................................................................................... 19

10.7 Termination of the test ............................................................................................................................... 20

11 Test results ...................................................................................................................................................... 20

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SIST EN 13381-1:2020
EN 13381-1:2020 (E)

11.1 Acceptability of test results ....................................................................................................................... 20

11.2 Presentation of test results ....................................................................................................................... 20

12 Test report ....................................................................................................................................................... 21

13 Assessment ...................................................................................................................................................... 21

13.1 General .............................................................................................................................................................. 21

13.2 Assessment of loadbearing capacity ...................................................................................................... 22

13.3 Assessment of data for calculation purposes ...................................................................................... 23

14 Report of the assessment ........................................................................................................................... 23

15 Limits of applicability of the results of the assessment .................................................................. 25

15.1 Type of structural building member ...................................................................................................... 25

15.2 Type of concrete ............................................................................................................................................ 31

15.3 Type of steel beam ........................................................................................................................................ 32

15.4 Type of steel/concrete composite structures ..................................................................................... 32

15.5 Type of timber structure ............................................................................................................................ 33

15.6 Height of the cavity ....................................................................................................................................... 33

15.7 Exposed width of test specimen............................................................................................................... 33

15.8 Properties of the horizontal protective membrane ......................................................................... 33

15.9 Size of panels within the horizontal protective membrane .......................................................... 33

15.10 Fixtures and fittings ..................................................................................................................................... 33

15.11 Gaps between grid members and test frame or walls ..................................................................... 34

Annex A (normative) Exposure to a semi-natural fire .................................................................................. 40

A.1 General .............................................................................................................................................................. 40

A.2 Semi-natural fire source ............................................................................................................................. 40

A.3 Test equipment .............................................................................................................................................. 40

A.4 Test conditions ............................................................................................................................................... 41

A.5 Test specimen ................................................................................................................................................. 41

A.6 Installation of the test specimen ............................................................................................................. 42

A.7 Conditioning.................................................................................................................................................... 42

A.8 Application of instrumentation ............................................................................................................... 42

A.9 Test procedure ............................................................................................................................................... 42

A.10 Test results ...................................................................................................................................................... 42

A.11 Test report ....................................................................................................................................................... 42

A.12 The assessment .............................................................................................................................................. 42

A.13 The assessment report ................................................................................................................................ 43

Annex B (normative) Measurement of properties of horizontal protective membranes and

components ..................................................................................................................................................... 44

B.1 General .............................................................................................................................................................. 44

B.2 Thickness of horizontal protective membrane and its components .......................................... 44

B.3 Density of horizontal protective membranes and components thereof ................................... 45

B.4 Moisture content of horizontal protective membrane and components thereof .................. 46

Annex C (normative) Test method to the smouldering fire (slow heating curve) .............................. 47

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SIST EN 13381-1:2020
EN 13381-1:2020 (E)

C.1 Introduction .................................................................................................................................................... 47

C.2 Test equipment .............................................................................................................................................. 47

C.3 Test specimens .............................................................................................................................................. 47

C.4 Termination of test ....................................................................................................................................... 47

C.5 Evaluation of the results ............................................................................................................................. 48

Bibliography ................................................................................................................................................................. 49

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SIST EN 13381-1:2020
EN 13381-1:2020 (E)
European foreword

This document (EN 13381-1:2020) 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 January 2021, and conflicting national standards shall

be withdrawn at the latest by January 2021.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN 13381-1:2014.
The main changes with respect to the previous edition are listed below:
Clarifications regarding the following items:
a) determination of the characteristic surface temperature curve;

b) limits of applicability (addition of integrity and insulation performances in the tables);

c) assessment when the semi-natural fire test is performed (Annex A).

This document has been prepared under a mandate given to CEN by the European Commission and the

European Free Trade Association.

This document is one of a series of standards for evaluating the contribution to the fire resistance of

structural members by applied fire protection materials. The other parts of this series are:

— 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 members,
— Part 6: Applied protection to concrete filled hollow steel columns,
— Part 7: Applied protection to timber members,
— Part 8: Applied reactive protection to steel members,
— Part 9: Applied fire protection systems to steel beams with web openings.

The fire protection capacity of the horizontal protective membrane can be nullified by the presence of

combustible materials in the cavity above the membrane. The applicability of the results of the

assessment is limited according to the quantity and position of such combustible materials within that

cavity. The amount of combustible material permissible in the cavity is typically given in national

regulations.
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SIST EN 13381-1:2020
EN 13381-1:2020 (E)

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, France, Germany, Greece, Hungary, Iceland, Ireland,

Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North

Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United

Kingdom.
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SIST EN 13381-1:2020
EN 13381-1:2020 (E)
Introduction

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 document should be followed.

WARNING: When performing this test method, laboratories should expect that there can be significant

quantities of smoke released. This smoke release is expected to be very significant where the fire test

involves timber and timber based components. Laboratories should ensure that appropriate smoke

extraction facilities are provided.
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SIST EN 13381-1:2020
EN 13381-1:2020 (E)
1 Scope

This document specifies a test method for determining the ability of a horizontal protective membrane,

when used as a fire resistant barrier, to contribute to the fire resistance of standard horizontal structural

building members as defined in 6.4.2.

Test of horizontal protective membrane installed under a specific non-standard floor should be tested

according to EN 1365-2.

