《BS-8414-2-2005.pdf》由会员分享，可在线阅读，更多相关《BS-8414-2-2005.pdf（22页珍藏版）》请在三一文库上搜索。
1、BRITISH STANDARD BS 8414-2:2005 Fire performance of external cladding systems Part 2: Test method for non-loadbearing external cladding systems fixed to and supported by a structural steel frame ICS 13.220.50 ? BS 8414-2:2005 This British Standard was published under the authority of the Standards P
2、olicy and Strategy Committee on 6 October 2005 BSI 6 October 2005 The following BSI references relate to the work on this standard: Committee reference FSH/22/7 Draft for comment 04/30107486 DC ISBN 0 580 46754 6 Committees responsible for this British Standard The preparation of this British Standa
3、rd was entrusted by Technical Committee FSH/21, Reaction to fire tests and Technical Committee FSH/22, Fire resistance tests, to a joint working group from Subcommittees FSH/21/7, Large and intermediate scale tests, and FSH/22/7, Text procedures for partitions, upon which the following bodies were r
4、epresented: Architectural and Specialist Door Manufacturers Association of Building Component Manufacturers Ltd. Association of Interior Specialists British Plastics Federation British Rigid Urethane Foam Manufacturers Association British Textile Technology Group BRE (Building Research Establishment
5、)/LPC Laboratories Ceram Research Ltd. Engineered Panels in Construction EURISOL (UK Mineral Wool Association) European Phenolic Foam Association Fire Brigades Union Fire Safety Development Group Flat Glass Manufacturers Association Gypsum Products Development Association IFS (Institute of Fire Safe
6、ty) Office of the Deputy Prime Minister (ODPM) (represented by the BRE) Office of the Deputy Prime Minister (ODPM) Building Regulations Division RAPRA Technology Ltd. TIMSA Thermal Insulation Manufacturers UK Steel Association University College London University of Bath Warrington Fire Research Cen
7、tre Co-opted members Amendments issued since publication Amd. No.DateComments BS 8414-2:2005 BSI 6 October 2005 i Contents Page Committees responsibleInside front cover Forewordii 1Scope 1 2Normative references 1 3Terms and definitions 1 4Principle 2 5Test apparatus 2 6Test specimen 6 7Conditioning
8、7 8Procedure 7 9Post-test examination 7 10Test report 8 Annex A (normative) Structural steel test frame 9 Annex B (normative) Calibration of the heat source 11 Annex C (normative) Timber crib source 14 Bibliography 17 Figure 1 Schematic of test apparatus 3 Figure 2 Location of thermocouples for a cl
9、adding test 5 Figure A.1 Steel test frame 10 Figure B.1 Location of heat flux meters and thermocouples for calibration test 12 Figure B.2 Mean heat flux time profile for fuels other than cribs 14 Figure C.1 Elevation and plan of the combustion chamber 16 Table A.1 Section details 9 BS 8414-2:2005 ii
10、 BSI 6 October 2005 Foreword This British Standard has been prepared by a joint working group from Technical Committees FSH/21/7 and FSH/22/7 under the direction of FSH/21 and FSH/22. This British Standard was developed from BRE Fire Note 9 1, following a recommendation by the then House of Commons
11、Environment, Transport and Regional Affairs Committee on the potential risk of fire spread in buildings via external cladding systems 2. BS 8414, Fire performance of external cladding systems, consists of the following parts: Part 1: Test method for non-loadbearing external cladding systems applied
12、to the face of a building; and Part 2: Test method for non-loadbearing external cladding systems fixed to and supported by a structural steel frame. WARNING This British Standard calls for the use of substances and/or procedures that may be injurious to health if adequate precautions are not taken.
