ISO 834-7:2025

Fire-resistance tests — Elements of building construction — Part 7: Specific requirements for columns

This document specifies the procedures to be followed for determining the fire resistance of columns when tested on their own. Two methods of testing are described: — Method A, which is applicable to any type of column and in which the test is conducted with an applied axial load to the column; and — Method B, which is only applicable to protected steel columns with any type of protection system and in which the test is conducted with no load applied to the column and the fire resistance is determined based on steel temperature limits. Method B is only applicable to protection systems that do not support any of the structural load. (See A.6). The application of this test to other untested forms of construction is acceptable when the construction conforms to the direct field of application as given in Annex B of this document, or when subjected to an extended application analysis in accordance with ISO/TR 12470 (series)[ REF Reference_ref_3 \r \h 1 08D0C9EA79F9BACE118C8200AA004BA90B0200000008000000100000005200650066006500720065006E00630065005F007200650066005F0033000000 ]. General guidance on test method A and test method B is given in Annex A.

Essais de résistance au feu — Éléments de construction — Partie 7: Exigences spécifiques relatives aux poteaux

La présente partie de l'ISO 834 spécifie la méthode d'essai à suivre pour déterminer la résistance des poteaux lorsqu'ils sont essayés séparément. Les poteaux sont normalement soumis à l'essai de résistance au feu sur toutes leurs faces. Lorsque l'exposition à la chaleur concerne moins de quatre faces, les conditions d'exposition appropriées doivent être reproduites. Il est acceptable d'étendre l'application du présent essai à d'autres formes de construction non essayées si la construction est conforme au domaine d'application direct indiqué dans la présente partie de l'ISO 834 ou si la construction est soumise à une analyse d'extension de classement conformément à l'ISO/TR 12470. L'ISO/TR 12470 ne donnant que des lignes directrices générales, les analyses spécifiques d'application élargie ne peuvent être effectuées que par des experts des constructions résistantes au feu. Les lignes directrices générales applicables à la présente méthode d'essai sont données en annexe A.

General Information

• Status: Published
• Publication Date: 08-Jul-2025
• ICS: 13.220.50 - Fire-resistance of building materials and elements
• Technical Committee: ISO/TC 92/SC 2 - Fire containment
• Drafting Committee: ISO/TC 92/SC 2 - Fire containment
• Current Stage: 6060 - International Standard published
• Start Date: 09-Jul-2025
• Due Date: 23-Jan-2026
• Completion Date: 09-Jul-2025

Relations

• Revises: ISO 834-7:2000 - Fire-resistance tests — Elements of building construction — Part 7: Specific requirements for columns
• Effective Date: 28-Jan-2023

Standards Content (Sample)

International
Standard
ISO 834-7
Second edition
Fire-resistance tests — Elements of
2025-07
building construction —
Part 7:
Specific requirements for columns
Essais de résistance au feu — Éléments de construction —
Partie 7: Exigences spécifiques relatives aux poteaux
Reference number
© ISO 2025
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Test method A – Loaded columns . 2
4.1 Test equipment .2
4.2 Test conditions .2
4.2.1 Restraint and boundary conditions .2
4.3 Loading .3
4.4 Test specimen preparation .3
4.4.1 Specimen design .3
4.4.2 Specimen size .3
4.4.3 Number of test specimens . .3
4.4.4 Specimen conditioning .4
4.4.5 Specimen installation and restraint .4
4.5 Application of instrumentation .4
4.5.1 Furnace thermocouples (plate thermometer) .4
4.5.2 Specimen thermocouples .4
4.5.3 Deformation measurement .5
4.6 Test procedure .5
4.6.1 Load application . .5
4.6.2 Furnace control .5
4.6.3 Measurements and observations.5
4.7 Performance criteria .5
4.8 Validity of the test .6
4.9 Expression of results .6
4.10 Test report .6
5 Test method B – Protected steel columns tested without an applied axial load . 6
5.1 Test equipment .6
5.2 Test conditions .6
5.2.1 Restraint and boundary conditions .6
5.3 Test specimen preparation .6
5.3.1 Specimen design .6
5.3.2 Specimen size .7
5.3.3 Number of test specimens . . .7
5.3.4 Specimen conditioning .7
5.4 Application of instrumentation .7
5.4.1 Furnace thermocouples (plate thermometer) .7
5.4.2 Specimen thermocouples .7
5.5 Test procedure .8
5.5.1 Furnace control .8
5.5.2 Measurements and observations.8
5.6 Performance criteria .8
5.7 Validity of the test .9
Annex A (informative) General guidance on test methods A and B (as indicated) .10
Annex B (informative) Direct application of results – For test methods A and B .12
Bibliography .13

iii
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity, or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 92, Fire safety, Subcommittee SC 2, Fire
resistance.
This second edition cancels and replaces the first edition (ISO 834-7:2000), which has been technically
revised.
The main changes are as follows:
— an alternative method of test for the protection of steel columns without an applied axial load has been
added. The alternative method (non-loaded) is referred to as "Method B". The original method, which
requires columns to be tested with an applied axial load, is now referred to as "Method A".
A list of all parts in the ISO 834 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.

