FIRE DESIGN OF FIELDERS SLIMFLOR® CONSTRUCTION (BEAMS) This fact file assists designers with designing their Asymmetric Steel Beams for fire conditions. When undertaking a fire design for a SlimFlor® design both the slab and beam sections need to be considered. This fact file discusses the fire rating of the Asymmetric Steel Beams, for details on fire rating the CF210® slab refer to Fielders Fact File F.3.6b.
FIELDERS SLIMFLOR® SlimFlor® utilises Fielders CF210® flooring profile in conjunction with Asymmetric Steel Beam Sections (ASB) to provide a floor system with a reduced construction zone. It does this by combining the floor slab and supporting structure in the same plane, providing a lightweight, versatile, long spanning floor system.
ASYMMETRIC BEAMS Due to the nature of the CF210® resting on the bottom flange of the ASB and encasing the beam in concrete (leaving only the underside of the bottom flange exposed) the beam is provided with a degree of fire protection. This level is detailed in the Fielders Fact File F.3.5 – Asymmetric Beams for SlimFlor® Construction. To achieve higher levels of fire protection the bottom flange can be painted with an intumescent paint or covered with fire rated boards or vermiculite sprays. Specifications for the paint are detailed below.
SPECIFICATION, CERTIFICATION AND WARRANTY REQUIREMENTS FOR AKZONOBEL INTUMESCENT PAINT
• All materials, primer, intumescent, topcoat shall be obtained from one manufacturer AkzoNobel – International Paints • The ntumescent coating shall have been tested and assessed to the requirements of AS 1530.4 and AS 4100. • The intumescent coating shall have 3rd Party Certification (i.e. Certifire, LPCB). • All materials used shall be documented in the independent NATA laboratory assessment (i.e. BRANZ, Exova etc). • A 10 year warranty is offered in consideration of the durability guidelines in AS2312.
• Abrasive blast clean to Sa2.5 (ISO 8501-1:2007) or SSPC-SP10. If oxidation has occurred between blasting and application, the surface should be re-blasted to the specified visual standard. Surface defects revealed by the blast cleaning process, should be ground, filled, or treated in the appropriate manner. • A sharp, angular surface profile of 50-75 microns (2-3 mils). • All corners, edges should have a 2mm radius. • Stripe coats should be applied to all welds, lap joints, plate edges, corners, sharp edges, and any other areas. • All surfaces should be clean dry and free from any contamination prior to painting.
SERVICE PENETRATIONS Integration of services can be achieved by providing an opening through the beam midway between the ribs of the CF210® decking. The size and location of the web openings must meet the following requirements;
• Elongated openings up to 160 mm deep by 320 mm long centrally between the ribs over the middle half of the beam span, but not within 1500 mm from the supports.• Alternatively, provide circular openings up to 160 mm diameter, but not within 1000 mm from the supports. To offer fire protection through the void a fire collar can be placed around the pipe as shown in Figure F.3.6.2.
PLEASE CHECK WITH FIELDERS THAT YOU HAVE THE CURRENT FIELDERS FACT FILE FOR THIS TOPIC. Care has been taken to ensure that the design information herein is accurate, but Fielders Australia Pty Ltd and its agents do not accept responsibility for errors due to misinterpretation of the input data or of output information by the user. Design advice is provided as a recommendation only and is not a substitute for professional judgment. Damages for breach of any warranty conditions shall not extend to any consequential damages.
The information contained in this design advice remains the property of Fielder’s Australia and is submitted in strict confidence for the sole purpose of facilitating the exclusive specification and use of Fielders products. The information contained within this advice is based on testing conducted by and exclusive to Fielders profiles and cannot be assumed to apply to alternative products. Distribution of this and associated documents, is restricted to the following parties unless otherwise authorised by Fielders Australia.
REFERENCES; Fellinger, J.H.H & Twilt, L, Fire behavior of long span composite floor, Fire Safety Science – Proceedings of the 5th International Symposium, pp1093-1104, 1997. Booth, C., Fellinger, J.H.H & Twilt, L, Shallow floor construction with deep composite deck: from fire tests to simple calculation rules, HERON, Vol. 42, No. 3, 1997. The product information presented in this brochure is intended as a guide only. It is recommended that you obtain qualified expert advice when seeking confirmation of product application. More comprehensive information can be sourced from Specifying Fielders - KingFlor Manual and KingFlor Designer Suite Software.