ELEPHANT'S FEET FERRULES Specifiers Anchoring Resource Book Book 4.1 of 4
CAST IN ANCHORING
Cast In Anchoring
Welcome to the Ramset Anchoring Resource Book These concise and systematically presented books contain the information useful to Architects, Specifiers and Engineers when selecting the masonry anchoring solution that best suits their project. Selection of a masonry anchoring product is made on the basis of the basic type of fixing (male or female, bolt or stud), macro environment, (eg coastal or inland), micro environment (particular chemicals) and of course the capacity that best meets the design load case. Where the fixing is simple and does not warrant strength limit state calculations, selection on the basis of load case is made simple and easy with safe working load tables for each masonry anchor. Where more rigorous design and strength limit state a calculation is required, the simplified step-by-step method presented in the “Anchoring Technology” booklet will allow rapid selection and verification of the appropriate masonry anchor. This “Cast In Anchoring” booklet contains information relating to Ramset Cast In Anchor range. We know that you will find these books both useful and informative.
Part No. JD452 / Issue B / Published 03/2005
Cast In Anchoring 1
Legend of symbols
Performance related symbols Has good resistance to cyclic, and pulse loading. Resists loosening under vibration.
Installation related symbols Suitable for floor applications.
Suitable for wall applications. Anchor has a fully functioning pull-down feature, or is a stud anchor. It has the ability to clamp the fixture to the base material and provide high resistance to cyclic loading.
Suitable for overhead applications.
Suitable for use in seismic design. Suitable for hollow brick/block and hollow core concrete applications. Suitable for elevated temperate applications. Structural anchor components made from steel. Any plastic or non-ferrous parts make no contribution to holding power under elevated temperatures. May be used close to edges (or another anchor) without risk of splitting the concrete.
Material specification symbols
Anchor is cast into substrate by either puddling, attaching to reinforcing or formwork.
Anchor can be through fixed into substrate using fixture as template.
Suitable for use in dry holes.
Zinc plated to AS1791-1986 Minimum thickness 6 µm. Suitable for use in damp holes. Hot dipped galvanized to AS1650-1989 Minimum thickness 42 µm. Suitable for use in holes filled with water. Stainless steel, resistant to corrosive agents including chlorides and industrial pollutants. Suitable for use in drilled holes.
Suitable for use in cored holes.
Temporary or removable fixing.
2
Notation
a = actual anchor spacing
(mm)
V* = design shear action effect
(kN)
ac = critical anchor spacing
(mm)
Vu = ultimate shear capacity
(kN)
am = absolute minimum anchor spacing
(mm)
Vuc = characteristic ultimate concrete edge shear capacity (kN)
As = stress area
(mm2)
Vur = design ultimate shear capacity
(kN)
bm = minimum substrate thickness
(mm)
Vurc = design ultimate concrete edge shear capacity
(kN)
db = bolt diameter
(mm)
Vus = characteristic ultimate steel shear capacity
(kN)
df = fixture hole diameter
(mm)
Vusc = characteristic ultimate combined concrete/steel shear capacity
(kN)
dh = drilled hole diameter
(mm)
e = actual edge distance
(mm)
ec = critical edge distance
(mm)
em = absolute minimum edge distance
(mm)
f’c = concrete cylinder compressive strength
(MPa)
fu = characteristic ultimate steel tensile strength
(MPa)
fy = characteristic steel yield strength
(MPa)
h = anchor effective depth
(mm)
L = anchor length
(mm)
Le = anchor effective length
(mm)
M* = design bending action effect
(Nmm)
Xnae = anchor spacing effect, end of a row, tension Xnai = anchor spacing effect, internal to a row, tension Xnc = concrete compressive strength effect, tension Xne = edge distance effect, tension Xva = anchor spacing effect, concrete edge shear Xvc = concrete compressive strength effect, shear Xvd = load direction effect, concrete edge shear Xvn = multiple anchors effect, concrete edge shear Xvsc = concrete compressive strength effect, combined concrete/steel shear Z = section modulus
