Changes in the Jordahl design methods ESA

JORDAHL ® ESA Methode
Engineering Solutions for Anchor Channels
JORDAHL® Expert - New version of the JORDAHL design software for JTA-CE anchor channels
Changes in the Jordahl design methods ESA
The current basis for the design of anchor channels in Europe is the CEN/TS 1992-4:2009 "Design
of fastenings for use in concrete". At present, the series of standards are being converted into an
EN-Directive. The prerequisite for the application of this design procedure is corresponding to
European Technical Approval which is already available for the JORDAHL® JTA-CE anchor channels
(ETA 09/0338).
This group of standards is divided into the following parts:
1. 1 General
2. 2 Headed Fasteners
3. 3 Anchor channels
4. 4 Post-installed fasteners, mechanical systems
5. 5 Post-installed fasteners, chemical systems
Transfer of loads in the longitudinal direction of the channel:
For the anchor channels which are loaded with shear loads parallel to the channel axis there is
currently no definitive approach in CEN/TS 1992-4-3. However, shear loads which are not applied
normal to the anchor channel can be anchored in concrete in accordance with the existing
approaches for headed fasteners and post-installed fasteners (CEN/TS 1992-4, part 2 and 4).
Since, in this case, the differences in stiffness’s between concrete and steel must be taken into
account, a redistribution of the loads to the far edge anchors cannot be assumed. Therefore, in
CEN/TS the worst case is illustrated and the load carried only by the anchor closest to the edge. The
calculation approach taken by ESA for carrying loads in the longitudinal direction of the channel
follows this conservative model for the proof of the concrete edge as illustrated in Fig. 1.
Figure 1: Anchor channel under parallel load
Deutsche Kahneisen
Gesellschaft mbH
Nobelstraße 51, D-12057 Berlin
www.jordahl.de
JORDAHL ® ESA Methode
Engineering Solutions for Anchor Channels
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13.09.2011

JORDAHL ® ESA Methode
Engineering Solutions for Anchor Channels
Anchoring in lightweight concrete
As the load carrying capacity of the anchor channels depends essentially upon the behaviour of the
anchoring base, and if the anchoring is done into light weight concrete the concrete resistances are
adopted according to EC 2. The concrete cone resistance is determined by the E module and the
tensile strength of the concrete. The ESA method adjusts the resistances depending upon the bulk
density and taking into account the strength of the selected lightweight concrete.
Combined tension and shear loads
In CEN/TS 1992-4-3 a simplified interaction equation β N α + β V α ≤ 1.0 is specified together with the
use of exponents α = 2.0 for steel failure and α = 1.5 for concrete failure.
According to the design approach from ESA, these combinations are maintained separately in
accordance with the materials and the associated governing resistances. Therefore, due to the
different exponents, two interaction functions are obtained which should be taken into account
during the verification. This method has already been implemented in the international valid Fibcode
for fastenings. Using this more accurate ESA approach it is possible in many application cases
to achieve higher loadings.
Deutsche Kahneisen
Gesellschaft mbH
Nobelstraße 51, D-12057 Berlin
www.jordahl.de
JORDAHL ® ESA Methode
Engineering Solutions for Anchor Channels
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13.09.2011

JORDAHL ® ESA Methode
Engineering Solutions for Anchor Channels
Resistance against concrete edge failure by ESA
In collaboration with the University of Dortmund and the DIBT the anchor channels JTA-CE were
examined against shear forces in concrete. The resulting research findings allow a significant
increase in the shear capacity of JORDAHL JTA CE anchor channels both in cracked and un-cracked
concrete. The new results of JORDAHL research from DIBT were introduced in the European
Organisation of Technical Approvals (EOTA), and now are the part of European Technical Approval
(ETA).
From the JORDAHL-EXPERT version 1.2.1.14 the design is based on ESA method according to new
European Technical Approval (ETA).
Deutsche Kahneisen
Gesellschaft mbH
Nobelstraße 51, D-12057 Berlin
www.jordahl.de
JORDAHL ® ESA Methode
Engineering Solutions for Anchor Channels
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13.09.2011