Bonded Anchors

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TENN/ B+BTEC VDPGlass Capsule Anchors

Due to their outstanding strength and versatility B+BTEC VDP Capsule Anchors are increasingly replacing mechanical expansion anchors in both new construction and existing structure renovation.

Mechanical expansion anchors by design exert a radial force against the base material, creating expansion stresses that tend to split the concrete. VDP Capsule Anchors are non-expanding, so they do not set up expansion stresses in the base material. This makes them ideal for close bolt spacing or installing near concrete edges.

VDP Capsule Anchors are capable of withstanding extremely high loads. They don’t vibrate loose nor back out of the hole under torque.

On the other hand, expansion anchors slip under torque or axial loading; are unsuitable for vibratory loading; and ultimately are more expensive to use.

DESCRIPTIONB+BTEC VDP is a thin-walled glass capsule fi lled with liquid resin and quartz stone aggregate. Inside the capsule is a smaller glass capsule containing the resin hardener.

A VDP anchorage is made by placing one or more VDP capsules in a hole drilled in concrete and then spinning the threaded rod bolt into the capsule. The rotary motion shatters the capsule and mixes the contents. Chemical interaction between the resin, aggregate, glass fragments, and resin hardener, produces a high strength adhesive that cures quickly to solidly bond the bolt to the surrounding concrete mass. The anchorage produced is suitable for all types of loading – static, vibratory and shock.

ADVANTAGES• Pre-measured components guarantee correct mix composition.• Bolt centers itself in the VDP adhesive for full circumferential

bonding.• Predictable and repeatable performance.• No loss of bond-strength over time (time-tested over 30 years).• Completely sealed anchor hole.• Economical method of anchoring stainless steel bolts.• Fire-safe anchorage possible with deeper embedments.• May be installed in dry or fl ooded holes, and even underwater.• Resistant to sea and rain water, oils and greases, most acids and

alkalis. Cured VDP adhesive is non-toxic.• Long shelf life – 2 years from date of manufacture in original

packaging.

INSTALLATION PROCEDURE

a. Drill hole to required diameter and depth.b. Blow out dust with oil-free compressed air.c. Brush sides of hole to loosen dust.d. Insert bolt to check for fi t and depth.e. Repeat brushing procedure.

f. Blow out residual dust.g. Insert VDP capsule.h. Spin bolt to bottom of hole using a power drill.i. Allow time for VDP adhesive to harden. Do not

touch the bolt during hardening time.

j. Fasten attachment.

INSTALLATION ADVISORY

• When working in oil contaminated areas, usea solvent to clean the hole.

ba c d e f g h i j

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APPLICATIONS

Steelwork – anchoring columns, beams and roof trusses.

Port and harbour installations – anchoring loading dock bumpers, bollards, cranes, rails.

High-rise construction – anchoring braces for scaffolding platforms, handrails, hoists and tower cranes; stonework facades.

Water supply and waste treatment projects – stainless steel anchoring.

Oil refi nery installations

In-plant installations – machine bases, conveyors, robots, racks.

Highways, dams, bridges, tunnels – installing lighting poles, railings, highway guardrails, fl oodlighting, wall furring and ventilators in tunnels.

Railway work – rail to concrete sleepers, signaling equipment, electrifi cation masts, fencing, signages, etc.

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CAPSULE DATA

BoltMaterial

BoltSize

StressedCross-section

Tensile Strength

Yield Stress

Tension Loads Shear Loads Bending Moments

d As mm2 fuk N/mm2 fyk N/mm2 NRk,s kN γMs,N α VRk,s kN γMs,V Wel mm3 MRk,s Nm γMs,M

