Schöck Isokorb® C-line type CM
CM
Products
Schöck Isokorb® type CM
The Schöck Isokorb® type CM is suitable for cantilevered reinforced concrete slabs. (C for concrete slab)
It transmits negative moment (M) and positive shear force.
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69
Schöck Isokorb® C-line type CM
Section/element arrangement
Balcony
CM
Interior slab
Schöck Isokorb® type CM with window wall systems
Balcony
Interior slab
Schöck Isokorb® type CM with steel studs, facing shell and insulation layer
in between
Position of Schöck Isokorb® type CM
The Schöck Isokorb® type CM should be located in the insulating layer.
Products
Orientation of the Schöck Isokorb® type CM
Attention: the Schöck Isokorb® type CM does not have a symmetrical design.
— The tension bar must be on top.
— Pay attention to installation orientation and show a cross-section view on the design drawings.
— The Schöck Isokorb® type CM has the same design at the balcony side and the interior slab side.
Element arrangement
Interior slab
Interior slab
Type CM
Support
1x type
CM-CC55
Balcony
type CM
type CM-CC40
Balcony
Schöck Isokorb® type CM Cantilever balcony
Schöck Isokorb® type CM Balcony with outer corners
Note:
— In the presence of horizontal loads, e.g. from earthquakes, Schöck Isokorb® module CEQ must be used.
70
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Schöck Isokorb® C-line type CM
Slab geometry/expansion joints
Recommended maximum cantilever length
The following maximum cantilever lengths "ℓ" are recommended in order to avoid excessive vibration in the balcony slab.
Concrete cover
for tension bars
CC = 40 mm
[1 9/16"]
180 mm
[7"]
190 mm
[7 1/2"]
200 mm
[7 7/8"]
1.95 m
[6'-5"]
2.1 m
[6'-10"]
1.88 m
[6'-2"]
CC = 55 mm
[2 3/16"]
max ℓ with Isokorb® height H
210 mm
[8 1/4"]
220 mm
[8 5/8"]
230 mm
[9"]
240 mm
[9 1/2"]
250 mm
[9 7/8"]
2.25 m
[7'-4"]
2.39 m
[7'-10"]
2.54 m
[8'-4"]
2.68 m
[8'-10"]
2.83 m
[9'-3"]
2.98 m
[9'-8"]
2.03 m
[6'-6"]
2.17 m
[7'-2"]
2.32 m
[7'-7"]
2.46 m
[8'-0"]
2.61 m
[8'-6"]
2.76 m
[9'-0"]
CM
Cantilever length for the structural calculations
The support of the balcony is assumed to be 100 mm [3 15/16"] from the Schöck Isokorb® insulating element at the interior slab
side.
H
Products
Interior slab
CC
h
Balcony
100 mm
[3 15/16"]
ℓ
Expansion gaps (recommended balcony length)
The expansion joint spacing shown below corresponds to a temperature difference of ∆T = 70 °C [126 °F].
≤ 5.65 m
≤ 11.30 m
[18'-6 7/16"]
[37'-0 7/8"]
Schöck dowel
type ESD
Schöck dowel
type ESD
Expansion joint
type CM
Expansion joint
type CM
l
type CV
type CM
Plan view: Maximum expansion joint spacing, Schöck Isokorb® type CM
Note:
— The maximum expansion joint spacing must be verified by the Engineer of Record (EOR).
— The expansion gap must be free to deform in the longitudinal direction. This can be achieved, for example, using a
Schöck Dorn ESD-K (made from stainless steel A4).
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71
Schöck Isokorb® C-line type CM
Concrete cover/type designation
Concrete cover CC
The concrete cover of the Schöck Isokorb® type CM is set to 40 mm [1 9/16"] (CC40) or 55 mm [2 3/16"] (CC55). We recommend
choosing the CC55 concrete covering for balcony slabs with a sloping surface. This allows the surface of the balcony slab to be
sloped by 2%.
