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GB/T 26784-2011Fire resistance test for elements of building construction -- Alternative and additional procedures (English PDF)

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Issued by

General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China

Level / Type

National · Recommended

Issue date

July 20, 2011

Implementation date

November 1, 2011

Scope

GB/T 26784-2011 (Fire resistance test for elements of building construction -- Alternative and additional procedures) is available as an English-translated PDF.

GB/T 26784-2011 — This Standard specifies alterative fire heating curves and other procedures that may need to be adopted under special fire circumstances of the elements of building construction.

The alternative fire heating curves include hydrocarbon (HC), external fire exposure, slow heating, electric fire and tunnel fire RABT-ZTV heating curves; the additional test procedures include (weight and spray water) impact test and measurement of radiation.

This Standard is applicable to the elements or accessories of building construction which need to be subject to fire resistance test under special fire heating curve conditions and/or to be subject to other additional tests during fire resistance test.

Unless one of the alternative fire heating curves is specifically required, the standard temperature-time curve given in GB/T 9978.1 shall be used. Similarly, the (weight and spray water) impact test and measurement of radiation shall only be undertaken when they are specifically requested.

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Document preview — GB/T 26784-2011

National Standard of the People's Republic of China

ICS: 13.220.50
Classification: C 82

Issued by: General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China

Foreword...3
1 Scope...4
2 Normative References...4
3 Terms and Definitions...5
4 Alternative Heating Curves...5
5 Additional Test Procedures...13

Foreword

This Standard is developed in accordance with the rules given in GB/T 1.1-2009.

This Standard refers to the technical content of EN 1363-2.1999 Fire Resistance Tests -

Part 2.Alternative and Additional Procedures (English edition).

This Standard is changed largely from EN 1363-2.1999 in terms of structure. See Annex A

for the comparison of chapter and article numbers in this Standard and those in EN

1363-2.1999.

There are technical differences between this Standard and EN 1363-2.1999.The

differences are marked by perpendicular single line (|) in the outer side page margin of

corresponding clauses. See Annex B for the list of corresponding technical differences

and their reasons.

This Standard was proposed by the Ministry of Public Security of the People's Republic of

China.

This Standard shall be under the jurisdiction of Subcommittee on Fire Endurance of

Building Elements of National Technical Committee on Fire Protection of

Standardization Administration of China (SAC/TC 113/SC 8).

Fire Resistance Test for Elements of Building

Construction - Alternative and Additional Procedures

Warning. The fire resistance test of for elements building construction may be

hazardous and there is a possibility that toxic and/or harmful smoke and gases may

be evolved during the test. Mechanical and operational hazards may also arise

during the construction of the test specimens, and their testing and disposal of test

residues. An assessment of all potential hazards and risks to health shall be made

and safety precautions shall be identified and provided. Written safety instructions

shall be issued. Appropriate training shall be given to relevant personnel.

Laboratory personnel shall ensure that they follow written safety instructions at all

times.

1 Scope

This Standard specifies alterative fire heating curves and other procedures that may need

to be adopted under special fire circumstances of the elements of building construction.

The alternative fire heating curves include hydrocarbon (HC), external fire exposure, slow

heating, electric fire and tunnel fire RABT-ZTV heating curves; the additional test

procedures include (weight and spray water) impact test and measurement of radiation.

This Standard is applicable to the elements or accessories of building construction which

need to be subject to fire resistance test under special fire heating curve conditions and/or

to be subject to other additional tests during fire resistance test.

Unless one of the alternative fire heating curves is specifically required, the standard

temperature-time curve given in GB/T 9978.1 shall be used. Similarly, the (weight and

spray water) impact test and measurement of radiation shall only be undertaken when

they are specifically requested.

2 Normative References

The following referenced documents are indispensable for the application of this

document. For dated reference, only the edition cited applies. For undated references, the

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

GB/T 5907 Fundamental Terminology of Fire Protection - Part 1

GB 6246 Lined Fire Hose - Performance Requirements and Test Methods

GB 8181 Fire Nozzles

GB/T 9978.1 Fire-resistance Tests - Elements of Building Construction - Part 1.General

Requirements (GB/T 9978.1-2008, ISO 834-1.1999, MOD)

GB/T 9978.4 Fire-resistance Tests - Elements of Building Construction - Part 4.Specific

Requirements for Loadbearing Vertical Separating Elements (GB/T

9978.4-2008, ISO 834-4.2000, MOD)

3 Terms and Definitions

For the purposes of this document, the terms and definitions given in GB/T 5907 and

GB/T 9978.1 and the following apply.

