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GB/T 26784-2011: Fire resistance test for elements of building construction -- Alternative and additional procedures Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid
Similar standardsGB/T 26784-2011: Fire resistance test for elements of building construction -- Alternative and additional procedures---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT26784-2011 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 13.220.50 C 82 Fire Resistance Test for Elements of Building Construction - Alternative and Additional Procedures Issued on. JULY 20, 2011 Implemented on. NOVEMBER 1, 2011 Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China; Standardization Administration of the People's Republic of China. Table of ContentsForeword... 3 1 Scope... 4 2 Normative References... 4 3 Terms and Definitions... 5 4 Alternative Heating Curves... 5 5 Additional Test Procedures... 13 Annex A (Informative) Comparison of Chapter and Article Numbers in this Standard and those in EN 1363‐2.1999... 21 Annex B (Informative) Technical Differences between this Standard and EN 1363‐2.1999 and their Reasons... 23 Annex C (Informative) Guide for Possible Application Scenarios of Different Fire Heating Curves... 25 Annex D (Informative) Application Guide for Spray Water Impact Test... 27ForewordThis 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 ScopeThis 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 ReferencesThe 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 DefinitionsFor 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 radiation4 Alternative Heating Curves4.1 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 Procedures5.1 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. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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