ComFlor 51

From the Panels and profiles shallow composite profile range

ComFlor 51 is a traditional dovetail re-entrant composite floor deck. This profile provides an excellent mechanical key into the concrete slab, offering a strong shear bond performance, which is augmented by cross stiffeners located in the profile trough. ComFlor 51 presents a virtually flat soffit and a relatively thin slab is required to meet fire design requirements.

Shear studs
The wide trough of ComFlor 51 permits a flexible and efficient placement of shear studs.

Fire performance of the composite beams
Even for two hours fire rating, the top flange of the steel beam does not require fire protection, when used with ComFlor 51 composite deck.

Under floor services
Services are easy to attach to ComFlor 51, with the ribs presenting a dovetailed recessed groove in the concrete slab at 152.5 mm centres. This provides the perfect connection for service hangars via a wedge nut or similar type device.

Fire performance of the slab
The dovetail presents a very small opening and contributes little to the transfer of heat through the slab in the event of fire. Thus a lesser slab depth is needed for fire design purposes.

Design material

Volume and weight table notes

1. Deck and beam deflection (i.e. ponding is not allowed for in the table).
2. Deck and mesh weight is not included in the weight of concrete figures.
3. 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/m

Deck material
Zinc coated steel to BS EN 10147:1992, Fe E 350G, Z275, with a guaranteed minimum yield stress of 350 N/mm². Minimum zinc coating mass is 275 g/m² total including both sides.

Quick reference tables
The quick reference load/span and fire design tables, on the following two pages are intended as a guide for initial design, based on the parameters stated below the tables.

Anti-crack mesh
BS 5950: Part 4 currently recommends that anti-crack mesh should comprise 0.1% of slab area. The Eurocode 4 recommendation is that anti-crack mesh should comprise 0.2% of slab area for unpropped spans and 0.4% of slab area for propped spans. Panels and Profiles, in conjunction with The Steel Construction Institute, has agreed to modify the requirement with regard to anti-crack mesh, to comply with the Eurocode 4 recommendations. Accordingly, the mesh shown in the quick reference tables complies with EC4 and the design program defaults to these values. Where EC4 mesh rules are used, the mesh may be reduced midspan. The reduced British Standard mesh values may still be used by overriding this default in the design program. Mesh top cover must be a minimum of 15 mm, and a maximum of 30 mm. Mesh laps are to be 300 mm for A142 mesh and 400 mm for A193, A252 & A393 mesh.

Fire
For details of the performance of composite slabs comprising ComFlor 51 decking under a fire condition with nominal anti-crack mesh, please refer to the quick reference fire load tables.

Technical services
Corus Panels and Profiles' Technical Department offer a comprehensive advisory service on design of composite flooring, which is available to all specifiers and users.

Normal weight concrete - quick reference guide
For Comflor 51 span tables please click here or click on the related item on the right of this page.

Lightweight concrete - quick reference guide
For Comflor 51 span tables please click here or click on the related item on the right of this page.

Fibredeck fire performance
For information on Fibredeck fire performance please click here or click on the related item on the right of this page.