(mm3) (N/mm2)
N* = design tensile action effect
(kN)
ß = concrete cube compressive strength
Nu = ultimate tensile capacity
(kN)
Øc = capacity reduction factor, concrete tension recommended as 0.6
Nuc = characteristic ultimate concrete tensile capacity
(kN)
Nur = design ultimate concrete capacity
(kN)
Nurc = design ultimate concrete tensile capacity
(kN)
Nus = characteristic ultimate steel tensile capacity
(kN)
t = total thickness of fastened material(s)
(mm)
Øm = capacity reduction factor, steel bending recommended as 0.8 Øn = capacity reduction factor, steel tension recommended as 0.8 Øq = capacity reduction factor, concrete edge shear recommended as 0.6 Øv = capacity reduction factor, steel shear recommended as 0.8
Cast In Anchoring
Overview Whether an application calls for precast or cast in-situ components, there is a suitable Ramset Cast in Ferrule for almost every design case. Not only does Ramset offer reliable, quality product, Ramset understands the importance of ing the product with technically superior design information, such as this resource book to guide correct product selection and safe installation. Extensive research, development and testing are invested in Ramset products so that designers can be secure in the knowledge that they have access to the real performance and capabilities of the Cast In Ferrules. Care should be taken to that the performance data contained herein relates to the Ramset range of Cast In Ferrules and hence should not be used to justify a generic replacement that may appear physically similar. The Ramset Cast In ferrule range is available in Zinc, Hot Dipped Galvanised and Stainless Steel finishes to cater for a wide range of atmospheric conditions. Sizing from M10 through M24 allows for economical designs to be derived, with appropriate accessories providing a high degree of installation flexibility. The following section introduces the designer and / or engineer to the Ramset Cast In Ferrule range and provides performance information to allow selection of the right Cast In Ferrule for the job.
3
Elephant’s Feet Ferrules
General Information
Installation
Product Elephants’ Feet Ferrules are all steel threaded inserts for casting into precast and in-situ concrete elements, giving a stress free, vibration resistant fixing. They may be used with or without component reinforcement.
1. Nailing plate, or bolted to formwork. 2. “Puddled” into wet concrete
Principal Applications • • • •
Features and Benefits • Stress free anchoring allows close to edge and reduced spacing installations. • Cast In placement eliminates the need for drilling. This is particularly beneficial when reinforcement congestion makes drilling difficult. • Cast In Ferrules have high tensile load capacities and are suitable for applications in tension zones and where subject to dynamic load cases. • Ideal for shallow embedment as the component reinforcement can be tied into the structural reinforcement for improved load distribution. • The use of a cross bar in the ferrule promotes ductile behaviour if exposed to an overload event.
Small and lightweight precast fixing point. Structural connections. Curtain wall and facade fixings. Temporary precast bracing point.
Cast In Anchoring 3
Elephant’s Feet Ferrules
Installation and Working Load Limit performance details Installation details Ferrule size, db x L (mm)
*
Minimum Dimensions*
Working Load Limit
Cross hole to suit
Tightening torque, Tr (Nm)**
Edge distance, ec (mm)
Anchor spacing, ac (mm)
Substrate thickness, bm (mm)
M10 x 45
R8
17
60
120
M12 x 55
R8
30
75
M16 x 70
R10
75
M20 x 70
R10
M24 x 115
Y12 / N12
Shear, Va (kN)
Tension, Na (kN)
Concrete compressive strength, f’c
Concrete compressive strength, f’c
20 MPa
32MPa
40 MPa
20 MPa
32MPa
40 MPa
50
6.7
7.9
8.5
4.4
6.0
7.0
150
65
8.9
10.4
11.2
6.7
9.2
9.6
100
200
85
14.9
17.4
18.8
11.4
15.6
17.2
144
100
200
85
17.6
20.6
22.2
12.7
17.4
20.3
250
165
330
140
36.4
42.6
45.9
30.4
39.8
39.8
For shear loads acting towards an edge or where these minimum dimensions are not achievable, please use the simplified strength limit state design process to capacity.