13、It refers only to technical suitability and does not absolve the user from legal obligations relating to health and safety at any stage. A British Standard does not purport to include all necessary provisions of a contract. Users of British Standards are responsible for their correct application. Co
14、mpliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 17 and a back cover. The BSI copyright notice displayed in this document indicates when the document w
15、as last issued. BS 8414-2:2005 BSI 6 October 2005 1 1 Scope This British Standard provides a test method for assessing the behaviour of non-loadbearing external cladding systems, such as curtain walling, glazed elements, infill panels and insulated composite panels, fixed to and supported by a struc
16、tural steel frame when exposed to a fully-developed (post-flashover) fire in a room, venting through an opening such as a window aperture that exposes the cladding to the effects of external flames, or from an external fire source. This method of test does not apply to non-loadbearing external rains
17、creen overcladding systems or external wall insulation systems applied to the face of a building, the fire testing of which are covered in BS 8414-1. This test does not cover exposure to radiant heat from a fire in an adjacent building. 2 Normative references The following referenced documents are i
18、ndispensable for the application of this document. For dated references, only the reference cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. BS EN ISO 13943, Fire safety Vocabulary. 3 Terms and definitions For the purposes of th
19、is British Standard, the terms and definitions given in BS EN ISO 13943 and the following apply. 3.1 collapse any part of the cladding system which falls away and becomes detached 3.2 combustible layer layer incorporated in the construction product which, if tested in isolation, would fail the non-
20、combustibility definition in Approved Document B:2004 3 3.3 damaged area total of those surface areas which have been affected permanently by fire under specified conditions NOTE 1 It is expressed in square metres. NOTE 2 Users of this term should specify the types of damage to be considered. This c
21、ould include, for example, loss of material, deformation, softening, melting, charring, combustion, pyrolysis or chemical attack. NOTE 3 This definition is taken from BS EN ISO 13943. 3.4 external cladding system complete cladding assembly NOTE This includes, for example, sheeting rails, fixings, ca
22、vities, insulation and weathering membranes, coatings, flashings or joints. 3.5 level 1 height 2 500 mm above the top of the combustion chamber opening in the test apparatus 3.6 level 2 height 5 000 mm above the top of the combustion chamber opening in the test apparatus 3.7 start temperature Ts mea
23、n temperature of the thermocouples at level 1 height during the five minutes prior to ignition of the heat source BS 8414-2:2005 2 BSI 6 October 2005 3.8 start time ts time when the temperature recorded by any external thermocouple at level 1 height equals or exceeds a 200 C temperature rise above T
24、s and remains above this value for at least 30 s 4 Principle The test method simulates a fully developed fire in a room abutting the external face of a building and venting through an aperture. In this test, the external cladding system is fixed to, and supported by, a structural steel frame, so as
25、to simulate the external face of a building in the form of a main face together with a return wing, with the cladding system attached in the manner specified by the test sponsor. At the base of the vertical system, an opening is provided through which the fire can vent. The extent of damage caused t
26、o the external cladding system is evaluated, particularly the ability of the external cladding system to resist the propagation of the fire upwards. Any falling debris and fire penetration from the external to internal face should also be assessed. 5 Test apparatus 5.1 Test facility 5.1.1 General. T
27、he test apparatus shall utilize a vertical structural steel frame (5.1.2), representative of a structural steel framed building, with a vertical main test wall and a vertical return wall (wing) at 90 angles to, and at one side of the main test wall. The main wall shall be provided with a combustion
28、chamber conforming to 5.1.5. The apparatus shall be capable of enduring the effects of the test procedure without itself suffering undue damage or distortion. NOTE An example of a typical test apparatus is shown in Figure 1. 5.1.2 Test frame, conforming to the requirements detailed in Annex A. 5.1.3
29、 Main wall. The vertical main wall shall extend at least 6.0 m above the top of the combustion chamber opening and shall be at least 2.8 m wide. 5.1.4 Return wall (wing). The vertical return wall (wing) shall be the same height as the main test wall and have a minimum width of 1 500 mm. The wing sha
30、ll be constructed perpendicular to the main test wall to allow a distance of 2600 100mm from the side of the opening on a finished face to the combustion chamber (see Figure 1). 5.1.5 Combustion chamber, positioned at the base of the main vertical test wall such that the fire can project through the
31、 opening at the base of the main vertical test wall. The top of the chamber opening shall be (2 000 100) mm above the base of the test facility and shall be (2 000 100) mm wide. The combustion chamber shall be capable of enduring the effects of the test procedure without itself suffering undue damag