iv
Introduction
This document contains specific requirements for fire-resistance testing which are unique to the elements
of building construction described as columns. The requirements for these loadbearing elements are
intended to be applied as appropriate in conjunction with the detailed and general requirements contained
in ISO 834-1.
v
International Standard ISO 834-7:2025(en)
Fire-resistance tests — Elements of building construction —
Part 7:
Specific requirements for columns
1 Scope
This document specifies the procedures to be followed for determining the fire resistance of columns when
tested on their own. Two methods of testing are described:
— Method A, which is applicable to any type of column and in which the test is conducted with an applied
axial load to the column; and
— Method B, which is only applicable to protected steel columns with any type of protection system and
in which the test is conducted with no load applied to the column and the fire resistance is determined
based on steel temperature limits.
Method B is only applicable
...

FINAL DRAFT
International
Standard
ISO/FDIS 834-7
ISO/TC 92/SC 2
Fire-resistance tests — Elements of
Secretariat: ANSI
building construction —
Voting begins on:
2025-04-22
Part 7:
Specific requirements for columns
Voting terminates on:
2025-06-17
Essais de résistance au feu — Éléments de construction —
Partie 7: Exigences spécifiques relatives aux poteaux
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 SUPPOR TING DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
Reference number
ISO/FDIS 834-7:2025(en) © ISO 2025

FINAL DRAFT
ISO/FDIS 834-7:2025(en)
International
Standard
ISO/FDIS 834-7
ISO/TC 92/SC 2
Fire-resistance tests — Elements of
Secretariat: ANSI
building construction —
Voting begins on:
Part 7:
Specific requirements for columns
Voting terminates on:
Essais de résistance au feu — Éléments de construction —
Partie 7: Exigences spécifiques relatives aux poteaux
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 SUPPOR TING DOCUMENTATION.
© ISO 2025
IN ADDITION TO THEIR EVALUATION AS
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
or ISO’s member body in the country of the requester.
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland Reference number
ISO/FDIS 834-7:2025(en) © ISO 2025

ii
ISO/FDIS 834-7:2025(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Test method A – Loaded columns . 2
4.1 Test equipment .2
4.2 Test conditions .2
4.2.1 Restraint and boundary conditions .2
4.3 Loading .3
4.4 Test specimen preparation .3
4.4.1 Specimen design .3
4.4.2 Specimen size .3
4.4.3 Number of test specimens . .3
4.4.4 Specimen conditioning .4
4.4.5 Specimen installation and restraint .4
4.5 Application of instrumentation .4
4.5.1 Furnace thermocouples (plate thermometer) .4
4.5.2 Specimen thermocouples .4
4.5.3 Deformation measurement .5
4.6 Test procedure .5
4.6.1 Load application . .5
4.6.2 Furnace control .5
4.6.3 Measurements and observations.5
4.7 Performance criteria .5
4.8 Validity of the test .6
4.9 Expression of results .6
4.10 Test report .6
5 Test method B – Protected steel columns tested without an applied axial load . 6
5.1 Test equipment .6
5.2 Test conditions .6
5.2.1 Restraint and boundary conditions .6
5.3 Test specimen preparation .6
5.3.1 Specimen design .6
5.3.2 Specimen size .7
5.3.3 Number of test specimens . . .7
5.3.4 Specimen conditioning .7
5.4 Application of instrumentation .7
5.4.1 Furnace thermocouples (plate thermometer) .7
5.4.2 Specimen thermocouples .7
5.5 Test procedure .8
5.5.1 Furnace control .8
5.5.2 Measurements and observations.8
5.6 Performance criteria .8
5.7 Validity of the test .9
Annex A (informative) General guidance on test methods A and B (as indicated) .10
Annex B (informative) Direct application of results – For test methods A and B .12
Bibliography .13

iii
ISO/FDIS 834-7:2025(en)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity, or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 92, Fire safety, Subcommittee SC 2, Fire
resistance.
This second edition cancels and replaces the first edition (ISO 834-7:2000), which has been technically
revised.
The main changes are as follows:
— an alternative method of test for the protection of steel columns without an applied axial load has been
added. The alternative method (non-loaded) is referred to as "Method B". The original method, which
requires columns to be tested with an applied axial load, is now referred to as "Method A".
A list of all parts in the ISO 834 series can be found on the ISO
...

