COEM Ribbed Bar (CRB)

COEM Ribbed Bar (CRB) Smart alternative to cogged bar and “key boxes” for

precast and insitu connections

Wide Range AvailableCOEM stock a wide range of ferrule inserts, couplers and accessories.

Complies to Australian StandardsOur products tested and comply to Australian Standards

All testing done in Australia by NATA Certified LabAll products are batch tested by independent certified facilities as per Australian standards

constructionoem.com.au Source – Everything That Touches Concrete

COEM Ribbed Bar (CRB) is a reinforcement bar where the ribs act as a thread. This allows the bar to be cut at any point and to fit various threaded inserts, couplers, ferrules etc.

This provides greater flexibility than other traditional reinforcement methods, creating significant labour savings onsite.

Depth, Edge Distance Effects

The design strength of the anchoring system is dependent on:

A. Minimum Edge distances: Edge distances to be taken into account refer to Table (Table A) for details on calculator procedure (Tension shear capacity)

B. COEM CRB Inserts are designed to provide appropriate embedment to develop the Min. ultimate steel tensile capacity of the bar in concrete (32MPa).

C. Concrete compressive strength.

D. Spacing effects need to be taken into account. Note Refer to table (Table A)

he

Insert Embedment Insert Ultimate Steel

Tensile Capacity

Ultimate Concrete Capacity, Nuc Mechanical Properties

(inc 8mm nailing plate) Nus 32MPa 40MPa 50MPa Min Yield

Fsy

Min Ulti-mateFsu

Min ShearVsu

CRB12TI 108 mm >61 kN 107 kN 124 kN 144 kN 56.5 kN 61.0 kN 37.8 kN

CRBA16TI 126 mm >109 kN 157 kN 182 kN 211 kN 100.6 kN 108.5 kN 67.3 kN

CRBA20TI 156 mm >170 kN 234 kN 272 kN 315 kN 157.0 kN 169.6 kN 105.2 kN

CRB25TI 199 mm >266 kN 379 kN 440 kN 510 kN 245.5 kN 265.1 kN 164.4 kN

CRB32TI 218 mm >435 kN 469 544 632 402.0 kN 434.2 kN 269.2 kN

About COEM Ribbed Bars


Starter Bars

Comparison TableCOEM CRB Starter Bars vs N-bar Starter Bars

COEM CRB starter bars are designed to provide full strength connections between precast/tilt-up concrete panels, insitu suspended floors and floor slabs. The system comprises COEM CRB Ferrules, COEM CRB Starter Bars, purpose designed Ferrule Chairs, Antenna Caps and Nailing Plates.

The COEM CRB system is suitable for a wide range of applications, delivers great flexibility, strength, user friendly and saves valuable time at a competitive price.

COEM CRB systems will outperform the traditional common hooked bar system used in cantilevered wall connections.

Bar Size GradeMPa

MetricThread

Nominal Area(mm²)

fsy(kN)

Limit state strengthø fsy (kN)

N12 500 M10 58 21.8 17.4

CRB12 500 CRB12 113.1 56.5 45.2

N16 500 M12 84.3 31.6 25.3

CRBA16 500 CRB16 201 100.5 80.4

N20 500 M16 157 58.9 47.1

CRBA20 500 CRB20 314 157.1 125.7

N24 500 M20 245 91.9 73.5

CRB25 500 CRB25 491 245.5 196.4

Ferrule Chair

CRB Starter Bar

Antenna Cap

CRB Rebar Insert

Nail Plate


Bar Type Length Min Yield CodeCRB12 540 mm 56.5 kN CRB12SB

CRBA16 660 mm 100.6 kN CRBA16SB

CRBA20 850 mm 157.0 kN CRBA20SB

CRB25 1150 mm 245.5 kN CRB25SB

CRB32 1450 mm 402.0 kN CRB32SB

Suits Char. Strength

Length (L)

Body Dia. (A)

Hex A/F(C)

Hex A/C(d)

Hex Length(e)

Thread Depth (app)