32、e or distortion. The chamber shall be constructed in accordance with the dimensions shown in Figure C.1, including the provision of a robust lintel across the head of the chamber opening and a suitable solid platform to support the heat source. A suitable heat source as specified in 5.2 shall be ins
33、talled within the combustion chamber. 5.2 Heat source The heat source shall: a) be calibrated in accordance with Annex B; or b) be as specified in Annex C. NOTE The wooden crib described in Annex C has been found to meet the requirements of Annex B and may be used without conducting a calibration ex
34、ercise. A calibration exercise needs to be conducted in accordance with Annex B on all other heat sources such as gas burners. BS 8414-2:2005 BSI 6 October 2005 3 Dimensions in millimetres Figure 1 Schematic of test apparatus 260-100 2 000 100 2 000 1006 000 2 800 1 500 Main face Wing Combustion Cha
35、mber +0 BS 8414-2:2005 4 BSI 6 October 2005 5.3 Thermocouples 5.3.1 General All thermocouples shall be mineral insulated 1.5 mm (nominal) diameter thermocouples of Type K (Chromel/Alumel) with insulated junctions. At each specified level, temperatures shall be monitored using thermocouples placed in
36、 accordance with 5.3.2 and 5.3.3. 5.3.2 External thermocouples 5.3.2.1 General External thermocouples shall be positioned to a tolerance of 10 mm with the hot junction positioned (50 5) mm in front of the face of the system under investigation. 5.3.2.2 Position of external thermocouples at level 1 h
37、eight External thermocouples shall be located at level 1 height on: a) the main face of the faade, in positions on the centre line of the combustion chamber opening, and at distances of 500 mm and 1 000 mm each side of the centre line (five locations); and b) the side wing, at distances of 150 mm, 6
38、00 mm and 1 050 mm from the finished face of the cladding system on the main face (three locations) (see Figure 2). 5.3.2.3 Position of external thermocouples at level 2 height External thermocouples shall be located at level 2 height on: a) the main face of the faade, in positions on the centre lin
39、e of the combustion chamber opening and at distances of 500 mm and 1 000 mm each side of the centre line of the combustion chamber opening (five locations); b) the wing, at distances of 150 mm, 600 mm and 1 050 mm from the finished face of the cladding systems on the main face (three locations) (see
40、 Figure 2). BS 8414-2:2005 BSI 6 October 2005 5 Dimensions in millimetres Figure 2 Location of thermocouples for a cladding test Main face Wing Combustion Chamber 450 450 150 500 500 500 500 Tolerance on thermocouple locations 10 Level 2 Level 1 2 5002 500 Centre line of combustion chamber opening B
41、S 8414-2:2005 6 BSI 6 October 2005 5.3.3 Internal thermocouples Internal thermocouples shall be positioned at level 2 height to a tolerance of 10 mm. They shall be positioned at the mid-depth of each combustible layer (see 3.2). Thermocouples shall not be used for layers less than 10 mm thick. If th
42、e system contains cavities, thermocouples shall also be positioned at the mid-width of each cavity. Sealed cavities, such as those found in glazing systems shall not be broken and, therefore, no measurements can be taken. The internal thermocouples at level 2 height shall be positioned: a) on the ce
43、ntre line of the main test face and at distances of 500 mm and 1 000 mm each side of the centre line (five locations); and b) on the wing at distances of 150 mm, 600 mm and 1 050 mm from the finished face of the cladding systems on the main face (three locations). 5.4 Data acquisition system A data
44、acquisition system capable of recording data at minimum intervals of 10 s shall be connected to the instruments. 5.5 Audio visual equipment Video equipment shall be capable of providing a visual record of the condition of the full height of the test faces at a minimum of five minute intervals. Both
45、the internal and external faces of the test specimen shall be monitored. NOTE It is recommended that four cameras be used to cover the full height of both faces, both internally and externally. 5.6 Ambient condition monitoring equipment Equipment for monitoring wind speed such as an anemometer shall
46、 have an accuracy of 0.5 m/s for measuring the ambient air velocity at a height of (3 000 100) mm above the ground and another (1 000 10) mm from the centre line of the combustion chamber. 5.7 Timing device The timing device used, such as a clock, shall have an accuracy better than 5 s/h. 6 Test spe
47、cimen 6.1 General The external cladding system shall include all relevant components assembled and installed in accordance with the instructions of the test sponsor, in particular paying attention to 6.2. 6.2 Dimensions of the cladding system The cladding system shall be constructed in accordance wi
48、th the instructions of the test sponsor and shall be representative of end use installation, including corner and edge finishing details. NOTE The maximum thickness of the system is effectively limited only by the relevant frame design. See Annex A. The cladding system shall extend horizontally from
49、 the finished corner of the test sample, at least 2.4 m on the main test face and at least 1.2 m on the wing. The system shall extend from the base of the test facility to a height of at least 6.0 m above the top of the combustion chamber opening on both faces. The cladding system shall not obstruct the combustion chamber opening. If the cladding system does not offer any protection around openings such as windows and doorways in practice, the i