Cofraplus 60 Load Span tables - PGA Consultants

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Composite floor decks
Cofraplus 60
TECHNICAL CHARACTERISTICS OF THE STANDARD VERSION FLOOR
Properties of the floor deck
Nominal thickness of the sheet metal t mm 0,75 0,88 1,00 1,25
Weight per square metre
daN/m 2
8,53
10,00
11,37
14,22
Effective section :
A cm 2 /ml 10,29
12,17
13,91
17,57
Second moment of area : i
cm 4 /ml 55,12
65,21
74,53
93,94
Neutral axis position : v i
cm
3,33
3,33
3,33
3,33
Section modulus :
I/v i cm 3 /ml 16,55
19,58
22,38
28,20
Nominal concrete consumption
Thickness d
Volume in litres
Theoretical weight
of concrete alone *
mm 100 110 120 130 140 150 160 180 200 240 280
l/m 2 65 75 85 95 105 115 125 145 165 205 245
kN/m 2 1,55 1,79 2,03 2,27 2,51 2,75 2,99 3,47 3,95 4,91 5,87
* To obtain the total weight of the slab, add the weight of the concrete due to deflection and the weight of the profile.
Bulk density of the concrete 2400 daN/m 3 .
Characteristics of the floor across the span
Thickness d
For t = 0,75 mm
distance d-v i
Distance x
l 15
z
Thickness d
For t = 1,00 mm
distance d-v i
Distance x
l 15
z
mm
cm
cm
cm 4 /m
cm
mm
cm
cm
cm 4 /m
cm
100 110 120 130 140 150 160 180 200 240 280
6,67
3,25
252
5,59
7,67
3,56
329
6,48
8,67
3,90
421
7,39
9,67
4,13
527
8,29
10,67
4,40
649
9,20
11,67
4,65
786
10,12
12,67
4,90
938
11,04
6,67
3,59
309
5,47
7,67
3,94
404
6,36
8,67
4,28
517
7,24
9,67
4,60
648
8,14
10,67
4,90
799
9,04
11,67
5,20
969
9,94
12,67
5,48
1159
10,84
14,67
5,36
1289
12,88
16,67
5,79
1705
14,74
20,67
6,59
2731
18,47
24,67
7,31
4024
22,23
100 110 120 130 140 150 160 180 200 240 280
14,67
6,01
1600
12,67
16,67
6,51
2123
14,50
20,67
7,43
3424
18,19
24,67
8,27
5073
21,91
Notation
• d : thickness of the slab, including steel floor profile
• v i : distance of the neutral axis of the steel floor profile to its lower surface
• x : distance of the neutral axis of the slab to its upper surface
• l 15 : equivalent combined inertia in steel corresponding to E a /E b = 15
• z : conventional lever arm (d-v i - x/3)
Permissible shear between metal sheet and concrete
τ = T / 100 . z ≤ m . ρ d/L + k
with
ρ = ratio of the sheet metal section to the effective concrete section
(height d-v i )
L = calculation span in cm
m
k
d
The values of “m” et de “k” are given in
the unit system : length in cm, force in daN.
Strength
3238
0,1286
Static
load
1775
0,5302
Slide
Dynamic
load
1420
0,4242
x
Vi
Fire resistance
FR : fire resistance grade of the concrete subfloor.
A minimum thickness is required in order to meet the unexposed
surface temperature criteria.
FR required
d mini in cm
60’
11
90’
12
120’
14
180’
17
In the absence of special reinforcement Cofraplus floor achieves FR 30’ grade. For higher FR grades, the resistance of the floor for
the required fire exposure time must be justified by taking into account only the additional reinforcement provided to the slab.
Acoustic insulation
The acoustic behaviour of the subfloor corresponds to mass law. (values calculated by modelling)
Thickness d in mm
100
110
120
130
140
150
200
240
280
Rw (C;Ctr)
44 (-1;-3)
45 (-1;-4)
46 (-1;-4)
47 (-1;-4)
48 (-1;-5)
48 (-1;-4)
52 (-2;-6)
54 (-1;-7)
56 (-1;-7)
4