ISO 834:1975/Amd 2:1980

INTERNATIONAL STANDARD IS0 834=1975/AMENDMENT 2
Published 1980-09-01
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION l MEXA’YHAPOAHAJl OPI-AHM3ALIMfi no CTAHLW’TM3ALWM l ORGANIZATION INTERNATIONALE DE NORMALISATION
Fire-resistance tests - Elements of building construction
AMENDMENT 2
Amendment 2 to International Standard IS0 834-1975 was developed by Technical Committee ISO/TC 92, Fire tests on bui/ding
materials, components and structures, and was circulated to the member bodies in March 1979.
It has been approved by the member bodies of the following countries :
Ireland
Australia Romania
Belgium Israel
South Africa, Rep. of
Brazil Italy Spain
Japan
Bulgaria Sweden
Canada Korea, Rep. of
Switzerland
Czechoslovakia Libyan Arab Jamahiriya Turkey
Denmark Mexico
United Kingdom
Egypt, Arab Rep. of Netherlands USA
Hungary New Zealand USSR
India Norway
Yugoslavia
The member bodies of the following countries expressed disapproval of the document on technical grounds :
France
Germany, F. R.
Page 9
a) Replace A.3.1 by the following :
A.3.1 Furnace
A precise definition of a time-temperature curve for a fire-resistance test according to 4.1.1 is not sufficient as the sole characteristic
for determining the temperature fields in an element of building construction exposed to a fire. Another essential factor is the coeffi-
cient of heat transfer to the surfaces of the element exposed to the fire. This coefficient is primarily influenced by the convection and
radiation conditions.
For a prescribed time-temperature curve, the convection and radiation conditions can vary considerably from one furnace to another,
depending on variables such as the geometry of the furnace chamber and the thermal properties of its lining material, the type of fuel,
the number, type and location of the burners, and the method of ventilating the furnace. For this reason, test results obtained in
different laboratories may be difficult to correlate. Ideally, it would be preferable to control furnaces so as to regulate the total heat
flux at the surface of the test assembly. Until the serious instrumental difficulties inherent in such a scheme are
solved it is necessary to retain the time-temperature approach.
UDC 69.02 : 699.81 : 620.1
Ref. No. IS0 834.1975/A2-1980 (E)
buildings, construction
Descriptors : materials, structural members, floors, walls, partition walls, columns (supports), beams, roofing, tests, fire
tests, testing conditions.
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International Organization for Standardization, 1980 Price based on 1 pag
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