Structural ComFlor® 51+

ComFlor® 51+

Contemporary new design of the original British re-entrant profile

ComFlor® 51+ is a completely new profile that is the latest evolution of a long line of re-entrant profile design, the favoured profile shape for a vast number of projects in Britain since the 1970s.

Key benefits are:

  • Fire resistance and flat soffit.
  • Slab and beam performance.
  • Service attachment.

Click the logo above to download the BIM Object for this product.

  • Virtually flat soffit: For a clean aesthetic appeal.
  • Composite performance – floor slab: New embossments on ComFlor® 51+ give even better shear key.
  • Composite performance – beam: The classic re-entrant profile shape provides the most effective shear stud performance of all composite profiles.
  • Fire performance: The low intrusion of the re-entrant profile into the concrete allows a good fire rating from a relatively slim slab. The flat soffit provides excellent fire protection to the top flange of the beam.
  • Easy attachment for services: Dovetail grooves at 150mm centre offer the best possible anchorage for services underneath.

ComFlor® 51+ Composite slab - volume and weight (EC values)

    Weight of concrete (kN/m2)
Slab depth
(mm)
Concrete
volume
(m3/m2)
Normal weight concrete Lightweight concrete

Wet

Dry

Wet

Dry

101 0.091 2.27 2.18 1.82 1.73
110 0.100 2.50 2.40 2.00 1.90
120 0.110 2.75 2.64 2.20 2.09
130 0.120 3.00 2.88 2.40 2.28
140 0.130 3.25 3.12 2.60 2.47
150 0.140 3.50 3.36 2.80 2.66
160 0.150 3.75 3.60 3.00 2.85
170 0.160 4.00 3.84 3.20 3.04
180 0.170 4.25 4.08 3.40 3.23
190 0.180 4.50 4.32 3.60 3.42
200 0.190 4.75 4.56 3.80 3.61
250 0.240 6.00 5.76 4.80 4.56

Notes

1. Deck and beam deflection (ie, ponding) is not included in the table.

2. Deck and mesh weight is not included in the weight of concrete figures.

3. Eurocode density of concrete is taken as:

Normal weight (wet) 25 kN/m3
Normal weight (dry) 24 kN/m3
Lightweight (wet) 20 kN/m3
Lightweight (dry) 19 kN/m3

ComFlor® 51+ (S350) Section properties (per metre width)

ComFlor® 51+ (S350) Section properties (per metre width)

Nominal thickness (mm) Design thickness (mm) Cross section area (mm2/m) Profile weight (kN/m2) Height to neutral axis (mm) Moment of inertia
(cm4/m)
Ultimate moment capacity (kNm/m)
Sagging Hogging Sagging Hogging
0.90 0.86 1578 0.13 15.90 60.44 42.56 5.70 6.78
1.00 0.96 1762  0.14 16.50 67.09 50.49 6.78 8.17
1.20 1.16 2137 0.17 16.80 82.60 69.00 8.94 10.96

Section properties in the above table conform to BS 5950.

Design notes:

Deck material
Tata Steel Galvatite®, hot dip zinc coated steel to BS EN 10346 S280GD+Z275, with guaranteed minimum proof strength of 280N/mm2 and zinc coating of total mass 275g/m2 (including both sides). This is sufficient for internal floors in a non-aggressive environment, which satisfies the requirement in clause 4.2 BS EN 1994-1-1 - the exposed surfaces of the steel decking shall be adequately protected to resist the particular atmospheric conditions. A zinc coating, if specified, should conform to the requirements of BS EN 10346. The specification may be varied, depending on service conditions.

Anti-crack mesh
As a minimum requirement where the control of crack width is of no interest, BS EN 1994-1-1, 9.8.1(2) recommends that, where continuous slabs are designed as simply-supported in accordance with BS EN 1994-1-1, 9.4.2(5), the cross-sectional area of the anti-crack reinforcement above the ribs should be not less than 0.2% of the cross-sectional area of the concrete above the ribs for un-propped construction, and 0.4% of this cross-sectional area for propped construction. The mesh specified in the quick reference Eurocode tables, complies with this clause.

Where forklift truck (or other similar concentrated loading) is expected, 0.5% minimum percentage reinforcement should be used over the supports and the previous stated percentages elsewhere to control cracking. For further information refer to SCI AD150.

In accordance with Steel Construction Institute (SCI) P300 ‘Composite Slabs and Beams Using Steel Decking: Best Practice for Design and Construction, a nominal cover of 25mm is stated for an exposure level XC1, for all concrete cylinder strengths for both normal (C25/30 to C40/50) and lightweight concrete (LC25/28 to LC32/35). This nominal cover of 25mm is the minimum cover of 15mm plus a fixing tolerance of 10mm.

Supporting beam width
For all ComFlor® 46 load/span tables, the width of the support beam used is assumed to be 152mm.

