WB - Rothoblaas

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WB - Rothoblaas
WB technical data sheets
rev00.11/2011
Tensile
reinforcement general rules
Tensile
reinforcement
for glued laminated
timber
Timber-timber
connection general rules
Reinforcement of
notched beams
Lateral tensile
reinforcement
General brochure
WB fastening system by SFS intec
:
DIN 1052
2004-08
Reinforcement of notched beams
WB
Data sheet
No. 04
Convincing advantages:
high load-bearing capacity
easy installation
invisible reinforcement
labour saving no gluing
required
easy design
Proposal of design
according to DIN 1052: 2004-08
Service class 1, load-duration class short-term;
The reinforcements must be calculated for the following tensile force Ft,90,d
Ft,90,d = 1.3 · Vd · [ 3 · (1 – α )² – 2 · (1 – α )³ ]
he
mit α =
h
he
Vd design value of transverse force
lad,2
n · Rax,d
h
lad,1
The distance from the fastener
to the bottom edge of the beam
must be as small as possible,
so that no further lateral tensile
proof is necessary.
≤1
kmod = 0.9; GL24h; he = 800 mm
800
n
number of fasteners (only one fastener is permitted in the longitudinal direction of the beam)
Rax,d design value of the load-bearing capacity of a fastener
Values Rax,d can be found in the table below
lef = min [ lad,1 ; lad,2 ]
60
60
60
WB -T- 20
48 mm
60 mm
a1,c
40 mm
50 mm
a2,c
40 mm
50 mm
lef = 500 mm => Rax,d = 70.0 kN
for WB-T-20 (from table)
a1,c
Two fasteners are required.
a2,c
a2
a2,c
Please note that in the case of notching
only one rod may be allowed in the
longitudinal direction of the beam.
128.7 kN
2 · 70.0 kN
Load-bearing capacities of the WB threaded rod
For ρk = 380 kg/m³ and kmod = 0.9
lef
100 mm
200 mm
300 mm
400 mm
500 mm
600 mm
700 mm
800 mm
eyond lef = 644 mm:
b
Rax,d,max = 72.38 kN
WB -T-20
Rax,d
14.0 kN
28.0 kN
42.0 kN
56.0 kN
70.0 kN
84.0 kN
98.0 kN
112.0 kN
beyond lef = 808 mm:
Rax,d,max = 113.10 kN
Intermediate values may be calculated by linear interpolation.
The values on a grey background in the table for Rax,d,max are the
tensile fracture forces and must not be exceeded! They are
independent of gross density, service class and the load-duration
class.
If you arrive at a higher value than Rax,d,max, you must
continue the design with Rax,d = 72.38 kN for d = 16 mm or
Rax,d = 113.1 kN for d = 20 mm!
The stress proofs (shear force and bending)
of the remaining cross-section must be
verified independently of the lateral tensile
reinforcement.
= 0.92 < 1
WB-T-d fastener range
Type
Other gross densities or modification factors: R'ax,d = Rax,d · kF · kM
WB -T-16
Rax,d
11.2 kN
22.4 kN
33.6 kN
44.8 kN
56.0 kN
67.2 kN
180
Ft,90,d = 1.3 · Vd · [ 3 · (1 – a )² – 2 · (1 – a )³ ] =
1.3 · 300 kN · [ 3 · (1 – 0.62)² – 2 · (1 – 0.62)³ ] =
128.7 kN
Minimum spacing
WB-T-16
1300
50
Arrangement
a2
h = 1300 mm; Vd = 300 kN
he
800 mm
with α =
=
= 0.62
h
1300 mm
Material
Diameter
T = carbon steel
d1 [mm]
Length
[mm]
WB
-
T
-
16
x
3000
WB
-
T
-
20
x
3000
The fasteners are cut precisely to the required length using
commercially available tools (such as angle grinders) prior to
installation.