Interior slab
40 mm
[1 9/16"]
Balcony
h
H
CM
80 mm
[3 1/8"]
ℓ
100 mm
[3 15/16"]
≥ 40 mm
[1 9/16"]
Balcony
55 mm
[2 3/16"]
Concrete cover with level balcony slab
80 mm
[3 1/8"]
ℓ
h
H
Products
≤2%
Interior slab
100 mm
[3 15/16"]
Concrete cover with sloped balcony slab
Type designation in design drawings
Schöck Isokorb® type
Concrete cover
Isokorb® height
CC = 40 mm [1 9/16"]
H
The following type designation specifies the Schöck Isokorb®
type that is required.
The type designation is indicated on the design drawings.
The type designation is printed on the sticker of the Schöck
Isokorb® type as a recognition feature.
Type designation in design drawings
With fire protection
CM20-CC40-VV1-H200-R120
Type/load capacity
Concrete cover
Shear load capacity
Schöck Isokorb® height
Fire protection
72
Ultimate [factored]
moment resistance
CM10
Suitable Slab
Thickness
units
CM20
CM30
Concrete Strength ≥ 27.5 MPa [4,000 psi]
180 mm
180 mm
kNm/m
-22.5
-28.4
-34.0
[7"]
[7"]
[kip-ft/ft]
[-5.1]
[-6.4]
[-7.7]
190 mm
190 mm
kNm/m
-25.0
-31.7
-37.8
[7 1/2"]
[7 1/2"]
[kip-ft/ft]
[-5.7]
[-7.1]
[-8.6]
200 mm
200 mm
kNm/m
-27.6
-34.8
-41.7
[8"]
[8"]
[kip-ft/ft]
[-6.2]
[-7.8]
[-9.4]
210 mm
210 mm
kNm/m
-30.1
-38.0
-45.5
[8 1/4"]
[8 1/2"]
[kip-ft/ft]
[-6.8]
[-8.5]
[-10.3]
Balcony
Interior slab
740 mm
[2'-5 1/8"]
80 mm
[3 1/8"]
740 mm
[2'-5 1/8"]
CC
CC = 40 mm
[1 9/16"]
H
20 mm [13/16"]
H = 200 mm
[7 7/8"]
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Schöck Isokorb® C-line type CM
Product cross-section
Balcony
Interior slab
740 mm
[2'-5 1/8"]
80 mm
[3 1/8"]
740 mm
[2'-5 1/8"]
40 mm [1 9/16"]
H
20 mm [13/16"]
414 mm
417 mm
[1'-4 5/16"]
[1'-4 7/16"]
H = 180 - 250 mm
[7 1/16"] - [9 13/16"]
CM
Product cross-section for Schöck Isokorb® type CM10 to CM40, concrete cover CC40
Balcony
Interior slab
740 mm
[2'-5 1/8"]
80 mm
[3 1/8"]
740 mm
[2'-5 1/8"]
55 mm [2 3/16"]
H
20 mm [13/16"]
417 mm
[1'-4 7/16"]
H = 200 - 250 mm
[7 7/8"] - [9 13/16"]
Products
414 mm
[1'-4 5/16"]
Product cross-section for Schöck Isokorb® type CM10 to CM40, concrete cover CC50
Schöck Isokorb® length and configuration
Schöck Isokorb® type
CM10
CM20
CM30
CM40
1.0 m [3'-3"]
1.0 m [3'-3"]
1.0 m [3'-3"]
1.0 m [3'-3"]
6 ø 12
8 ø 12
10 ø 12
12 ø 12
Shear force bars VV1
4 ø 8+4 ø 8
4 ø 8+4 ø 8
4 ø 8+4 ø 8
4 ø 8+4 ø 8
Shear force bars VV2
6 ø 8+6 ø 8
6 ø 8+6 ø 8
6 ø 8+6 ø 8
6 ø 8+6 ø 8
Pressure bearings VV1 (pcs.)
8
10
12
14
Pressure bearings VV2 (pcs.)
12
12
12
14
Isokorb® length
Tension bars
Note:
— The product cross-sections of the 4 load capacities (CM10, CM20,CM30,CM40) of the Schöck Isokorb® type CM are identical for
the respective concrete cover. The load capacities of the Schöck Isokorb® type CM vary in the number of tension bars, shear
force bars and HTE pressure bearings.
— The Schöck Isokorb® type CM may be split at the non-reinforced locations. The spacing of the pressure elements from the free
edge of the reinforced concrete slab must be at least 50 mm [2"], and the axis spacing of the shear force bars must be at least
100 mm [4"] and no more than 150 mm [6"].