Fire design
The capacity of a composite slab with nominal anti-crack mesh in fire is calculated in accordance with Steel Construction Institute NCCI PN005 ‘Fire resistance design of composite slab’. Two fire-design methods can be used in the ComFlor® 9 software, namely ‘Mesh and Deck Fire Method’ or ‘Bar Fire Method’. For further details of the performance of composite slabs with nominal anti-crack mesh in fire, please contact the technical team.

Design support
The Technical Department at Tata Steel offers a comprehensive advisory service on design of composite flooring, which is available to all specifiers and users. Should queries arise which are not covered by this literature or by the ComFlor® 9 software, please contact us.

Our Load Span tables are designed to optimise the span in the construction stage, with the minimum amount of anti-crack reinforcement required by the relevant design code, while also considering the minimum requirements for the various imposed loading and fire resistance periods.

For more information on our ComFlor® 51+ Load Span parameters see our product downloads below.

ComFlor® V9 Software analyses each of the ComFlor® composite floor decks in construction stage, service stage and for fire resistance, under a wide range of loading configurations.

Design principles are in accordance with the appropriate parts of BS 5950 : Part 4 (1994), Part 6 (1995), Part 8 (1991) For design to the Eurocodes, the design principles are in accordance with EN 1994-1-1 and EN 1994-1-2:Eurocode 4. The design checks performed by the program cover the construction stage, the normal design stage and fire.

The slab may be propped or unpropped during construction and may also span over one or more permanent or temporary supports. In the double span case, the spans may be equal or unequal. At the normal design stage, however, the slab is always assumed to be simply supported between permanent supports. The slab is assumed to span only in the direction of spanning of the decking i.e. two-way spanning floors are not covered.

How to download ComFlor® 9 Software

1) Download Version 9 here

2) Install Version 9

Terms and Conditions of Use

SELECTING "DOWNLOAD" BELOW CONSTITUTES YOUR ACCEPTANCE OF THESE TERMS AND CONDITIONS. PLEASE READ THEM CAREFULLY. IF YOU DO NOT AGREE WITH THEM, DO NOT DOWNLOAD OR USE THE SOFTWARE.

1. RIGHT TO USE

Subject to your acceptance of these Terms and Conditions as set forth on this page, you are hereby granted a non-exclusive, non-transferable right to use this Program for the sole purpose of assisting in the selection or specification of products described in the program. This Program, and all related rights and patents, copyrights, trade secrets and other intellectual property, are and shall remain the sole property of Tata Steel UK Limited ["Tata Steel"] or The Steel Construction Institute ["SCI"] . You agree not to copy, reverse compile or engineer, disassemble, or otherwise use this program, or permit others to do so, other than as specifically authorised in these Terms and Conditions.

2. UPDATES

The latest version of this program is available via the Download button at the base of this page.

3. TERMS AND CONDITIONS OF SUPPLY

THIS PROGRAM IS PROVIDED AS IS, WITH NO WARRANTIES, GUARANTEES, REPRESENTATIONS OR CONDITIONS. In no event shall Tata Steel be liable for any direct or indirect, consequential, special, financial or economic losses, damages, costs claims or expenses (including any loss of profits) howsoever arising whether due to negligence or otherwise associated with the use, or inability to use, this Program. Risk in the use of this Program lies solely with the user. Tata Steel standard "Terms and Conditions of Sale" apply to all products sold by Tata Steel.

We maintain a friendly technical help desk which is freely available to all Consulting Engineers, and Contractors to assist with all aspects of ComFlor® composite floor design. The services we offer include:

Design calculations
To assist the specifier, the team are able to provide design calculations, generally dictated by the construction stage condition, the load and span required for service and the fire resistance required for the slab. Our team can also help with specialised design issues such as point loads, requirements for anti crack mesh, openings, etc.

Vibration
ComFlor® composite floor decks can meet the most stringent vibration applications, such as those required for National Health Service operating theatres.

Software tools
Comprehensive ComFlor® 9 Software is free to download here. The ComFlor® 9 Software provides quick and easy calculations for different building categories, loads, fire performance, spans, vibration, point loads and line loads. Regular updates are sent to all registered users.

Fire design
The capacity of the composite slab in fire may be calculated using two methods, either ‘Mesh and Deck Fire Method’ (mesh only and no trough bar reinforcement) or ‘Bar Fire Method’ (trough bottom bar reinforcement only with no contribution from the mesh and profile).

Specification service
Our ComFlor® team are able to provide a comprehensive specification guidance to ensure the correct composite floor specification goes into the contract documents.

In-house CPD seminars
Primarily aimed at Engineers and Architects, these free seminars last around 50 minutes, ending with a question & answer session and are delivered by our experienced regional teams. Topics include:

  • Composite floor decking in construction.
  • Structural roof decking in construction.
  • Steel building envelope systems for non-domestic buildings.
  • Factory tour – Insulated Panel Line at Shotton works.

To request a CPD seminar please click here.


Product Downloads

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