Composite Floor Decks - cistructures.co.uk

1 Precision Metal FormingSteel Floor Decking SystemsComposite Floor DecksShallow Composite Floor DecksFour different PMF profiles provide theoptimum solution for short to mediumunpropped or propped span conditions. Insteel construction the Composite Floor profileis placed on the top flange of the beam. The steel section is generally designed to act compositely with the Floor Composite Floor DecksPMF can offer two deep deck profiles that can span approximately six metres Deep Composite Decks are generally usedwith Slimdek construction, which is used inconjunction with the Asymmetric Slimflor Beam(ASB). The Composite Floor deck is supportedby the lower flange of the ASB, which is widerthan the top (non- Composite )Five steel profiles which act as permanentformwork, they remain in situ for the life of the building but, unlike Composite profiles,do not act as reinforcement in the concreteslab.

2 The five profiles range in height from 32 mm to 100mm to offer the optimumsolution to every Floor Decking The most comprehensive range of steel Floor decking systems available anywhere in the areas of deck can be rapidly craned intoposition and up to 400m2laid by one team perday. With minimal mesh reinforcement andpumped concrete, the completed Floor canquickly platform Once laid, the deck acts as a safe workingplatform for all following trades. Temporaryprops can usually be eliminated. Construction stage bracing The deck acts as lateral restraint to the beamsand acts as a diaphragm, transmitting windload from the outer steelwork to the core.

3 Thus once the decking is fixed, it contributessignificantly to the stability of the to the intrinsic efficiency of compositeconstruction and the displacement of concreteby the profile shape, considerably lessconcrete is used than in conventionalreinforced concrete construction. This reduces both the primary structure benefits of PMF Composite Floor DeckingHeightComposite beams use the slab as acompression element, which increases theirstiffness and reduces their size. The compositeslab itself has a very low centre ofreinforcement compared to a conventionallyreinforced slab and therefore does not needthe same savings translate to a reduced floorzone and thus overall Floor testing and fire engineering work byPMF and The Steel Construction Institute haveresulted in fire ratings of up to 4 hours beingavailable with the use of light mesh within thecomposite slab and no protection to the Composite Floor Decks incorporatesystems for the easy attachment of services.

4 Negating the requirement to fix into Floor Decks 1 PMF Deep Composite Floor Decks usedin Slimdek construction offer all thebenefits of shallow deck compositeconstruction, with some significantadditional span Decks The deck will be designed to span 6munpropped and up to 9m propped withcorresponding reduction in Floor depth The deck is contained within the beam depth,which produces a slim Floor . This leads tosavings in cladding costs and either helps toreduce the overall building height or enablesan extra Floor to be added for buildings of 10storys integration The shape of the deep Decks permits servicesto be installed between the deck ribs,effectively within the slab depth.

5 This leads to further reductions in the Floor fire resistanceA fire resistance of 60 minutes can beachieved without fire protection to thesteelwork or deep Composite Floor Floor DecksDesign DetailsConstruction DetailsInstallation GuidanceShallow CompositeFloor DecksComFlor 70 Optimum design, combinedtrapezoidal and re-entrant unpropped span 51 Traditional re-entrant unpropped span 46 Cost effective ultra nestable unpropped span 100 For European style, longer span,non Composite beam unpropped span 225 Longest span deck , used for Corus Slimdek unpropped span 210 Long span deck , can be used with Corus Slimdek unpropped span range12816363252 Deep Composite Floor DecksFormwork (non Composite )ReferencesHealth & SafetyTransport & HandlingDesign CdPage5440 - 4344 - 4748 - 51 Design DetailsConstruction DetailsInstallation Guidance20 - 2324 - 2728 - 31 Product SelectorProduct SelectorComposite Floor Decks 3 comflor 46 - From the PMF Shallow Composite Profile RangeComFlor 46, first introduced in 1985, is a simple trapezoidal Composite deck with a strong and reliable shear bond performance.

6 The profile is economic and nestable, reducingtransport and handling costs. ultra efficient nesting capability ofComFlor 46 reduces the transport volumeof the product. This fact combined with thesimplicity of comflor 46 also makes it idealfor export. Easy service and lightweight services can easilybe attached to the punched hangar tabs,which can be included with comflor must be specified at time of order. Low concrete usageThe trapezoidal shape profile of ComFlor46 reduces the volume of concrete used,with resultant savings in structural andfoundation 464 Composite Floor DecksComFlor 46 Design informationComFlor 46 Volume & weight table notes1.

7 deck and beam deflection ( ponding is notallowed for in the deck and mesh weight is not included in theweight of concrete Density of concrete is taken as:Normal weight (wet) 2400 kg/m2 Normal weight (dry) 2350 kg/m2 Lightweight (wet) 1900 kg/m2 Lightweight (dry) 1800 kg/m2 Section Properties (per metre width)NominalDesignHeight toMoment of Ultimate Moment capacitythicknessthicknessProfile weightArea of steelneutral axisinertia(kNm/m)(mm)(mm)(kN/m2)(mm2/m) (mm)(cm4/m) materialZinc coated steel to BS EN 10147:1992, Fe E 280G, Z275, with a guaranteed minimumyield stress of 280 N/mm2. Minimum zinc coatingmass is 275 g/m2total including both reference tablesThe quick reference load/span and fire designtables, on the following 2 pages are intended asa guide for initial design, based on theparameters stated below the tables.)

8 The PMFcalculation suite contained on the CD at the backof this literature provides a full design program. Please refer to page 56 for help on using meshBS 5950: Part 4 currently recommends that anti-crack mesh should comprise of slab Eurocode 4 recommendation is that anti-crack mesh should comprise of slab areafor unpropped spans and of slab area forpropped spans. PMF in conjunction with The Steel Construction Institute has agreed tomodify the requirement with regard to anti-crackmesh, to comply with the Eurocode 4recommendations. Accordingly, the mesh shownin the quick reference tables complies with EC4and the design program defaults to these EC4 mesh rules are used, the mesh maybe reduced midspan - see Design Information onpage 20.

9 The reduced British Standard meshvalues may still be used by overriding this defaultin the design top cover must be a minimum of 15mm,and a maximum of 30mm. Mesh laps are to be300mm for A142 mesh and 400mm for A193,A252 & A393 details of the performance of compositeslabs comprising comflor 46 decking under a fire condition with nominal anti-crack mesh,please refer to the quick reference fire load tablesin this brochure. For other simplified designcases or for full fire engineering, refer to thedesign servicesPMF Technical Department offer acomprehensive advisory service on design of Composite flooring, which is available to all specifiers and users.

10 Should queries arisewhich are not covered by this literature or by thedesign CD, please contact NotesFull design programon CD (inside back page) Composite Floor Decks5 comflor 46 Composite Slab - Volume & WeightWeight of Concrete (kN/m2 )ConcreteSlab Depthvolume Normal weight ConcreteLightweight Concrete(mm)(m3/m2)Wet Dry 46 Span table - Normal weight ConcreteMAXIMUM SPAN (m) deck Thickness (mm) Applied Load (kN/m2)(mm) deck2 deck2 46 comflor 46 Normal weight concrete- quick reference tables6 Composite Floor DecksNo Temporary props1 Line of Temporary propsComFlor 46 Span table - Lightweight ConcreteMAXIMUM SPAN (m) deck Thickness (mm) Applied Load (kN/m2)(mm) deck2 deck2 46 comflor 46 Lightweight concrete- quick reference tablesComposite Floor Decks7 MeshSee notes on previous centre to centre of deck material specification (see previous page).