— The shear force bars have differing lengths as shown in brackets
— The Schöck Isokorb® consists of metric components.
— reinforcement bars ø 8 correspond to 5/16"
— reinforcement bars ø 12 correspond to 1/2"
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73
Schöck Isokorb® C-line type CM
Overhead view of product
Balcony
Interior slab
75 mm [2 15/16"]
100 mm [3 15/16"]
200 mm [7 7/8"]
150 mm [5 7/8"]
200 mm [7 7/8"]
150 mm [5 7/8"]
1000 mm [3'-3 3/8"]
200 mm [7 7/8"]
250 mm [9 13/16"]
400 mm [1'-3 3/4"]
200 mm [7 7/8"]
CM
150 mm [5 7/8"]
200 mm [7 7/8"]
200 mm [7 7/8"]
150 mm [5 7/8"]
200 mm [7 7/8"]
100 mm [3 15/16"]
Products
75 mm [2 15/16"]
414 mm
414 mm
[1'-4 5/16"]
[1'-4 5/16"]
740 mm
[2'-5 1/8"]
80 mm
[3 1/8"]
740 mm
[2'-5 1/8"]
Overhead view of Schöck Isokorb® type CM10
Balcony
Interior slab
75 mm [2 15/16"]
100 mm [3 15/16"]
200 mm [7 7/8"]
100 mm [3 15/16"]
200 mm [7 7/8"]
100 mm [3 15/16"]
200 mm [7 7/8"]
100 mm [3 15/16"]
1000 mm [3'-3 3/8"]
250 mm [9 13/16"]
400 mm [1'-3 3/4"]
100 mm [3 15/16"]
200 mm [7 7/8"]
200 mm [7 7/8"]
100 mm [3 15/16"]
200 mm [7 7/8"]
100 mm [3 15/16"]
200 mm [7 7/8"]
100 mm [3 15/16"]
75 mm [2 15/16"]
414 mm
414 mm
[1'-4 5/16"]
[1'-4 5/16"]
740 mm
[2'-5 1/8"]
80 mm
[3 1/8"]
740 mm
[2'-5 1/8"]
Overhead view of Schöck Isokorb® type CM20
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Schöck Isokorb® C-line type CM
Overhead view of product
Balcony
Interior slab
75 mm [2 15/16"]
100 mm [3 15/16"]
200 mm [7 7/8"]
100 mm [3 15/16"]
200 mm [7 7/8"]
100 mm [3 15/16"]
200 mm [7 7/8"]
100 mm [3 15/16"]
50 mm [1 15/16"]
1000 mm [3'-3 3/8"]
150 mm [5 7/8"]
400 mm [1'-3 3/4"]
200 mm [7 7/8"]
CM
50 mm [1 15/16"]
100 mm [3 15/16"]
200 mm [7 7/8"]
100 mm [3 15/16"]
200 mm [7 7/8"]
100 mm [3 15/16"]
200 mm [7 7/8"]
100 mm [3 15/16"]
75 mm [2 15/16"]
414 mm
414 mm
[1'-4 5/16"]
[1'-4 5/16"]
740 mm
[2'-5 1/8"]
80 mm
[3 1/8"]
Products
740 mm
[2'-5 1/8"]
Overhead view of Schöck Isokorb® type CM30
Balcony
Interior slab
75 mm [2 15/16"]
100 mm [3 15/16"]
50 mm [1 15/16"]
200 mm [7 7/8"]
100 mm [3 15/16"]
200 mm [7 7/8"]
50 mm [1 15/16"]