Code

CRB12 >61 kN 95 mm 22 mm 28 mm 31.1 mm 44 mm 40mm CRB12C

CRBA16 >109 kN 105 mm 30 mm 36 mm 40.9 mm 52 mm 50 mm CRBA16C

CRBA20 >170 kN 132 mm 35 mm 40 mm 45.6 mm 56 mm 63 mm CRBA20C

CRB25 >266 kN 185 mm 44 mm 50 mm 57.2 mm 68 mm 90 mm CRB25C

CRB32 >435 kN 215 mm 55 mm 60 mm 68.1 mm 80 mm 102 mm CRB32C

CRB Starter Bars

CRB Coupler


Body Dia. (A)

Length (L)

Foot Dia (B)

Thread Depth (T)

Code

CRB12 >61 kN 22 mm 100 mm 38 mm 60 mm CRB12TI

CRBA16 >109 kN 34 mm 118 mm 50 mm 60 mm CRBA16TI

CRBA20 >170 kN 34 mm 148 mm 64 mm 60 mm CRBA20TI



CRB Inserts

L

T

ØA ØB

L

ØA

C

e

d


Body Dia. (A)

Length (L)

Foot Dia (B)

Thread Depth

Cross Hole Dia Code

CRB12 >61 kN 22 mm 78 mm 39 mm 53 mm 14.5 mm CRB12RI

CRBA16 >109 kN 30 mm 96 mm 51 mm 60 mm 14.5 mm CRBA16RI

CRBA20 >170 kN 35 mm 96 mm 65 mm 60 mm 14.5 mm CRBA20RI

CRB Rebate Inserts

L

T

ØA ØBDesigned to be used in thin walled panels and panels with rebates, where standard COEM Inserts will not fit.

Must be used to with N12 cross bar to achieve safe working loads.

Note: Designed to be used with minimum 25mm rebate to achieve similar performance as Insert. Refer to part number CRB12TI, CRBA16TI and CRBA20TI


Anchorage for column startersPre-cast column elements

Threaded insert to edge of precast panel Strip foundation in unstable ground

Formwork

CRB InsertsCRB Nail

Plate

Formwork

CRB Starter Bars

CRB CouplerCRB Nail

Plate

CRB Couplers

CRB Inserts

CRB Starter Bars

Casting 1

Casting 2

Note: All RI’s must have N12 cross bar to achieve safe working loads.


‘L” mm ‘L” mm

Typical slab to insitu wall detail - Single Row

Typical slab to insitu wall detail - Double Row

Typical Applications

Typical cantilevered footing detail Common retaining wall footing

Cantilevered party wall - Footing detail

Note these are examples only all designs should be checked and approved by a qualified engineer.


General Notation

a = actual anchor spacing (mm)am = absolute minimum anchor spacing (mm)ec = critical edge distance (mm)em = absolute minimum edge distance (mm)fsy = reinforcing bar steel yield strength (MPa)Xnae = anchor spacing effect, end of a row, tensionXnai = anchor spacing effect, internal to a row, tensionXnc = concrete compressive strength effect, tensionXne = edge distance effect, tensionXva = anchor spacing effect, concrete edge shearXvc = concrete compressive strength effect, shearXvd = load direction effect, concrete edge shearXvn = multiple anchors effect, concrete edge shear

Strength Limit State Notation

Nuc = characteristic ultimate concrete tensile capacity (kN)Nur = design ultimate tensile capacity (kN)Nurc = design ultimate concrete tensile capacity (kN)Nus = characteristic ultimate steel tensile capacity (kN)Vuc = characteristic ultimate concrete edge shear capacity (kN)Vur = design ultimate shear capacity (kN)Vurc = design ultimate concrete edge shear capacity (kN)Vus = characteristic ultimate steel shear capacity (kN)Ø = capacity reduction factor

TABLE A - Shear/Tension Reduction Factors

Absolute minimum edge Distance and anchor spacing mm - em, am

CRB Inserts CRB12TI CRBA16TI CRBA20TI CRB25TI CRB32TI

em 40 mm 50 mm 60 mm 75 mm 100 mm

am 40 mm 50 mm 60 mm 75 mm 100 mm

Reduced Characteristic Ultimate Concrete tensile Capacity - φNuc, (kN) φ = 0.6, f’c = 32MPa, 8mm Nail Plate Embedment

