R51+ Floor Deck
R51+ Floor Deck

Description

Updated from the original R51 product in 2018, this profile is available in S350 and S450 grades to provide the designer greater flexibility. R51+ is a traditional re-entrant profile commonly used on inner city multi-storey projects, where the structural zone and storey height is reduced, due to the relatively thin slab depth required to achieve a typical one hour fire rating. 

Benefits

• 102mm minimum slab depth

• Optimised to maximise structural efficiency of steel

• 150mm trough spacings provide flexibility for stud placement

• TAB-Deck™ fibre concrete option 

Gauges

• 0.8mm

• 0.9mm

• 1.0mm

• 1.2mm 

Specification

• 600mm cover width

• 52mm deep 

Steel Grade

• S350

• S450 

R51+ Floor Deck

Finishes

• Galvanised (Z275)

• HD (ZM310) 

Profile Properties

Nominal
Thickness mm
Design Thickness
(bare steel) mm
Depth of Profile
mm
Weight
kg/m²
Weight
kN/m²
Height of Neutral
axis mm
Area of Steel
mm²/m
Moment of Inertia
cm⁴/m
0.80.765212.020.11815.8146456.90
0.90.865213.540.13316.2165761.27
1.00.965215.010.14716.5184568.73
1.21.165217.980.17617222385.60

Section properties are calculated assisted by testing in accordance with Eurocode 3. 

Fire Insulation Thickness

Minimum Insulation Thickness (x) of Concrete (mm) 

Fire RatingNWCLWC
1 Hour
100100
1.5 Hours110105
2 Hours125115
3 Hours150135
4 Hours170150

The image and table above details the minimum insulation thickness required to suit fire design criteria in accordance with SCI PN005c-GB or BS5950 Part 8. 

R51+ Floor Deck

Concrete Volume and Weight

Slab Depth
mm
Volume of Concrete
m³/m²
Weight of Concrete (Normal Weight)
Wet (kN/m²)
Weight of Concrete (Normal Weight)
Dry (kN/m²)
Weight of Concrete (Lightweight)
Wet (kN/m²)
Weight of Concrete (Lightweight)
Dry (kN/m²)
1300.1213.032.912.432.31
1500.1413.533.392.832.70
2000.1914.784.593.843.65

Deflection – This table is based on concrete poured to a constant thickness and does not take account for deflection of the decking or supporting beams (as a guide, to account for the deflection of the decking, a concrete volume of span/250 should be added to the figures indicated). Concrete Weight – These tables indicate concrete weight only and do not include the weight of decking or reinforcement. Concrete weights are based on the concrete densities specified in BS EN 1991-1-1 as follows: Normal Weight Concrete – 2550kg/m. (wet) and 2450 kg/m. (dry). Lightweight Concrete – 2050kg/m. (wet) and 1950 kg/m. (dry). 

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