This document contains the fire test which specifies the tests which are carried out whereby the

horizontal protective membrane, together with the structural member to be protected, is exposed to a

fire test according to the procedures defined herein. The fire exposure, to the temperature/time curve

given in EN 1363-1, is applied from below the membrane itself.

The test method makes provision, through specified optional additional procedures, for the collection of

data which can be used as direct input to the calculation of fire resistance according to the processes

given within EN 1992-1-2, EN 1993-1-2, EN 1994-1-2 and EN 1995-1-2.

This document also contains the assessment which provides information relative to the analysis of the

test data and gives guidance for the interpretation of the results of the fire test, in terms of loadbearing

capacity criteria of the protected horizontal structural member.

In special circumstances, where specified in national building regulations, there can be a need to subject

the protection material to a smouldering curve. The test for this and the special circumstances for its use

are detailed in Annex C.

The limits of applicability of the results of the assessment arising from the fire test are defined, together

with permitted direct application of the results to different structures, membranes and fittings.

This document applies only where there is a gap and a cavity between the horizontal protective

membrane and the structural building member. Otherwise, the test methods in EN 13381-3, EN 13381-4

or EN 13381-5, as appropriate, apply.

Tests are intended to be carried out without additional combustible materials in the cavity.

Annex A gives details of assessing the performance of the ceiling when exposed to a semi-natural fire.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

EN 1363-1:2020, Fire resistance tests — Part 1: General Requirements
EN 1363-2, Fire resistance tests — Part 2: Alternative and additional procedures

EN 1992-1-1, Eurocode 2: Design of concrete structures — Part 1-1: General rules and rules for buildings

EN 1992-1-2, Eurocode 2: Design of concrete structures — Part 1-2: General rules — Structural fire design

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
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SIST EN 13381-1:2020
EN 13381-1:2020 (E)

EN 1994-1-2, Eurocode 4 — Design of composite steel and concrete structures — Part 1-2: General rules —

Structural fire design

EN 1995-1-1, Eurocode 5: Design of timber structures — Part 1-1: General — Common rules and rules for

buildings

EN 1995-1-2, Eurocode 5: Design of timber structures — Part 1-2: General — Structural fire design

EN 312, Particleboards — Specifications

EN 823, Thermal insulating products for building applications — Determination of thickness

EN 12467, Fibre-cement flat sheets — Product specification and test methods

EN 13381-4, Test methods for determining the contribution to the fire resistance of structural members —

Part 4: Applied passive protection to steel members

EN 13381-5, Test methods for determining the contribution to the fire resistance of structural members —

Part 5: Applied protection to concrete/profiled sheet steel composite member

EN 13381-7, Test methods for determining the contribution to the fire resistance of structural members —

Part 7: Applied protection to timber members
EN ISO 13943, Fire safety — Vocabulary (ISO 13943)
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.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp/ui
3.1.1
horizontal structural building member

horizontal structural element of building construction which is loadbearing, separating and which is

fabricated from concrete, steel, steel/concrete composite or timber
3.1.2
horizontal protective membrane

horizontal membrane or ceiling lining that does not form any part of any loadbearing part of the

structure and can comprise multiple layers of materials, together with any supporting framework,

hangers, fixings and any insulation materials which is either suspended from or attached directly to a

structural building member, or is self-supporting and fixed beneath a structural building member, and

which is intended to give additional fire resistance to that structural building member, as for example

ceiling tiles resting on a light supporting frame, ceiling boards, metal trays, plastered and similar ceilings

not directly applied to the underside of the structural member
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SIST EN 13381-1:2020
EN 13381-1:2020 (E)
3.1.3
separating gap

distance between the non-exposed surface of the horizontal protective membrane and the lowest

surface of the exposed side of the structural building member
3.1.4
cavity

whole void or voids between the non-exposed surface of the horizontal protective membrane and the

highest surface of the exposed side of the structural building member
3.1.5
horizontal protective membrane test specimen

full horizontal protective membrane assembly submitted for test, including typical fixing equipment and

methods and typical features such as insulating materials, light fittings, ventilation ducts and access

panels
3.1.6
fire protection

protection afforded to the structural building member by the horizontal protective membrane system

such that the temperature on the surface of the structural building member and within the cavity is

limited throughout the period of exposure to fire
3.1.7
characteristic temperature

average of the mean temperature and the maximum individual temperature [(mean + maximum)/2] for

a group of thermocouples
3.2 Symbols and units
Symbol Unit Designation
Am/V m Section factor of unprotected steel beam (see EN 13381-4).
L mm Exposed length of the structural building member.
exp

L mm Total length of the main beams or members of the structural building member.

spec

L mm Centre to centre distance between the supports of the structural building member

sup
tested.
4 Test equipment
4.1 General
The furnace and test equipment shall be as specified in EN 1363-1.
4.2 Furnace

The furnace shall be designed to permit the dimensions of the test specimen to be exposed to heating to

be as specified in 6.4.1 and its installation to be as described in Clause 7.
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SIST EN 13381-1:2020
EN 13381-1:2020 (E)
4.3 Loading equipment

Loading shall be applied according to EN 1363-1. The loading system shall permit loading, of the

magnitude defined in 5.3, to be uniformly applied along the length and width of the test specimen at

loading points positioned as defined in 5.3.

The loading equipment shall not inhibit the free movement of air above the test specimen and no part of

the loading equipment, other than at the loading points, shall be closer than 60 mm to the unexposed

surface of the test specimen.
5 Test conditions
5.1 General
A horizontal structu
...

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