5.88.8

A2-70 / A4-70

M8M8M8

36.636.636.6

500800700

400640450

182926

1.501.501.87

0.50.50.5

91513

1.251.251.56

31.231.231.2

193026

1.251.251.56

5.88.8

A2-70 / A4-70

M10M10M10

585858

500800700

400640450

294641

1.501.501.87

0.50.50.5

152320

1.251.251.56

62.362.362.3

376052

1.251.251.56

5.88.8

A2-70 / A4-70

M12M12M12

84.384.384.3

500800700

400640450

426759

1.501.501.87

0.50.50.5

213430

1.251.251.56

109109109

6510592

1.251.251.56

5.88.8

A2-70 / A4-70

M16M16M16

157157157

500800700

400640450

79126110

1.501.501.87

0.50.50.5

396355

1.251.251.56

277277277

166266233

1.251.251.56

5.88.8

A2-50 / A4-50

M20M20M20

245245245

500800500

400640400

123196123

1.501.501.87

0.50.50.5

619861

1.251.251.56

541541541

325519325

1.251.251.56

5.88.8

A2-50 / A4-50

M24M24M24

353353353

500800500

400640400

177282177

1.501.501.87

0.50.50.5

8814188

1.251.251.56

935935935

561898561

1.251.251.56

5.88.8

A2-50 / A4-50

M30M30M30

561561561

500800500

400640400

280448280

1.501.501.87

0.50.50.5

140224140

1.251.251.56

187418741874

112317971123

1.251.251.56

BOLT DATA

Tinst

tfixD2

ho

do

ho = hef

INSTALLATION DATA

Allow the following minimum times to elapse before loading the anchors. Hardening time depends on the temperature in the concrete.

Concrete temperature Min. hardening times

Installing in dry holesover 20 °C 10 minutes10° to 20° 20 minutes0° to 10° 1 hour–5° to 0° 5 hours

Installing in damp holes10° to 20° 40 minutes0° to 10° 2 hours

Underwater installationover 20 °C 1 hour10° to 20° 2 hours0° to 10° 5 hours

12

6

910

11

3

12

457

8

Bolt Dimensions d x l mm

VDPCapsule

Drill HoleDiameterdo mm

Drill HoleDepthho mm

Maximum Fixture Thicknesst fi x mm

MaximumTighteningTorqueTinst Nm

Clearance HoleDiameterD2 mm

M8 x 110M10 x 130M12 x 160M16 x 190M20 x 260M24 x 300M30 x 380

VDP M8VDP M10VDP M12VDP M16VDP M20VDP M24VDP M30

10121418252835

8090110125170210280

15202540505050

10204080120180300

12141620252835

Dp

Lp

VDPCapsule

CapsuleDiameterDp mm

CapsuleLengthLp mm

Capsule Volume#

Vp cm3

Required Volume of Adhesiveper cm Embedment Depth Bolt size d Vs cm3/cm

VDP M8VDP M10VDP M12VDP M16VDP M20VDP M24VDP M30

9111317222433

80809595175210265

45.5915.85376191

M8M10M12M16M20M24M30

0.440.590.751.092.642.874.37

#Volume of adhesive obtainable from one capsule.

Liquidresin

Quartz stone aggregate

Resinhardener

Glasscapsule

Bolt materials• 5.8 = Carbon steel• 8.8 = Carbon steel• A2 = Stainless steel (AISI 304)• A4 = Stainless steel (AISI 316)

M = materialN/mm2 = newtons per square millimetrekN = kilonewton (1 kN = 100 kg)Nm = newton metre (1 mm = 0.73 lb. ft.)

A = area d = bolt size/thread diameterf = strengthk = characteristic value, k = 5% fractile

u = ultimate valuey = yieldWel = elastic section modulusM = momentN = tension force

V = shear forceR = resistances = steelγMs = partial safety factorα = reduction factor

P7-4© 2011 TENN HOLDINGS SDN. BHD. (341107-M) 120103

TABLE 2. LOAD REDUCTION FACTORS (RFs) FOR REDUCED CENTRE-TO-CENTRE SPACING

Bolt Size

d

CriticalSpacingscr mm

Minimum Spacingsmin mm

Actual Centre-to-Centre Spacings mm

M8 160 45 45 80 100 120 140 160M10 180 50 50 90 110 135 160 180M12 220 60 60 110 135 165 190 220M16 250 70 70 125 155 190 220 250M20 340 95 95 170 210 260 300 340M24 420 115 115 220 260 320 370 420M30 560 150 150 275 350 420 490 560

Reduction Factors for reduced spacing RFs 0.63 0.75 0.81 0.88 0.95 1.00

TABLE 3. LOAD REDUCTION FACTORS (RFc) FOR REDUCED EDGE DISTANCE

Bolt Size

d

Critical EdgeDistanceccr mm

Min. Edge Distancecmin mm

Actual Centre-to-Edge Distancec mm

M8 80 55 55 60 70 75 80M10 90 60 60 65 75 85 90M12 110 75 75 85 90 100 110M16 125 85 85 95 105 115 125M20 170 110 110 125 140 155 170M24 210 140 140 160 175 185 210M30 280 185 185 210 235 255 280

Reduction Factors for reduced edge distance RFc 0.75 0.81 0.88 0.95 1.00

l = lengthTinst = maximum setting torque for

prestressing of anchorNRk,p = characteristic pull-out tension

resistance value of anchor (bond failure)

