PEIKKOθ RBC – BEAM SHOES

PEIKKOθ RBC – BEAM SHOES
24.4.2002 J.Ki.
CONTENTS
1.
DESCRIPTION OF THE SYSTEM ............................................................................3
2.
DIMENSIONS AND MATERIALS.............................................................................3
3.
MANUFACTURING....................................................................................................4
3.1 MANUFACTURING METHOD ............................................................................................4
3.2 QUALITY CONTROL ........................................................................................................4
4.
CAPACITIES ...............................................................................................................4
5.
APPLICATION ............................................................................................................4
5.1 LIMITATIONS FOR APPLICATION ......................................................................................5
5.2 DESIGN PRINCIPLES ........................................................................................................5
5.2.1 The concrete cover thickness..................................................................................8
5.2.2 Beam reinforcement ...............................................................................................8
5.2.3 Fire protection.......................................................................................................8
6.
INSTALLATION .........................................................................................................9
6.1 INSTALLATION TOLERANCES ..........................................................................................9
6.2 INSTALLATION OF THE BEAM SHOES ...............................................................................9
6.3 BEAM INSTALLATION .....................................................................................................9
2
1. Description of the system
Peikko® RBC - beam shoes are fastening items which allow moment stiff extensions and
connections between prefabricated columns and beams.
The system consists:
⇒
the anchor bolt, which is casted into the precasted column
⇒
the RBC beam shoe, which is part of the beam.
All the forces on the beam are transferred with beam shoes and bolts to the bearing
structure (column).
The joint between beam base and column should be grout as soon as possible after installation. After that the connection parts and grouting will work as reinforced concrete
structure.
The type of beam shoes in the beam depends on the dimensions of the beam, forces on
the beam and grade of concrete.
2. Dimensions and materials
USE EXAMPLE
RBC 36 T
RBC 36 T
RBC 36 DL
Table 1
A
B
R
C
E
H
∅
t
TYPE
[mm]
[mm]
[mm]
[mm]
[mm]
[mm]
[mm]
[mm]
Table 2
RBC 36 DR
Dimensions (H = changeable according to concrete grade and bond conditions)
RBC 16
115
80
49
80
50
938
27
15
RBC 20
130
90
55
80
50
1091
30
20
RBC 24
150
90
76
85
50
1206
35
25
Materials
3
RBC 30
155
100
95
90
50
1673
40
35
RBC 36
195
110
120
110
60
2375
50
50
RBC 45
240
125
145
125
60
2320
60
60
RBC 52
290
150
170
135
60
2670
70
75 / 80
Part
Base plate
Casting box
Anchorage bars
Material
S355JO
S235JRG2
BSt500S
Standard
EN 10025
EN 10025
DIN 488
3. Manufacturing
3.1 Manufacturing method
Plates
Ripped bars
Welding
Flame and mechanical cutting
Mechanical cutting
MAG by hand or with a robot, class C
3.2 Quality control
The quality control involved in producing the steel parts conforms to the requirements
set by the Finnish Code of Building Regulations.
in Germany
Schweißtechnische Lehr- und
Versuchsanstalt (SLV) Hannover and
LGA Nürnberg
in Finland
Teräspeikko Oy is under the SFS-Certification for
quality control. Beam shoes have certified product
declarations confirmed by the Concrete Association
of Finland.
4. Capacities
The capacities of the joints are related to the bolt used. National capacities for different
beam cross sections, concrete grades and beam shoes can be calculated with a PeikCol dimensioning program. You can download a PeikCol dimensioning program from
www.peikko.com for free.
Table 3
Design capacities acc. to German Code
Beam shoe
Anchor bolt
RBC 16
RBC 20
RBC 24
RBC 30
RBC 36
RBC 45
RBC 52
HPM 16
HPM 20
HPM 24
HPM 30
PPM 36
PPM 45
PPM 52
Tensile capacities
NR,s,d [kN]
61,7
96,3
138,7
220,4
432,0
690,8
929,7
5. Application
4
Allowable load
Nzul [kN]
41,1
64,2
92,5
146,9
288,0
460,5
619,8
The PEIKKO® RBC beam shoes enable the development of rigid connections of frames
through easy bolted connections between the precasted beam and column even during
erection time. Rigid frame systems with precasted concrete units can be manufactured
easy and economical with this system. Normally the beams do not need any extra supports because the rigid connection works after the tightening of nuts.