Amendment factor kF for different gross densities
GL
ρk in kg/m³
kF
24h
28c
28h
32c
32h
36c
36h
24c
350
380
410
430
450
0.848
1.000
1.164
1.280
1.402
Amendment factor kM for different modification factors
kmod
kM
0.50
0.55
0.60
0.65
0.70
0.80
0.90
Setting tool
WB-T-16
WB-T-20
Drill set
DWA-12-ZA-Set
DWA-15-ZA-Set
1.10
0.555 0.611 0.667 0.722 0.778 0.889 1.000 1.222
Drill bit 400 mm
DWA-12-M7
DWA-15-M9
Insertion sleeve
ZE-16-WB
ZE-20 -WB
All calculations must be verified and
signed off by the engineer in charge of the
project before the work is performed.
SFS intec AG / FasteningSystems / CH-9435 Heerbrugg / [email protected] / www.sfsintec.biz
Turn ideas into reality.
© SFS intec, iTW, 10/07, 901209, E
Technical changes reserverd
Printed in Switzerland
Ft,90,d
Example :
DIN 1052
2004-08
WB fastening system by SFS intec
Lateral tensile reinforcement
WB
Data sheet
No. 05
WT fasteners
Beam hanger
Joist hanger
Convincing advantages:
high load-bearing capacity
easy installation
invisible reinforcement
Suspended
purlin
labour saving no gluing
required
easy design
Proposal of design
Connection
geometry
Calculation is performed in principle in accordance with DIN 1052: 2004-08
Structural components which are subject to stress due to forces exerted perpendicular to the
grain can be reinforced with WT fasteners. This can prevent a reduction in load-bearing capacity of
the connection. In the case of lateral tensile stress in the main purlin, the load-bearing capacity of the
connection must be reduced.
ar
hHT
hNT
a
lad,c
lad,t
lg
bHT
bNT
F90,d
a
=
hHT
No proof is necessary for transverse connections where a/hHT > 0.70.
0,70
0.70
> 0.20
0,20
0,5 · hHT
0.5
If ar > 0.5 hHT the connection must be handled as (two) separate
transverse connections.
lg > 0.5
0,5 · hHT
If lg ) 0.5 hHT the fasteners must be handled as one connection.
ar
bHT
hHT
bNT
hNT
a
ar
lg
Proof
Transverse connections where a/hHT < 0.20 may only be subject to brief exposure
to loads (e.g. wind suction forces).
width of the main purlin
height of the main purlin
width of the secondary purlin
height of the secondary purlin
distance between the (top) connection and the loaded edge
distance between the two outermost connections
clear distance between the groups of connections
For each group of fasteners it must be verified that
Ft,90,d
n · Rax,d
1.0
1,0
Ft,90,d = 1 – 3 ·
2
+2·
3
· F90,d
lad
,c
ad,c
ef = min
lef
lad ,t
n
number of fasteners (only one fastener is permitted outside the transverse joint in the
longitudinal direction of the purlin)
Ft,90,d force to be absorbed by the WB fastener
F90,d
design value of the transverse force being transmitted
lef
effective thread length
Rax,d
design value of the load-bearing capacity of a fastener
Tables with design values Rax,d and correction factors are printed on the back page.
When arranging the WB fasteners, the spacings and distances shown in the drawings must be
adhered to. The top of the WB fastener must be * 0.7 hHT from the loaded edge.
a
0,7 h
lad,t
Minimum spacings and
Mindestabstände
distances
lad,c
Arrangement
a1
a1
nomax.