200 mm [7 7/8"]
100 mm [3 15/16"]
50 mm [1 15/16"]
1000 mm [3'-3 3/8"]
150 mm [5 7/8"]
400 mm [1'-3 3/4"]
200 mm [7 7/8"]
50 mm [1 15/16"]
100 mm [3 15/16"]
200 mm [7 7/8"]
50 mm [1 15/16"]
200 mm [7 7/8"]
100 mm [3 15/16"]
50 mm [1 15/16"]
200 mm [7 7/8"]
100 mm [3 15/16"]
75 mm [2 15/16"]
414 mm
414 mm
[1'-4 5/16"]
[1'-4 5/16"]
740 mm
[2'-5 1/8"]
80 mm
[3 1/8"]
740 mm
[2'-5 1/8"]
Overhead view of Schöck Isokorb® type CM40
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75
Schöck Isokorb® C-line type CM
Design
Product selection table as per ACI 318-11
Concrete cover CC = 40 mm [1 9/16"]
Schöck Isokorb® type
Concrete cover
Isokorb® height
CC = 40 mm [1 9/16"]
H
180 mm
CM
CM20
CM30
CM40
Suitable Slab
Thickness
units
180 mm
kNm/m
-22.5
-28.4
-34.0
-39.7
Concrete Strength ≥ 27.5 MPa [4,000 psi]
[7"]
[7"]
[kip-ft/ft]
[-5.1]
[-6.4]
[-7.7]
[-8.9]
190 mm
190 mm
kNm/m
-25.0
-31.7
-37.8
-44.1
[7 1/2"]
[7 1/2"]
[kip-ft/ft]
[-5.7]
[-7.1]
[-8.6]
[-9.9]
200 mm
200 mm
kNm/m
-27.6
-34.8
-41.7
-48.6
[8"]
[8"]
[kip-ft/ft]
[-6.2]
[-7.8]
[-9.4]
[-10.9]
210 mm
210 mm
kNm/m
-30.1
-38.0
-45.5
-53.0
[8 1/4"]
[8 1/2"]
[kip-ft/ft]
[-6.8]
[-8.5]
[-10.3]
[-11.9]
220mm
220 mm
kNm/m
-32.6
-41.2
-49.3
-57.5
[8 5/8"]
[8 3/4"]
[kip-ft/ft]
[-7.3]
[-9.3]
[-11.1]
[-12.9]
230 mm
230 mm
kNm/m
-35.1
-44.4
-53.1
-61.9
[9"]
[9"]
[kip-ft/ft]
[-7.9]
[-10.0]
[-12.0]
[-13.9]
240 mm
240 mm
kNm/m
-37.7
-47.5
-57.0
-66.4
[9 1/2"]
[9 1/2"]
[kip-ft/ft]
[-8.4]
[-10.7]
[-12.8]
[-14.9]
250 mm
250 mm
kNm/m
-40.2
-50.6
-60.8
-70.9
[9 7/8"]
[10"]
[kip-ft/ft]
[-9.0]
[-11.4]
[-13.7]
[-15.9]
Ultimate [factored]
shear Strength øVn VV1
180 -250 mm
–
kN/m
±52.5
±52.5
±52.5
±52.5
[7" - 9 7/8"]
–
[kips/ft]
[±3.6]
[±3.6]
[±3.6]
[±3.6]
Ultimate [factored]
shear Strength øVn VV2
180 -250 mm
–
kN/m
±78,75
±78,75
±78,75
±78,75
[7" - 9 7/8"]
–
[kips/ft]
[±5,4]
[±5,4]
[±5,4]
[±5,4]
For Sl: 1 inch = 25.4 mm, 1 lbf = 4.448 N, 1 psi = 0.006897 MPa
For pound-inch units: 1 mm = 0.03937 inches, 1 N = 0.2248 lbf, 1 MPa = 145.0 psi
The support is assumed to be 100 mm [4"] from the Schöck
Isokorb® insulating element at the interior slab side.
