CEN/TS 1992-4-2:2009

SLOVENSKI STANDARD
oSIST-TS prCEN/TS 1992-4-2:2008
01-september-2008
Projektiranje pritrjevanja za uporabo v betonu - 4-2: Glavna pritrjevala
Design of fastenings for use in concrete - Part 2: Headed Fasteners
Bemessung von Befestigungen in Beton - Teil 2: Kopfbolzen
Ta slovenski standard je istoveten z: prCEN/TS 1992-4-2
ICS:
21.060.01 Vezni elementi na splošno Fasteners in general
91.080.40 Betonske konstrukcije Concrete structures
oSIST-TS prCEN/TS 1992-4-2:2008 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST-TS prCEN/TS 1992-4-2:2008

oSIST-TS prCEN/TS 1992-4-2:2008
TECHNICAL SPECIFICATION
FINAL DRAFT
prCEN/TS 1992-4-2
SPÉCIFICATION TECHNIQUE
TECHNISCHE SPEZIFIKATION
June 2008
ICS 21.060.01; 91.080.40
English Version
Design of fastenings for use in concrete - Part 2: Headed
Fasteners
Bemessung von Befestigungen in Beton - Teil 2:
Kopfbolzen
This draft Technical Specification is submitted to CEN members for formal vote. It has been drawn up by the Technical Committee CEN/TC
250.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
Warning : This document is not a Technical Specification. It is distributed for review and comments. It is subject to change without notice
and shall not be referred to as a Technical Specification.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2008 CEN All rights of exploitation in any form and by any means reserved Ref. No. prCEN/TS 1992-4-2:2008: E
worldwide for CEN national Members.

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Contents Page
Foreword.3
1 Scope .4
1.1 General.4
2 Normative references .4
3 Definitions and symbols .4
4 Basis of design .4
5 Determination of action effects.5
5.3 Tension forces in a supplementary reinforcement .5
5.3.1 General.5
5.3.2 Fasteners loaded in tension .5
5.3.3 Fixtures loaded in shear .5
6 Verification of ultimate limit state by elastic analysis .6
6.1 General.6
6.2 Tension load.6
6.2.1 Required verifications .6
6.2.2 Detailing of supplementary reinforcement .7
6.2.3 Steel failure of fastener .8
6.2.4 Pull-out failure of fastener .8
6.2.5 Concrete cone failure .8
6.2.6 Splitting failure.13
6.2.7 Blow-out failure.14
6.2.8 Steel failure of the supplementary reinforcement.17
6.2.9 Anchorage failure of the supplementary reinforcement in the concrete cone .17
6.3 Shear load.18
6.3.1 Required verifications .18
6.3.2 Detailing of supplementary reinforcement .18
6.3.3 Steel failure of fastener .19
6.3.4 Concrete pry-out failure .21
6.3.5 Concrete edge failure .22
6.4 Combined tension and shear load.29
6.4.1 Fastenings without supplementary reinforcement .29
7 Fatigue .30
8 Seismic .30

oSIST-TS prCEN/TS 1992-4-2:2008
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Foreword
This document (prCEN/TS 1992-4-2:2008) has been prepared by Technical Committee CEN/TC 250
“Structural Eurocodes”, the secretariat of which is held by BSI.
This document is currently submitted to the Formal Vote.
The Technical Specification CEN/TS 1992-4–2 — Headed fasteners, describes the principles and
requirements for safety, serviceability and durability of headed fasteners for use in concrete. It is based on
the limit state concept used in conjunction with a partial factor method.
CEN/TS 1992-4 'Design of fastenings for use in concrete' is subdivided into the following parts:
 Part 1: General
 Part 2: Headed fasteners
 Part 3: Anchor channels
 Part 4: Post-installed fasteners — mechanical systems
 Part 5: Post-installed fasteners — chemical systems
Relation to Part 1 of this Technical Specification TS
The principles and requirements of Part 2 of this TS are additional to those in Part 1, all the clauses and sub-
clauses of which also apply to Part 2 unless varied in this Part. Additional information is presented under the
relevant clauses/sub-clauses of Part 1 of the TS. The numbers for the clauses/sub-clauses of Part 2 continue
from the number of the last relevant clauses/sub-clauses of Part 1.
The above principles also apply to Figures and Tables in Part 2.