CRB12TI CRBA16TI CRBA20TI CRB25TI CRB32TI

64.1 93.9 140.5 227.5 281.8

Concrete Compressive Strength Effect - Xnc

fc 15 20 25 32 40 50

Xvc 0.68 0.79 0.88 1.00 1.12 1.25

Insert Type

Edge Distance e (mm)

50 75 100 125 150 175 200 225 250 275 300 325

CRB12TI 0.31 0.47 0.63 0.79 0.94 1.00

CRBA16TI 0.27 0.40 0.54 0.67 0.81 0.94 1.00

CRBA20TI 0.32 0.43 0.53 0.64 0.75 0.85 0.96 1.00

CRB25TI 0.25 0.34 0.42 0.50 0.59 0.67 0.75 0.84 0.92 1.00

CRB32TI 0.32 0.40 0.48 0.56 0.64 0.72 0.80 0.88 0.96 1.00

Edge Distance Effect - Xne


Insert Type

Anchor Spacing ae(mm)

50 75 100 125 150 175 200 250 300 350 400 500 600

CRB12TI 0.58 0.62 0.66 0.70 0.74 0.78 0.82 0.90 0.98 1.00

CRBA16TI 0.57 0.60 0.64 0.67 0.71 0.74 0.78 0.84 0.91 0.98 1.00

CRBA20TI 0.56 0.58 0.61 0.64 0.67 0.69 0.72 0.78 0.83 0.89 0.94 1.00

CRB25TI 0.54 0.57 0.59 0.61 0.63 0.65 0.67 0.72 0.76 0.80 0.85 0.93 1.00

CRB32TI 0.54 0.56 0.58 0.60 0.62 0.64 0.66 0.70 0.74 0.78 0.83 0.91 0.99

Spacing Effects end of a row - Xnae

Insert Type

Anchor Spacing a (mm)

100 150 200 250 300 350 400 450 500 550 600 650

CRB12TI 0.32 0.48 0.64 0.80 0.96 1.00

CRBA16TI 0.28 0.41 0.55 0.69 0.83 0.96 1.00

CRBA20TI 0.22 0.33 0.44 0.56 0.67 0.78 0.89 1.00

CRB25TI 0.17 0.26 0.35 0.43 0.52 0.61 0.69 0.78 0.87 0.95 1.00

CRB32TI 0.16 0.24 0.33 0.41 0.49 0.57 0.65 0.73 0.81 0.89 0.98 1.00

Spacing Effects internal of a row - Xnai

Check 2Deisgn Reduced Ultimate Concrete tensile capacity, ØNurc

ØNurc = ØNuc * Xnc * Xne * (Xnae or Xnai)

Note: Spacing factors for internal Xnai and external Xnae may be both applied when > 2 rows are in tension.

Check 3Design Reduced Ultimate tensile Capacity, Nur (kN)

ØNur = min of ØNurc or ØNus

Check Interaction - N * / ØNur ≤ 1.0 if not satisfied return to STEP 1

Reduced characteristic ultimate steel tensile capacity - φNus (kN)Verify Tensile Capacity of ReidbarTM, ØNus, Ø = 0.8

CRB Øfsy ØFus

CRB12 45.2 48.8

CRBA16 80.48 86.8

CRBA20 125.6 135.68

CRB25 196.4 212.08

CRB32 321.6 347.36


Insert Type CRB Insert Edge Distance e (mm)

50 75 100 125 150 175 200 225 250 275 300 325 350

CRB12TI 4.57 8.40 12.93 18.07 23.75 29.93 36.57 43.64 51.11 58.97 67.19 75.76 84.67

CRBA16TI 5.19 9.53 14.67 20.50 26.95 33.96 41.49 49.51 57.98 66.89 76.22 85.94 96.05

CRBA20TI 10.44 16.07 22.47 29.53 37.21 45.47 54.25 63.54 73.31 83.53 94.18 105.26

CRB25TI 11.69 17.99 25.15 33.06 41.66 50.89 60.73 71.13 82.06 93.50 105.43 117.82

CRB32TI 19.74 27.59 36.27 45.71 55.84 66.64 78.04 90.04 102.59 115.68 129.28

Reduced charateristic ultimate concrete Shear Capacity at 32MPa - φVuc, (kN),φ = 0.6, f’c = 32MPa