** Recommended tightening torques are based on the use of grade 4.6 bolts. Note: Confirm bolt capacity independently of tabulated information.
Description and Part Numbers Ferrule size, db
Ferrule length, L (mm)
Effective depth, h (mm)
Thread length, Lt (mm)
Cross hole to suit
M10
45
41
20
M12
55
51
M16
70
M20 M24
Part No. Zn
Gal
R8
FE10045
�-
25
R8
FE12055
FE12055GH
66
32
R10
FE16070
FE16070GH
70
66
35
R10
FE20070
FE20070GH
115
111
50
Y12
-�
FE24115GH
Effective depth, h (mm) Read value from “Description and Part Numbers” table.
Engineering Properties Carbon Steel
Ferrule size, db
Stress area threaded section, As (mm2)
Yield strength, fy (MPa)
UTS, fu (MPa)
M10
71.2
240
360
190.0
M12
88.3
240
360
334.5
M16
158.0
240
360
692.8
M20
242.0
240
360
1034.0
M24
365.0
240
360
2066.0
Section modulus, Z (mm3)
3
Elephant’s Feet Ferrules / Strength Limit State Design
Step 1 - Select anchor to be evaluated
Table 1a Indicative combined loading – interaction diagram
Notes: • Shear limited by Ferrule capacity. • Tension limited by the lesser of steel capacity and concrete cone capacity. • No edge or spacing effects. • f’c = 20 MPa
Table 1b Absolute minimum edge distance and anchor spacing values, em and am (mm) Ferrule size, db
M10
M12
M16
M20
M24
em, am
30
36
48
60
72
Step 1c Calculate anchor effective depth, h (mm) Effective depth, h (mm) Read value from “Description and Part Numbers” table on page 6. Checkpoint 1 Anchor size determined, absolute minima compliance achieved, effective depth (h) calculated.
Cast In Anchoring 3
Elephant’s Feet Ferrules / Strength Limit State Design
Step 2 - concrete tensile capacity – per anchor
Table 2a Reduced characteristic ultimate concrete tensile capacity, ØNuc (kN), Øc = 0.6, f’c = 20 MPa Ferrule size, db
M10
Ferrule length, L (mm)
Effective depth, h (mm)
45
41
55
51
70
66
115
111
M12
M16
M20
20.5
22.9
M24
7.9 12.1 54.7
Table 2b Concrete compressive strength effect, tension, Xnc f’c (MPa)
15
20
25
>32
Xnc
0.87
1.00
1.12
1.26
Table 2c Edge distance effect, tension Xne Edge distance, e (mm)
30
40
50
60
70
85
100
Ferrule length, L (mm)
Effective depth, h (mm)
45
41
0.65
0.76
0.87
0.98
1
55
51
0
0.67
0.76
0.85
0.94
1
70
66
0
0
0.65
0.72
0.79
0.90
1
115
111
0
0
0
0
0
0.66
0.72
120
140
170
0.80
0.89
1
Table 2d Anchor spacing effect, end of a row, tension, Xnae Anchor spacing, a (mm)
30
40
50
60
70
85
100
125
150
200
Ferrule length, L (mm)
Effective depth, h (mm)
45
41
0.63
0.66
0.70
0.74
0.78
0.85
0.91
1
55
51
0
0.63
0.66
0.70
0.73
0.78
0.83
0.91
0.99
1
70
66
0
0
0.63
0.65
0.68
0.71
0.75
0.82
0.88
1
115
111
0
0
0
0
0
0.63
0.65
0.69
0.73
0.80
250
300
350
0.88
0.95
1
3
Elephant’s Feet Ferrules / Strength Limit State Design
Table 2e Anchor spacing effect, internal to a row, tension, Xnai Anchor spacing, a (mm)
30
