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Bonded Anchors
P7-1
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
P7-2
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.
P7-3
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