3.1

heat flux

the quantity of heat energy per unit area incident on the target of the measuring device. It

includes heat transferred by convection as well as that due to radiation

4 Alternative Heating Curves

4.1 Hydrocarbon (HC) heating curve

4.1.1 General

In assessment on the fire resistance of the elements of building construction under fire

conditions of liquid hydrocarbon, hydrocarbon (HC) heating curve specified in 4.1.2 may

be adopted to carry out fire resistance test.

4.1.3 Tolerances for furnace temperature

During the fire resistance test according to standard temperature-time curve of

hydrocarbon (HC) fire, the percentage deviation (de) in the area of the curve of the

average temperature measured and recorded by the thermocouples in fire-resistance test

furnace versus time from the area of the temperature-time curve specified in standard

shall be represented by Formula (2), and the value of de shall be controlled within.

4.3 Slow heating curve

4.3.1 General

In assessment on the fire resistance of the separating elements of building construction

under slowly growing fire conditions, slow heating curve specified in 4.3.2 may be adopted

to carry out fire resistance test.

4.3.3 Tolerances for furnace temperature

During the fire resistance test according to standard temperature-time curve of slowly

growing fire, the deviation of temperature in fire-resistance test furnace shall be controlled

as stated in 4.1.3.

4.3.4 Assessment of performance

Fire resistance of samples shall be assessed by comparing the behaviours of samples

tested using the slow heating curve with that obtained using the standard

temperature-time curve specified in GB/T 9978.1.

4.4 Electric fire heating curve

4.4.1 General

In assessment on the fire resistance of the elements of building construction or cable

plugging components under electric fire conditions (with organic polymer materials as the

main fuel), electric fire heating curve specified in 4.4.2 may be adopted to carry out fire

resistance test.

4.5 Tunnel fire RABT-ZTV heating curve

4.5.1 General

In assessment on the fire resistance of elements of building construction or tunnel

structures under tunnel fire RABT-ZTV heating conditions, tunnel fire RABT-ZTV heating

curve specified in 4.5.2 may be adopted to carry out fire resistance test.

4.5.3 Tolerances for furnace temperature

During the fire resistance test according to tunnel fire RABT-ZTV heating curve specified

in this chapter, the percentage deviation (de) in the area of the curve of the average

temperature measured and recorded by the thermocouples in fire-resistance test furnace

versus time from the area of the temperature-time curve specified in standard shall be

represented by Formula (2), and the value of de shall be controlled within.

5 Additional Test Procedures

5.1 Weight impact test

5.1.1 General

In actual building fire, the fire resistance (including fire separation function) of such

elements and accessories of building construction as fire wall, fire partition, fire resistant

shutter and fire door obtained using the fire resistance test methods specified in GB/T

9978.1 may be influenced by impacts arising from the failure of other components and

objects exposed to fire. If it is needed to test such influence, weight impact test may be

additionally carried out during fire resistance test for the elements and accessories of

building construction.

5.1.3 Application of test

The impact body is brought to its starting position by raising it by a suitable lifting device.

For this purpose, a steel band consisting of two steel cables of 6mm diameter shall be

wrapped tightly around the centre of the filled sack and the lifting device is equipped with a

ring for the convenience of lifting and releasing the impact body.

5.1.4 Procedure

Three impacts shall be applied to the test specimen within 5min after the end of the fire

resistance test. For loadbearing walls, the first two impacts shall be applied to the test

specimen while the test specimen is still loaded. The third impact shall be applied after

removal of the test load.

5.2 Spray water impact test

5.2.1 General

When the separating elements of building construction are subject to fire resistance test

according to the method specified in GB/T 9978.1, additional spray water impact test may

be carried out as needed. See Annex D for the application guide of spray water impact

test.

5.2.3 Procedure

5.2.3.1 Spray water impact test shall be carried out on the exposed surface of test

specimen within 3min after the end of fire resistance test.

5.3.4 Test result

At each specific measurement location, the time for the measured radiation to exceed the

value of 5kW/m2, 10kW/m2, 15kW/m2, 20kW/m2 and 25kW/m2 shall be recorded.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 13 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 5907 · ISO 834 · GB/T 9978.4

Cited by

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