more1 than
1 row of
WT
B fasteners
WB-Reihe
pro
Seite
onausserhalb
each side outside
the transverse joint
des Queranschlusses
a2,c
a2
a2,c
WB -T-16
WB-T-20
a1
64 mm
80 mm
a2
48 mm
60 mm
a1,c
40 mm
50 mm
a2,c
40 mm
50 mm
Example
Given
Connection
geometry
Service class 2, load-duration class long-term; kmod = 0.7
main purlin
secondary purlin
GL32c hHT
= 1500 mm
GL24h bNT / hNT = 200 mm / 600 mm; e = 2000 mm
connection
joist hanger
Vertical
connection force
F90,d = 55 kN
200 mm / 450 mm
produced by steel fabricator
Verification of the boundary conditions
=
a
=
h HT
400 mm
1500 mm
= 0,267
0.267
0.70 und > 0.20
0,70
0,20
ar = 200 mm + 2 · 50 mm = 300 mm
750 mm = 0.5
0,5 · h HT
lg = 2000 mm – 300 mm = 1700 mm > 750 mm = 0.5
0,5 · h HT
Design
Resultant tensile force perpendicular to the grain
Ft,90,d = 1 – 3 · 0.267
0,2672 + 2 · 0.267
0,2673 · 55 kN = 45,35
45.35 kN
Fastener selected: 1 WB-T-20, min. length 1100 mm, so that the distance between the top of
the WB fastener and the loaded edge * 0.7 · h:
0.7 · h = 0,7
0.7 · 1500 mm = 1050 mm
lmin = 0,7
lef = min
400 mm
= 400 mm
700 mm
Rax,d = 56 kN · 1,164
0,778 = 50,7
(aus Tabelle,
siehe Rückseite)
1.164 · 0.778
50.7 kN (from
table overleaf)
Proof
45.35
45,35 kN
1 · 50.7
50,7 kN
= 0.89
0,89
1.0
1,0
1500
1100
400
400
700
Arrangement
50
100 100
Remarks
55 kN
– In the case of a one-sided connection, moment of displacement My = FV · bHT / 2, through which the
main beam is subject to torsional stress, must be taken into account in the proof of the main beam.
– This also applies to two-sided connections in which the bearing forces VZ of opposing secondary
purlins differ by more than 20%.
– Detailed instructions for calculating the load-bearing capacity of the WB system are contained in
the data sheet entitled «Lateral tensile reinforcement – General principles of design»
(WB Data sheet No. 01).
– We recommend the WT system (fasteners up to 330 mm long) for smaller dimensions and refer
readers to the relevant data sheets.
– All calculations must be verified and signed off by the planner in charge of the project
before the work is performed.
WB fastening system
High performance for lateral tensile
reinforcement
Load-bearing capacities of the WB threaded rod
For lk = 380 kg /m³ and kmod = 0.9
Other gross densities or modification factors:
R'ax,d = Rax,d · kF · kM
WB -T-16
lef
WB -T-20
Rax,d
WB-T-d fastener range
100 mm
11.2 kN
14.0 kN
200 mm
22.4 kN
28.0 kN
300 mm
33.6 kN
42.0 kN
400 mm
44.8 kN
56.0 kN
500 mm
56.0 kN
70.0 kN
600 mm
67.2 kN
84.0 kN
700 mm
beyond lef = 644 mm:
Rax,d,max = 72.38 kN
98.0 kN
800 mm
Type
Rax,d
Material
Diameter
Length
T = carbon steel
d1 [mm]
[mm]
WB
-
T
-
16
x
3000
WB
-
T
-
20
x
3000
The fasteners are cut precisely to the required length using
commercially available tools (such as angle grinders) prior to
installation.
Amendment factor kF for different gross densities
112.0 kN
GL
beyond lef = 808 mm:
Rax,d,max = 113.10 kN
lk in kg/m³
kF
24c
24h
28c
28h
32c
32h
36c
36h
350
380
410
430
450
0.848
1.000
1.164
1.280
1.402
Intermediate values may be calculated by linear interpolation.
The values on a grey background in the table for Rax,d,max are
the tensile fracture forces and must not be exceeded! They
are independent of gross density, service class and the loadAmendment factor kM for different modification factors
duration class.
If you arrive at a higher value than Rax,d,max, you must
kmod
0.50 0.55 0.60 0.65 0.70 0.80 0.90 1.10
continue the design with Rax,d = 72.38 kN for d = 16 mm
0.555
0.611 0.667 0.722 0.778 0.889 1.000 1.222
k
M
or Rax,d = 113.1 kN for d = 20 mm!
Setting tools
Fastener
Tools and accessories
WB-T-16
WB-T-20
Drill set
2 Bit extensions
each 1000 mm
1 Drill bit 400 mm
DWA-12-ZA-Set
DWA-15-ZA-Set
Fastener
Tools and accessories
WB-T-16
WB-T-20
Insertion sleeve
ZE-16-WB
ZE-20-WB
More information
If you have any questions about
fastening technology, just call us.
