European technical approval
ETA-09/0295
English translation prepared by DIBt
Page 8 of 32 | 9 May
2013
Z38892.13
8.06.01-155/13
4.3.4
Overlap
joints
The required design lap length
™
0
shall be determined in accordance with EN
1992-1-1,
Section 8.7.3:
™
0
= α
1
·
α
2
·
α
3
·
α
5
·
α
6
™
b,rqd
™
0,min
with:
™
b,rqd
= according to Section 4.3.2
α
1
= 1.0 for straight bars
α
2
= 0.7…1.0 calculated acc.
to EN 1992-1-1, Table 8.2
α
3
= 1.0 because of no transverse reinforcement
α
5
= 0.7…1.0 for influence of transverse pressure acc.
to EN 1992-1-1, Table 8.2
α
6
= 1.0…1.5 for influence of percentage of lapped bars relative to the total
cross-section area acc.
to EN 1992-1-1, Table 8.3
™
0,min
= minimum lap length acc.
to EN 1992-1-1
= max {0.3·
α
6
™
b,rqd
; 15d
s
; 200 mm}
In case of diamond wet drilling multiply the values by 1.5.
The maximum permissible anchorage depth is given in Annex
18 in relation to the dispenser to
be used.
4.3.5
Embedment depth for overlap joints
Overlap joint for rebars:
For calculation of the effective embedment depth of overlap joints the concrete cover at end-face
of bonded-in rebar c
1
shall be considered (see Annex 5, Figure 10):
™
v
™
0
+ c
1
with:
™
0
= required lap length acc.
to Section 4.3.4 and to EN 1992-1-1
c
1
= concrete cover at end-face of bonded-in rebar (see also Annex 5)
If the clear distance between the overlapping rebars is greater than 4 d
s
the lap length shall be
enlarged by the difference between the clear distance and 4 d
s
.
Overlap joint for Hilti tension anchor HZA-R:
The effective embedment depth is the same like the lap length
™
v
=
™
0
(see Annex 7, Figure 12).
The total embedment depth
™
e.ges
shall be determined as follows (see Annex 7, Figure 12):
™
e.ges
³
™
0
+
™
e
with:
™
0
= required lap length acc.
to Section 4.3.4 and to EN 1992-1-1
™
e
= length of the smooth shaft (see also Annex 7),
™
e
> c
1
If the clear distance between overlapping rods exceeds 4
d
s
, the overlap length shall be
increased by the difference between the actual clear distance and 4 d
s
.
4.3.6
Concrete
cover
The concrete cover required for bonded-in rebars and Hilti tension anchor HZA-R is shown in
Annex 8, Table 3, in relation to the drilling method and the hole tolerance.
Furthermore the minimum concrete cover given in EN
1992-1-1, Section 4.4.1.2 shall be
observed.
4.3.7
Transverse
reinforcement
The requirements of transverse reinforcement in the area of the post-installed rebar connection
or of the Hilti tension anchor HZA-R connection shall comply with EN 1992-1-1, Section 8.7.4.