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Secretariat: ANSI
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Fire-resistance tests — Elements of building construction — —
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Specific requirements for columns Style Definition
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ISO/DIS FDIS 834-7:2024(E2025(en)
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Formatted: Font: 11 pt, Bold
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication Formatted: HeaderCentered, Space After: 0 pt, Line
may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying,
spacing: single
or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO
Commented [eXtyles1]: The reference "ISO 2025" is to a
at the address below or ISO’s member body in the country of the requester.
withdrawn standard
Formatted: Default Paragraph Font
ISO copyright office
CP 401 • Ch. de Blandonnet 8
Formatted: Default Paragraph Font
CH-1214 Vernier, Geneva
Formatted: Adjust space between Latin and Asian text,
Phone: + 41 22 749 01 11
Adjust space between Asian text and numbers
EmailE-mail: [e-mail]
Website: www.iso.orgwww.iso.org
Formatted: French (France)
Formatted: French (France)
Published in Switzerland
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pt, Line spacing: single
2 © ISO 2024 – All rights reserved
ii
ISO/FDIS 834-7:2025(en)
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Formatted: HeaderCentered, Left, Space After: 0 pt,
Line spacing: single
Contents
Formatted: Adjust space between Latin and Asian text,
Adjust space between Asian text and numbers, Tab
stops: Not at 15.39 cm
Foreword . v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Test method A – Loaded columns . 2
4.1 Test equipment . 2
4.2 Test conditions . 3
4.3 Loading . 3
4.4 Test specimen preparation . 3
4.5 Application of instrumentation . 4
4.6 Test procedure . 6
4.7 Performance criteria . 6
4.8 Validity of the test . 6
4.9 Expression of results . 6
4.10 Test report . 6
5 Test method B – Protected steel columns tested without an applied axial load. 6
5.1 Test equipment . 6
5.2 Test conditions . 7
5.3 Test specimen preparation . 7
5.4 Application of instrumentation . 8
5.5 Test procedure . 9
5.6 Performance criteria . 10
5.7 Validity of the test . 10
Annex A (informative) General guidance on test methods A and B (as indicated) . 11
Annex B (informative) Direct application of results – For test methods A and B . 13
Bibliography . 14

Foreword . v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Test Method A – Loaded Columns . 2
4.1 Test equipment . 2
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4.2 Test conditions . 4
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4.3 Loading . 4
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4.4 Test specimen preparation . 4
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4.5 Application of instrumentation . 6 Tab stops: Not at 17.2 cm
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4.6 Test procedure . 7
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4.7 Performance criteria . 7
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© ISO 2025 – All rights reserved
iii
ISO/DIS FDIS 834-7:2024(E2025(en)
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4.8 Validity of the test . 7
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4.9 Expression of results. 7
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4.10 Test report . 8
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5 Test Method B – Protected Steel Columns Tested without an Applied Axial Load . 8
5.1 Test equipment . 8
5.2 Test conditions . 8
5.3 Test Specimen Preparation . 8
5.4 Application of instrumentation . 9
5.5 Test procedure . 11
5.6 Performance criteria . 11
5.7 Validity of the test . 11
Annex A (informative) General guidance on test method A and B (as indicated) . 12
A.1 General – Test Method A . 12
A.2 Design considerations – Test Method A . 12
A.2.1 End support conditions . 12
A.2.2 Conditioning of end collars . 12
A.3 Loading – Test Method A . 12
A.4 Temperature measurement – Test Method A and B . 12
A.5 Column behaviour in the test – Test Method A . 13
A.6 Non-loaded Protected Steel Columns – Test Method B . 13
Annex B (informative) Direct application of results – For Test Methods A and B . 14
Bibliography . 15
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4 © ISO 2024 – All rights reserved
iv
ISO/FDIS 834-7:2025(en)
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Formatted: HeaderCentered, Left, Space After: 0 pt,
Line spacing: single
Foreword
Formatted: Adjust space between Latin and Asian text,
Adjust space between Asian text and numbers
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electr
...