NRk,c = characteristic tension resistance value of concrete (cone failure)

NRk,s = characteristic tension resistance value of steel (steel failure)

NRd = design value of resistance in tension of a single anchor

VRd = design value of resistance in shear of a single anchor

d = design value

c = concrete

p = pull-out s = centre-to-centre spacing of

anchorss1 = spacing of anchors in an anchor

group in direction 1s2 = spacing of anchors in an anchor

group in direction 2scr = centre-to-centre spacing required

to develop the characteristic resistance of an anchor

smin = minimum allowable spacing

c1 = edge distance in direction 1c2 = edge distance in direction 2ccr = edge distance required to develop

the characteristic resistance of an anchor

cmin = minimum allowable edge distanceh = thickness of concrete memberhmin = minimum thickness of concrete

member required to prevent splitting failure

hef = effective anchorage depthT = torque moment Nrec = manufacturer’s recommended

tension load

Vrec = manufacturer’s recommend-ed shear load

EOTA = European Organisation for Technical Approvals

AISI = American Iron and Steel Institute

anchor = fastening system composed of steel bolt and adhesive compound

anchorage = result obtained by the use of the anchor: or assembly system consisting of fi xture, anchor and base material

NOTATION AND TERMINOLOGY

*Adhesive & Concrete Resistance at 50 °C Long term and 80 °C Short term.

BoltMaterial

Bolt Dimensions

d x l mm

Effective Embedment

Depthhef mm

CharacteristicSpacingscr mm

Characteristic Edge

Distanceccr mm

Characteristic Resistance

Design Resistance

TensionNRk,p kN

TensionNRk,c kN

TensionNRk,s kN

ShearVRk,s kN

TensionNRd kN

ShearVRd kN

5.88.8

A2-70 / A4-70

M8 x 110M8 x 110M8 x 110

808080

160160160

808080

202020

363636

181926

91513

999

7118

5.88.8

A2-70 / A4-70

M10 x 130M10 x 130M10 x 130

909090

180180180

909090

303030

434343

294641

152320

151515

111812

5.88.8

A2-70 / A4-70

M12 x 160M12 x 160M12 x 160

110110110

220220220

110110110

404040

585858

426759

213430

212121

162618

5.88.8

A2-70 / A4-70

M16 x 190M16 x 190M16 x 190

125125125

250250250

125125125

505050

717171

79126110

396355

262626

305035

5.88.8

A2-50 / A4-50

M20 x 260M20 x 260M20 x 260

170170170

340340340

170170170

757575

112112112

123196123

619861

404040

497849

5.88.8

A2-50 / A4-50

M24 x 300M24 x 300M24 x 300

210210210

420420420

210210210

909090

154154154

177282177

8814188

505050

7011270

5.88.8

A2-50 / A4-50

M30 x 360M30 x 360M30 x 360

280280280

560560560

280280280

120120120

185185185

280448280

140224140

828282

112179112

TABLE 1. VDP CAPSULE ANCHORS: CHARACTERISTIC VALUES* according to EOTA DESIGN METHOD A Concrete ≥ C20/25

DESIGN DATA

RECOMMENDEDLOAD

TensionNrec kN

ShearVrec kN

777

586

111111

8139

151515

121913

191919

223625

292929

355635

363636

508050

595959

8012880

LOAD REDUCTION FACTORS

scr ccr

hhef

hmin = 1.33*hef

• Characteristic Spacing scr and Edge Distance ccrThe least centre-to-centre and centre-to-edge distances at which the loads listed in Table 1 are applicable. If the spacings and edge distances are less than scr/ccr, the

recommended loads must be adjusted downwards by applying reduction factors. See Tables 2 & 3.

• Minimum Spacing smin and Minimum Edge Distance cminThe absolute minimum anchor centre-to-centre and centre-to-edge distances allowed.

• Group Effect In this drawing, Anchor 4 is the most unfavourably placed anchor in the group because of its proximity to two edges and two other anchors. It attracts

two spacing and two edge reduction factors if the characteristic spacing and characteristic edge distance criteria are not met.

Example: Calculation for Reduced Tensile Load Capacity (RLC)

RLC = Nrec x RFs1 x RFs2 x RFc1 x RFc2 = …kN

Group Capacity. The capacity of a group of anchors shall be the capacity of the most unfavourably placed anchor in the group multiplied by the number of anchors in the group.c1

c2

s1

s21

2

34