+ V
M
H
CC
Support
h
Products
Ultimate [factored]
moment resistance
ΦMn
CM10
ℓ
76
100 mm
[3 15/16"]
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Schöck Isokorb® C-line type CM
Design
Product selection table as per ACI 318-11
Concrete cover CC = 55 mm [2 3/16"]
CM10
CM20
CM30
CM40
Suitable Slab
Thickness
units
200 mm
kNm/m
-24.6
-31.0
-37.2
-43.4
[8"]
[8"]
[kip-ft/ft]
[-5.5]
[-7.0]
[-8.4]
[-9.8]
210 mm
210 mm
kNm/m
-27.0
-34.0
-40.8
-47.6
[8 1/4"]
[8 1/2"]
[kip-ft/ft]
[-6.0]
[-7.7]
[-9.2]
[-10.7]
220mm
220 mm
kNm/m
-29.4
-37.0
-44.4
-51.8
[8 5/8"]
[8 3/4"]
[kip-ft/ft]
[-6.6]
[-8.4]
[-10.0]
[-11.7]
230 mm
230 mm
kNm/m
-31.8
-40.0
-48.0
-56.1
[9"]
[9"]
[kip-ft/ft]
[-7.1]
[-9.0]
[-10.8]
[-12.6]
240 mm
240 mm
kNm/m
-34.2
-43.0
-51.6
-60.3
[9 1/2"]
[9 1/2"]
[kip-ft/ft]
[-7.7]
[-9.7]
[-11.6]
[-13.6]
250 mm
250 mm
kNm/m
-36.6
-46.0
-55.2
-64.5
[9 7/8"]
[10"]
[kip-ft/ft]
[-8.2]
[-10.4]
[-12.4]
[-14.5]
Ultimate [factored]
shear Strength øVn VV1
180 -250 mm
–
kN/m
±52.5
±52.5
±52.5
±52.5
[7" - 9 7/8"]
–
kips/ft
[±3.6]
[±3.6]
[±3.6]
[±3.6]
Ultimate [factored]
shear Strength øVn VV2
180 -250 mm
–
kN/m
±78,75
±78,75
±78,75
±78,75
[7" - 9 7/8"]
–
kips/ft
[±5,4]
[±5,4]
[±5,4]
[±5,4]
200 mm
Ultimate [factored]
moment resistance
ΦMn
Concrete Strength ≥ 27.5 MPa [4,000 psi]
CM
Products
Schöck Isokorb® type
Concrete cover
Isokorb® height
CC = 55 mm [2 3/16"]
H
For Sl: 1 inch = 25.4 mm, 1 lbf = 4.448 N, 1 psi = 0.006897MPa
For pound-inch units: 1 mm = 0.03937 inches, 1 N = 0.2248 lbf, 1 MPa = 145.0 psi
Notes
With different balcony slab and floor slab concrete qualities, the weaker concrete should be used with the tables above.
The Engineer of Record (EOR) must confirm strength of the slabs at both sides of the Schöck Isokorb®.
The shear capacity of the slabs to be verified by the Engineer of Record (EOR).
For seismic loads the Schöck Isokorb® CM has to be combined with the Schöck Isokorb® type CEQ.
The capacities are considering a maximum permitted bar separation according ACI 381-11. This has to be taken into account by
the Engineer of Record (EOR).
— The example load distribution assumes stiff slab edges which imply only downward loadings at the connection at the balcony.
For that case Schöck Isokorb® type CM is the solution.
—
—
—
—
—
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77
Schöck Isokorb® C-line type CM
Cast-in-place reinforcement
The cast-in-place reinforcement, is defined by the Engineer of Record (EOR) of the building in accordance with structural
requirements. The tension bars of the Schöck Isokorb® type CM must be overlapped with the tensile reinforcement (Pos. 1).
Positions 2 (longitudinal edge reinforcement), Pos. 3 (U-Bars) and Pos. 4 (U-Bars for the free balcony edges) must also be
provided. Following is a suggestion for the reinforcement layout.
Cross-section
f'c ≥ 27.5 MPa (4,000 psi)
Balcony
Pos. 1
CM
A
Pos. 6
Pos. 2
Pos. 3
Pos. 3
Pos. 5
Upper balcony reinforcement (EOR)
A
Pos. 6
Upper slab reinforcement (EOR)
Pos. 1
Pos. 6
Pos. 5
Pos. 6
Pos. 3
Products
f'c ≥ 27.5 MPa (4,000 psi)
Interior Slab
Pos. 1
Pos. 2
Pos. 2
Pos. 3
≥ 410 mm [1'-4 1/8"]
≥ 410 mm [1'-4 1/8"]
Pos. 6
Pos. 6
Lower balcony reinforcement (EOR)
Pos. 5
Lower slab reinforcement (EOR)
Cross section of recommended slab reinforcement (supplied by building contractor)
Plan View
Section A-A (Free edge)
Tension bars, Isokorb®
Shear force bars, Isokorb®
Pos. 1
Interior Slab
Pos. 6
A
A
type CM
Balcony
Pos. 4
Pressure bearings, Isokorb®
Upper reinforcement (EOR)
Pos. 3
Pos. 5
Pos. 1
Pos. 6
Pos. 4
Lower reinforcement (EOR)
Pos. 5
Section A-A Depiction of free balcony edge
78
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Schöck Isokorb® C-line type CM
Cast-in-place reinforcement, indirect support
Suggestion for cast-in-place connective reinforcement for 100% design strength with minimum concrete strength of 27.5 MPa
[4,000 psi].