Verify concrete shear capacity

Concrete Compressive Strength Effect - Xvc

f’c 15 20 25 32 40 50Xvc 0.68 0.79 0.88 1.00 1.12 1.25

Load Direction Effects, Concrete Edge Shear - Xvd

Angle, α 0 10 20 30 40 50 60 70 80 90 – 180Xvd 1.00 1.04 1.16 1.32 1.50 1.66 1.80 1.91 1.98 2.00

Edge Distance

e (mm)

Spacing a (mm)

100 150 200 250 300 350 400 450 500

50 0.90 1.00

75 0.77 0.90 1.00

100 0.70 0.80 0.90 1.00

125 0.66 0.74 0.82 0.90 0.98 1.00

150 0.63 0.70 0.77 0.83 0.90 0.97 1.00

175 0.61 0.67 0.73 0.79 0.84 0.90 0.96 1.00

200 0.60 0.65 0.70 0.75 0.80 0.85 0.90 0.95 1.00

225 0.59 0.63 0.68 0.72 0.77 0.81 0.86 0.90 0.94

250 0.58 0.62 0.66 0.70 0.74 0.78 0.82 0.86 0.90

275 0.57 0.61 0.65 0.68 0.72 0.75 0.79 0.83 0.86

300 0.57 0.60 0.63 0.67 0.70 0.73 0.77 0.80 0.83

325 0.56 0.59 0.62 0.65 0.68 0.72 0.75 0.78 0.81

350 0.56 0.59 0.61 0.64 0.67 0.70 0.73 0.76 0.79

Spacing Reduction Factor for Concrete Shear - Xva


Multiple Anchor Effect - Xvn

Number of Anchors - n

Anchor spacing / Edge distance, (a / e)

0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.25 2.50

2 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00

3 0.72 0.76 0.80 0.83 0.86 0.88 0.91 0.93 0.95 0.96 0.98 1.00

4 0.57 0.64 0.69 0.74 0.79 0.82 0.86 0.89 0.92 0.94 0.97 1.00

5 0.49 0.57 0.63 0.69 0.74 0.79 0.83 0.87 0.90 0.93 0.97 1.00

6 0.43 0.52 0.59 0.66 0.71 0.77 0.81 0.85 0.89 0.93 0.96 1.00

7 0.39 0.48 0.56 0.63 0.69 0.75 0.80 0.84 0.88 0.92 0.96 1.00

8 0.36 0.46 0.54 0.61 0.68 0.74 0.79 0.84 0.88 0.92 0.96 1.00

9 0.34 0.44 0.52 0.60 0.67 0.73 0.78 0.83 0.87 0.91 0.96 1.00

10 0.32 0.42 0.51 0.59 0.66 0.72 0.77 0.82 0.87 0.91 0.96 1.00

15 0.26 0.37 0.47 0.55 0.63 0.70 0.76 0.81 0.86 0.90 0.95 1.00

Design Reduced Ultimate concrete Edge Shear capacity

ØVurc = ØVuc * Xvc * Xvd * Xva * Vvn

Check 4

Reduced Characteristic ultimate steel shear capacity

Verify Unit ReidbarTM Steel Shear Capacity (kN) per insert - φVus, φ = 0.7

CRB φVus

CRB12 26.46

CRBA16 47.11

CRBA20 73.64

CRB25 115.08

CRB32 188.44

Check 5Design Reduced Ultimate Shear Capacity - ØVur (kN)

ØVur = min of ØVurc or ØVus

Check - V * / ØVur ≤ 1.0 if not satisfied return to STEP 1

Combined loading - Tension Shear InteractionN* / ØNur + V * / ØVur ≤ 1.2 if not satisfied return to STEP 1

COEM Ribbed Bar (CRB)

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