We'll be pleased to advise you!
WB-T-16
WB-T-20
Drill bit 400 mm
DWA-12-M7
DWA-15-M9
Tool holder
UNC thread
ZA1/2"-11/4"-7UNC
Tool holder
Morse taper no. 3
ZA1/2"- MK3
SFS intec AG / FasteningSystems / CH-9435 Heerbrugg / [email protected] / www.sfsintec.biz
Rothoblaas srl
Via dell’Adige 2 /1
IT-39040 Cortaccia BZ
Tel +39 0471 81 84 00
Fax +39 0471 81 84 84
[email protected]
www.rothoblaas.com
Turn ideas into reality.
© SFS intec, iTW, 10/07, 901210, E
Technical changes reserved
Printed in Switzerland
Adapters for drivers
Simple solution for lateral tensile reinforcements:
WB fastening system for economical and secure
reinforcements for glulam timber structures
Convincing advantages:
– easy and reliable calculation
– lateral tensile reinforcement without gluing
– individually cut to length
– high tensile strength of 800 N/mm2
– time saving of up to 50%
Foto Fabry
– simple principles of calculation
facilitate reliable design
– forces are transmitted solely through
the thread indentations – time-consuming application of adhesives is
eliminated!
– the high tensile strength of 800 N/mm2
means that up to 50% fewer threaded
bars are needed
– this results in significant time savings
and makes the WB System extremely
economical compared to conventional
reinforcement methods
– the fully countersunk, invisible
threaded bars mean that subsequent
roof assembly is not obstructed
Diverse applications can be implemented with the WB System, such as:
Transverse joints
Double-pitch roof
purlins with arched
lower chord
Penetrations
Arched
purlin
Double-pitch
roof purlin
Notching
Make large lateral tensile reinforcements
faster and more economically with the
new WB fastening system!
After easy calculation, a borehole corresponding to the core diameter of the threaded bar is drilled in the purlin,
and the WB threaded bars are then inserted:
2. Holes up to 3 metres deep can be drilled using the bit extensions of the WB System.
1. Pilot drilling with column type drill.
3. Cut threaded bar to exactly the
required length using metal saw or
right-angle grinder.
4. Install the threaded bar using a drill with high torque.
5. Countersink WB directly with insertion
sleeve.
6. Release insertion sleeve with ratchet.
7. Cover hole with end-grained wooden
plug.
A strong partner in mechanical fastening with
an international presence.
Fastening technology you can rely on
As a manufacturer of fastening systems SFS intec has set
standards for many years based on its long experience of
the market and intensive research and development work.
Numerous innovations which have proved their qualities
millions of times all over the world are tangible evidence of
this fact. Manufacturing know-how accumulated over many
years in production plants in various European countries and
the USA makes SFS intec a highly qualified partner in the field
of mechanical fastening technology.
Principles of
calculation
Detailed planning
documentation
catering for a very
wide range of
applications ensures easy, reliable
calculation.
For special applications our structural
timberwork consultants will be
pleased to assist
you in selecting
the most efficient
and cost-effective
fastening method.
If you have any
questions about
fastening technology, just call us.
System components
Headless threaded rod
Insertion sleeve for countersinking
Adapter for drivers
Drilling system
Tensile strength
800 N/mm2
Diameter
16 mm
20 mm
Thread geometry
DIN 7998
Length
3000 mm
individually cut to length
easy storage
Surface finish
zinc electroplated
blue passivated, chromium(VI)-free
SFS intec AG / FasteningSystems / CH- 9435 Heerbrugg / fs.heerbrugg @ sfsintec.biz / www.sfsintec.biz
To make you more competitive.
© SFS intec, iTW, 02/07, 900951, E
Technical changes reserved
Printed in Switzerland
Assured quality
The high quality standards by SFS intec's
products and services are guaranteed by
a dynamic quality assurance system and
extensive testing in the company's own
test laboratories.

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