The existing slab reinforcement can be taken into account for the required reinforcement of connections with Schöck Isokorb®.
Schöck Isokorb® type
CM10
CM20
CM30
CM40
Units
Pos 1: Overlapping reinforcement
Required cross-section area as [in² / 1.0 ft width]
mm² / 1.0 m width
680
910
1130
1360
[in² / 1.0 ft width]
[0.32]
[0.43]
[0.53]
[0.64]
#4 @ 150 mm
#4 @ 125 mm
#4 @ 100 mm
#5 @ 125 mm
[#4 @ 6"]
[#4 @ 5"]
[#4 @ 4"]
[#5 @ 5"]
#5 @ 250 mm
#5 @ 200 mm
#5 @ 150 mm
#6 @ 200 mm
[#5 @ 10"]
[#5 @ 8"]
[#5 @ 6"]
[#6 @ 8"]
mm
562
562
562
562
Alternative 1
Alternative 2
CM
Required lap splice length Pos.1
Minimum [in]
[in]
[22"]
[22"]
[22"]
[22"]
mm
700
700
700
700
[in]
[27 1/2"]
[27 1/2"]
[27 1/2"]
[27 1/2"]
Alternative 1
4 x #3
4 x #3
4 x #3
4 x #3
Alternative 2
4 x #5
4 x #5
4 x #5
4 x #5
#3 @ 300 mm
#3 @ 300 mm
#3 @ 250 mm
#3 @ 200 mm
[#3 @ 12"]
[#3 @ 12"]
[#3 @ 10"]
[#3 @ 8"]
#5 @ 350 mm
#5 @ 350 mm
#5 @ 300 mm
#5 @ 300 mm
[#5 @ 14"]
[#5 @ 14"]
[#5 @ 12"]
[#5 @ 12"]
provided by Schöck Isokorb® [in]
Products
Pos 2: Longitudinal edge reinforcement
Pos 3: U-Bars for the slab edges
Alternative 1
Alternative 2
Pos 4: U-Bars for the free balcony edge
Required cross-section area as
mm² / 1.0 m width
[in² / 1.0 ft width]
In accordance with EOR specifications
Pos 5: Reinforcement bottom layer
Required cross-section area as
mm² / 1.0 m width
[in² / 1.0 ft width]
In accordance with EOR specifications
Pos 6: Longitudinal reinforcement
Required cross-section area as
mm² / 1.0 m width
[in² / 1.0 ft width]
In accordance with EOR specifications
Notes
— The shown usage of Schöck Isokorb® type CM in balconies assumes stiff slab edges to ensure only shear forces affecting the
connection and no field moment. The formation of stiff slab edges is not shown in the following recommendations.
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79
Schöck Isokorb® C-line type CM
Cast-in-place reinforcement, indirect support
Notes:
Products
CM
— Pos. 1 must run as close as possible to the thermal insulation at both sides of the Schöck Isokorb®, taking the required concrete
cover into consideration.
— Pos. 4 should be chosen such that the U-bars can be arranged between the legs of Pos. 3.
— All free edges must be bordered using structural U-bars as per Engineer of Record (EOR) specifications.
— The centerline distance of any pressure element from any free concrete edge, including expansion joints, must be at least
50 mm [2"].
— The centerline distance of any tension or shear bar from any free concrete edge, including expansion joints, must be at least
50 mm [2"].
— The lap splice length provided by Schöck Isokorb® = the length of the tension bar from the face of the Isokorb® to the free end
- Concrete Cover (CC).