40
50
60
70
85
100
125
150
200
Ferrule length, L (mm)
Effective depth, h (mm)
45
41
0.25
0.33
0.41
0.49
0.57
0.69
0.81
1
55
51
0
0.26
0.33
0.39
0.46
0.56
0.65
0.82
0.98
1
70
66
0
0
0.25
0.30
0.35
0.43
0.51
0.63
0.76
1
115
111
0
0
0
0
0
0.26
0.30
0.38
0.45
0.60
250
300
350
0.75
0.90
1
Checkpoint 2 Design reduced ultimate concrete tensile capacity, ØNurc ØNurc = ØNuc * Xnc * Xne * (Xnae or Xnai)
Step 3 - anchor tensile capacity – per anchor
Table 3a Reduced characteristic ultimate steel tensile capacity, ØNus (kN), Øn = 0.8 Ferrule size, db
M10
M12
M16
M20
M24
ØNus
17.1
21.2
37.9
58.1
87.6
Step 3b Reduced characteristic ultimate bolt steel tensile capacity, ØNtf (kN) Establish the reduced characteristic ultimate bolt steel tensile capacity, ØNtf from literature supplied by the specified bolt manufacturer. For nominal expected capacities of bolts manufactured to ISO standards, refer to section 5. Checkpoint 3 Design reduced ultimate tensile capacity, ØNur ØNur = minimum of ØNurc, ØNus , ØNtf Check N* / ØNur 1, if not satisfied return to step 1
Cast In Anchoring 3
Elephant’s Feet Ferrules / Strength Limit State Design
Step 4 - concrete shear capacity – per anchor Table 4a Reduced characteristic ultimate concrete edge shear capacity, ØVuc (kN), Øq = 0.6, f’c = 20 MPa Ferrule size, db
M10
M12
M16
M20
M24
Edge distance, e (mm) 30
2.7
35
3.4
3.5
40
4.2
4.3
50
5.9
6.0
6.9
60
7.7
7.9
9.03
9.8
70
9.7
10.0
11.4
12.4
13.7
100
16.6
17.1
19.4
21.1
23.4
200
46.9
48.3
54.9
59.7
66.3
88.7
100.9
109.7
121.7
155.4
168.9
187.4
236.1
261.9
300 400 500 600
344.3
Table 4b Concrete compressive strength effect, concrete edge shear, Xvc f’c (MPa)
15
20
25
>32
XVC
0.87
1.00
1.12
1.26
Table 4c Load direction effect, concrete edge shear, Xvd Angle, αº
0
10
20
30
40
50
60
70
80
90-180
XVd
1.00
1.04
1.16
1.32
1.50
1.66
1.80
1.91
1.98
2.00
Table 4d Anchor spacing effect concrete edge shear, Xva Edge distance, e (mm)
30
35
40
50
60
70
100
200
300
400
500
600
30
0.70
0.67
0.65
0.62
0.60
0.59
0.56
0.53
35
0.73
0.70
0.68
0.64
0.62
0.60
0.57
0.54
0.52
40
0.77
0.73
0.70
0.66
0.63
0.61
0.58
0.54
0.53
50
0.83
0.79
0.75
0.70
0.67
0.64
0.60
0.55
0.53
0.53
60
0.90
0.84
0.80
0.74
0.70
0.67
0.62
0.56
0.54
0.53
0.52
75
1.00
0.93
0.88
0.80
0.75
0.71
0.65
0.58
0.55
0.54
0.53
0.53
1.00
1.00
0.90
0.83
0.79
0.70
0.60
0.57
0.55
0.54
0.53
1.00
0.92
0.86
0.75
0.63
0.58
0.56
0.55
0.54
1.00
0.93
0.80
0.65
0.60
0.58
0.56
0.55
1.00
0.90
0.70
0.63
0.60
0.58
0.57
300
1.00
0.80
0.70
0.65
0.62
0.60
450
1.00
0.95
0.80
0.73
0.68
0.65
1.00
0.90
0.80
0.74
0.70
1.00
0.88
0.80
0.75
1.00
0.90
0.83
1.00
0.92
Anchor spacing, a (mm)
100 125 150 200
600 750 1000 1250 1500 Note: For single anchor designs, Xva = 1.0
1.00
3
Elephant’s Feet Ferrules / Strength Limit State Design