The design of beams depends on the chosen slab-system also:
⇒
using half precasted concrete slabs (composite slabs f. e. Filigran) the beams
are only bolted to the lower beam shoes, the upper connection is done with
couplers or muffs and threaded ribbed bars.
⇒
Another possibility is to use also the upper beam shoes and couplers or muffs
The beam shoes differ between RBC(-D) with left (-L) and right (-R) and RBC(-T) shoes.
Due to the geometric dimensions of the beams and columns a common plate for the left
and right type might be required.
5.1 Limitations for application
The capacities of the beam shoe have been calculated for statistic loads. In the case of
dynamic and fatigue loads, greater safety factors have to be used individually for each
case. If the application conditions are below –20 °C, it is necessary to consider using
plates with better cold impact resistance.
5.2 Design principles
Compressive forces as well as tensile forces can be transferred by the beam shoes.
Transfer and anchoring of loads in the precast column are done with PEIKKO-anchor
bolts, referering to the current standards, f.e. EC2.
The shear forces should be taken by a corbel or a shear joint to the column. If shear
forces have to be taken by the PEIKKO-system, the shear capacity of the anchor bolt
and the concrete, as well as the bending capacity have to be considered. The joint between column and beam should be grout (non-shrinking grout, for example BETEC 140)
as soon as possible after erection. After that the connection parts and grouting will work
as reinforced concrete structure.
5
Details examples:
6
7
5.2.1 The concrete cover thickness
The concrete cover of the beam shoe-connection-reinforcement is c=30mm, if the beam
shoe is placed right in the corner of the beam. A thicker concrete cover can be reached by
moving the shoe inside the cross section. The size of the casting boxes can be increased
by using extra filling material.
5.2.2 Beam reinforcement
The space required by casting boxes have to be noticed, when designing the reinforcement of the beam.
The end of the beam above the casting boxes is reinforced as shown in drawing and table below. EC 2 also requires separate stirrups for the extension area of the main bars.
Drawing / beam reinforcement
beam shoe
RBC 16
RBC 20
RBC 24
RBC 30
RBC 36
RBC 45
RBC 52
stirrup
stirrups
6Ø6
8Ø6
6 Ø 10
8 Ø 10
8 Ø 12
10 Ø 12
10 Ø 12
RBC beam shoe
lü
connection reinforcement
longitudinal reinforcement
stirrup
RBC beam shoe
transverse reinforcement,
see DIN 1045 bzw. EC2
longitudinal reinforcement
blockout of nut to be sealed afterwards
5.2.3 Fire protection
Peikko® RBC-beam shoes are approved for a fire resistance of 90 minutes (Institute for fire
protection of structures, Braunschweig, Germany).
8
6. Installation
6.1 Installation tolerances
Tolerances
±2 mm
6.2 Installation of the beam shoes
The beam shoes are placed into the reinforcement and fixed by their base plates to the
mould’s end plate with bolts.
Check lists for casting:
Check list before casting :
• The right shoe type being used
•
•
•
A check list after casting
• no changes has occurred in shoe position
beam shoes are attached in the right
position
anchor bars of the beam shoe are
banded into the main reinforcement
casting boxes are in place and filled if
necessary
•
shoe has not rotated
•
casting boxes and excess cement has
been removed
possible joint casting tubes are not filled
with concrete
•
6.3 Beam installation
When assembling the beam shoe with a bracket, the height position is guaranteed by lining plates (f.e. steel plates) put on the bracket. Afterwards the beam is layed on the anchor
bolts coming out of the column. If upper beam shoes are used, the threaded bars have to
be screwed to the sockets of anchor bolts. Subsequently the beams are screwed to the
columns with the beam shoes. The nuts have to be screwed tightly.
The tolerances and the height of the joint are shown below.
9
Table 5
Type of bolt
Joint thickness
Bolt height
from casting
surface
The tolerance
for the joint
recommendations for installations [mm]
HPM 16
50
HPM 20
50
HPM 24
50
HPM 30
50
PPM 36
55
PPM 45
65
PPM 52
70
105
115
130
150
165
195
240
±5
±5
±5
±5
±7
±7
±9
Use example : RBC 36 beam shoes and PPM 36 anchor bolts
≈
10