80
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Schöck Isokorb® C-line type CM
Deformation/camber
The deformation values in the table (tan α [%]) result from the deformation of the Schöck Isokorb® under service loads. They are
used to estimate the required camber. The mathematical camber of the balcony slab formwork results from the deflection as per
ACI 381-11 plus the deformation w2 from the Schöck Isokorb®. The camber of the balcony slab formwork to be specified by the
Engineer of Record (EOR) in the design drawings (e.g. calculated overall deformation from balcony slab w1 + interior slab angle of
rotation + Schöck Isokorb® w2) should be rounded such that the planned drainage direction is achieved (e.g. round up for
drainage towards building façade; round down for drainage towards end of cantilever slab). The given equation and tan α values
are for the service load case (1.0DL + 1.0LL). The designing engineer should also consider additional long term deflections as per
ACI 381-11 .
Deformation (w2) as a result of Schöck Isokorb®
1.0 DL
× 1
100
CM
1.0 LL
Support
H
tan α = obtain value from table below
ℓ
= Cantilever length [in]
M
= Nominal (unfactored) moment resistance [kip-ft/ft]
The load combination to be used here is defined by the
Engineer of Record (EOR).
øMn = Ultimate (factored) moment resistance [kip-ft/ft] of the
Schöck Isokorb® type CM (see page 77).
CC
1.0 DL
h
w2 [in] = tan α × ℓ ×
M
M
ø n
1.5
100 mm
[3 15/16"]
ℓ
Products
Deformation factors tan α
Concrete cover CC = 40 mm
Schöck Isokorb® type
Deformation factors tan α
CC = 40 mm [1 9/16"]
Isokorb® height H
CM10
CM20
CM30
CM40
180 mm [7"]
1.1
1.1
1.1
1.1
190 mm [7 1/2"]
1.0
1.0
1.0
1.0
200 mm [7 7/8"]
0.9
0.9
0.9
0.9
210 mm [8 1/4"]
0.8
0.8
0.8
0.8
220mm [8 5/8"]
0.8
0.8
0.8
0.8
230 mm [9"]
0.7
0.7
0.7
0.7
240 mm [9 1/2"]
0.7
0.7
0.7
0.7
250 mm [9 7/8"]
0.6
0.6
0.6
0.6
Deformation factors tan α
CC = 55 mm [2 3/16"]
Schöck Isokorb® type
Deformation factors tan α
CC = 55 mm [2 3/16"]
CM10
CM20
CM30
CM40
200 mm [7 7/8"]
1.1
1.1
1.1
1.1
210 mm [8 1/4"]
1.0
1.0
1.0
1.0
220mm [8 5/8"]
0.9
0.9
0.9
0.9
230 mm
0.8
0.8
0.8
0.8
240 mm [9 1/2"]
0.8
0.8
0.8
0.8
250 mm [9 7/8"]
0.7
0.7
0.7
0.7
Isokorb® height H
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81
Schöck Isokorb® C-line type CM
Checklist for Professional Engineer for signing and sealing
Products
CM
~
Has the recommended maximum cantilever length for the selected height of the Schöck Isokorb® been taken into
consideration?
~
Has the system cantilever length "ℓ" used for the design?
~
Have the factored member forces at the Schöck Isokorb® connection been determined at design level?
~
Has the critical concrete strength been taken into consideration in the choice of design table?
~
Has an appropriate concrete cover been selected and used with the calculation tables?
~
Have both slabs adjacent to the Isokorb® been verified for bending and shear capacities by the Engineer of Record (EOR)?
~
Has the additional deformation as a result of the Schöck Isokorb® been taken into consideration in the deformation
calculations of the overall structure?
~
Has the required camber been specified in the design drawings? Was the drainage direction taken into consideration in the
camber specification?
~
Have the requirements with regard to fire protection been determined, and has the relevant suffix (-R90 or R120) been
added to the Isokorb® type designation in the design drawings?
~
Has the outer corners been designed using Schöck Isokorb® type CM-CC 40 and Schöck Isokorb® type CM-CC 55.
~
Has the maximum permissible expansion gap spacing been taken into consideration for the specific slab configuration?
~
Have the horizontal loads such as those from earthquakes been taken into consideration? Additional CEQ modules may be
required.
~
Has the connecting reinforcement in the balcony and interior slabs been defined by the Engineer of Record (EOR)?
~
When using type CM and fully prefabricated parts, has the cast-in-place strip of concrete (width ≥ 50 mm [2"] from pressure
bearing elements) that is required to create the tight fit of the HTE pressure bearing been drawn into the design plans?
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