Table 4e Multiple anchors effect, concrete edge shear, Xvn 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
20
0.23
0.35
0.45
0.54
0.61
0.68
0.75
0.80
0.85
0.90
0.95
1.00
Number of anchors, n
Note: For single anchor designs, Xvn = 1.0
Checkpoint 4 Design reduced ultimate concrete edge shear capacity, ØVurc ØVurc = ØVuc * Xvc * Xvd* Xva * Xvn
Step 5 - anchor shear capacity – per anchor
Table 5a Reduced characteristic ultimate steel shear capacity, ØVus (kN), Øv = 0.6 (i) ØVusc Reduced characteristic ultimate combined concrete / steel shear capacity Ferrule size, db
M10
Ferrule length, L (mm)
Effective depth, h (mm)
45
41
55
51
70
66
115
111
M12
M16
M20
26.8
31.7
M24
12.1 16
65.7
(ii) Xvsc Concrete compressive strength effect, combined concrete / steel shear f’c (MPa)
15
20
25
32
Xvsc
0.91
1.00
1.08
1.17
ØVus = ØVusc * Xvsc
Cast In Anchoring 3
Elephant’s Feet Ferrules / Strength Limit State Design
Step 5b - Reduced characteristic ultimate bolt steel shear capacity, ØVsf (kN) Establish the reduced characteristic ultimate bolt steel shear capacity, ØVsf from literature supplied by the specified bolt manufacturer. For nominal expected capacities of bolts manufactured to ISO standards, refer to section 5. Checkpoint 5 Design reduced ultimate concrete shear capacity, ØVur ØVur = minimum of ØVurc, ØVus, ØVsf Check V* / ØVur 1, if not satisfied return to step 1
Step 6 - Combined loading and specification Checkpoint 6 Check N*/ØNur + V*/ØVur, 1.2, if not satisfied return to step 1 Specify Ramset Elephants’ Feet Ferrule, {Ferrule Size} {{Part Number}}. With a (Bolt Grade) bolt. Example Ramset Elephants’ Feet Ferrule, M16 x 95 (FE16070), with a Gr. 4.6 bolt.
5
Typical Bolt Performance Information
Tabulated below are nominal reduced ultimate characteristic capacities for bolts manufactured in accordance with ISO 898-1. The expected capacity of bolts should be indendpently checked by the designer based on the bolt manufacturers published performance information.
Tension Reduced nominal bolt tensile capacity, ØNtf (kN), Øn = 0.8 Bolt type
M6
M8
M10
M12
M16
M20
M24
Grade 4.6 Carbon Steel
6.4
11.7
18.6
27.0
50.2
78.4
113.0
Grade 8.8 Carbon Steel
13.3
24.3
38.5
56.0
104.2
162.7
234.4
Stainless Steel A4-70 (AISI 316)
11.3
20.5
32.5
47.2
87.9
137.2
-
Shear Reduced nominal bolt shear capacity, ØVsf (kN), Ør = 0.8 Bolt type
M6
M8
M10
M12
M16
M20
M24
Grade 4.6 Carbon Steel
3.3
6.1
9.8
14.4
27.4
43.0
62.0
Grade 8.8 Carbon Steel
6.6
12.4
20.0
29.3
56.1
88.3
127.2
Stainless Steel A4-70 (AISI 316)
5.6
10.5
16.8
24.7
47.4
74.5
-
Anchoring Resource Book Design Worksheet Project Design Location Project ID Date Design By Checked
Sketch
Notes
Step 1 - Select anchor to be evaluated
N* & V* are the per anchor load cases. Check both external and internal anchors for suitability.