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1 Scope
1.1 General
1.1.6 This document relies on characteristic resistances and distances which are stated in a European
Technical Specification. In minimum the following characteristics should be given in a European Technical
Specification as base for the design methods of this CEN/TS:
 N , N , V
Rk,p Rk,s Rk,s
 M
Rk,s
 c , s
cr,N cr,N
 c , s
cr,sp cr,sp
 c , s , h
min min min
 limitations on concrete strength classes of base material
 k , k , k , k , k , k
cr ucr 2 4 6 7
 d , d , h , l
h nom ef f
 γ partial factors for material see also CEN/TS 1992-4-1:XXXX, clause 4
Mi
2 Normative references
This European Standard incorporates by dated or undated reference, provisions from other publications.
These normative references are cited at the appropriate places in the text and the publications are listed
hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to
this European Standard only when incorporated in it by amendment or revision. For undated references the
latest edition of the publication referred to applies.
NOTE The following references to Eurocodes are references to European Standards and European Prestandards.
These are the only European documents available at the time of publication of this TS. National documents take
precedence until Eurocodes are published as European Standards.
EN 1992-1-1, Eurocode 2: Design of concrete structures - Part 1-1: General rules and rules for buildings
CEN/TS 1992-4-1:XXXX, Design of Fastenings for use in Concrete — Part 1: General
EN 10080, Steel for the reinforcement of concrete — Weldable reinforcing steel — General
EN ISO 13918, Welding — Studs and ceramic ferrules for arc stud welding (ISO 13918:2008)
3 Definitions and symbols
Definitions and symbols are given in CEN/TS 1992-4-1.
4 Basis of design
4.5.4 Design of welding should be in accordance with EN 1993-1.
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4.5.5 The following assumptions in respect to installation have been made in this CEN/TS. The installation
instructions should reflect them:
1) The fastener should be fixed to the formwork or auxiliary constructions in a way that no movement of the
fastener will occur during placing of reinforcement or during pouring and compacting of the concrete.
2) Requirements for
 adequate compaction particularly under the head of the stud or fastener and under the fixture,
 provisions for vent openings in fixtures larger than 400 mm × 400 mm.
3) Requirement for inspection and approval of the correct installation of the fasteners by qualified personnel.
4) The following conditions should be observed if the fasteners are vibrated (not just punched) into the wet
concrete immediately after pouring:
 The size of the fixture does not exceed 200mm × 200mm and the number of fastenings is limited to
4 fasteners, so that it can be placed simultaneously during vibrating by the available personnel.
 The installation is done according to a quality system.
 The fastenings should not be moved after vibrating has been finished.
 The concrete under the head of the headed stud or anchor as well as under the base plate should be
properly compacted.
5) The welding procedure for studs should be done in accordance with the provisions given in the relevant
European Technical Specification.
6) Inspection and approval of the correct installation of the fasteners is carried out by appropriately qualified
personnel.
5 Determination of action effects
5.3 Tension forces in a supplementary reinforcement
5.3.1 General
Where supplementary reinforcement is provided, the design tension forces in the supplementary
reinforcement should be established using an appropriate strut and tie model. The supplementary
reinforcement should be designed to resist the total external load on the fastening.
5.3.2 Fasteners loaded in tension
The design tension forces N in the supplementary reinforcement should be calculated using the design
Ed, re
load on the fastener.
5.3.3 Fixtures loaded in shear
The design tension force N in the supplementary reinforcement caused by the design shear force V
Ed, re Ed
acting on a fixture is given by Equation (1).
e
 
s
(1)
N = + 1
Ed, re
z
 
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with (see Figure 1):
e = distance between reinforcement and shear force acting on a fixture
s
z = internal lever arm of the concrete member
≈ 0,85d
2 h
ef
d ≤ min

2 c
 1
If the supplementary reinforcement is not arranged in the direction of the shear force (see Figure 10c)) then
this must be taken into account in the calculation of the design tension force of the reinforcement.
In the case of different shear forces on the fasteners of a fixture, Equation (1) should be solved for the shear
h h
load V of the most loaded fastener resulting in N .
Ed Ed, re
Figure 1— Detailing of reinforcement to take up shear forces
6 Verification of ultimate limit state by elastic analysis
6.1 General
6.1.5 This section applies when forces on the fasteners have been calculated using elastic analysis.
Annex B of Part 1 should be used for plastic analysis.
6.1.6 The spacing between outer headed fasteners of adjoining groups or the distance to single fasteners
shall be a > s .
cr,N
6.2 Tension load
6.2.1 Required verifications
The required verifications are given in Table 1.
6.2.1.1 For fasteners without supplementary reinforcement the verifications of Table 1, lines 1 to 5 apply.
6.2.1.2 For fasteners with supplementary reinforcement the verifications of Table 1, lines 1, 2 and 4 to 7
apply.
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6.2.2 Detailing of supplementary reinforcement
When the design relies on supplementary reinforcement, concrete cone failure according to Equation (4)
needs not to be verified but the supplementary reinforcement should be designed to resist the total load.
The supplementary reinforcement to take up tension loads should comply with the following requirements
...