Table 1a Interaction Diagram Anchor Type
Tensile design action effect
*N
kN
Shear design action effect
V*
kN
Find intersection of N* and V* Values. Select anchor size.
t
mm
Table 1b Absolute minima, am & em Check for compliance with absolute minima
f’c
MPa
Step 1c Calculate effective depth, h
Anchor spacing
a
mm
Checkpoint 1
Edge distance
e
mm
No. of anchors in a row parallel to edge
n
Anchor size selected? Comply with absolute minima? Effective depth, h calculated?
Fixture thickness Concrete compressive strength
Direction of shear load
degs.
Notes for this application
tick
tick tick tick
Step 2 - concrete tensile capacity – per anchor
Step 4 - concrete shear capacity – per anchor
Table 2a Concrete tensile capacity, ØNuc
Table 4a Concrete shear capacity, ØVuc
Table 2b Concrete compressive strength effect, Xnc
x
Table 4b Concrete compressive strength effect, Xvc
x
Table 2c Edge distance effect, Xne
x
Table 4c Load direction effect, Xvd
x
Table 2d Anchor spacing effect, external to a row Xnae or
x
Table 4d Anchor spacing effect, Xva
x
Table 4e Multiple anchors effect, Xvn
x
or
Table 2e Anchor spacing effect, internal to a row Xnai
x
Checkpoint 2
Checkpoint 4
Calculate ØNurc = ØNuc * Xnc* Xne* (Xnae or Xnai)
=
Calculate ØVurc = ØVuc * Xvc * Xvd * Xva * Xvn
Step 3 - anchor tensile capacity – per anchor
=
Step 5 - anchor shear capacity – per anchor
Table 3a Calculate steel tensile capacity, ØNus
x or
Table 5a Calculate steel shear capacity, ØVus
x
Step 3b Confirm bolt tensile capacity, ØNtf
x or
Step 5b Confirm bolt shear capacity, ØVsf
x
Checkpoint 3
Checkpoint 5
ØNur = Minimum of ØNurc’ ØNus’ ØNtf N* / ØNur 1.0?
/
= =
ØVur = Minimum of ØVurc’ ØVus’ ØVsf tick
If not satisfied return to step 1.
V* / ØVur 1.0?
/
=
tick
If not satisfied return to step 1. Tensile Design Completed
Shear Design Completed STEP 6 Combined loading and specification Checkpoint 6 N* / ØNur + V* / ØVur 1.2? /
+
/
=
tick
If not satisfied return to step 1 Design Check Completed Specify
Auckland - North Shore 23-29 Poland Rd Glenfield p 09 444 2354 f 09 444 5226 e
[email protected]
Tauranga - Mt Maunganui Unit 1, 15 Portside Drive p 07 572 0520 f 07 572 0530 e
[email protected]
Wellington 147 Taranaki St p 04 384 4138 f 04 385 0868 e
[email protected]
Auckland - Penrose 35 Station Rd, p 09 579 3072 f 09 579 1701 e
[email protected]
Rotorua Waterford Park Estate 50 Old Taupo Rd p 07 348 0190 f 07 348 9200 e
[email protected]
Nelson 2 Parere St p 03 548 2664 f 03 548 3559 e
[email protected]
Auckland - Henderson 123 Central Park Drive p 09 838 9865 f 09 837 3014 e
[email protected]
New Plymouth 19 Eliot St p 06 759 8984 f 06 759 8983 e
[email protected]
Auckland - East Tamaki Unit 1, 333 East Tamaki Road p 09 272 4701 f 09 272 4703 e
[email protected]
Palmerston North 601 Tremaine Avenue p 06 357 6745 f 06 357 6775 e
[email protected]
Dunedin 5 Melbourne St P.O. Box 2227 p 03 455 1134 f 03 456 1388 e
[email protected]
Whangarei 15 Reyburn St p 09 438 2010 f 09 438 9188 e
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Napier - Onekawa 124 Taradale Road p 06 843 0067 f 06 843 0043 e
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