oSIST prEN 10080:2023

Steel for the reinforcement of concrete - Weldable reinforcing steel - General

1.1   This document specifies general requirements and definitions for the essential characteristics of weldable reinforcing steel used for the reinforcement of concrete structures, delivered as finished products in the form of:
-   bars (including those produced by the reinforcing steel manufacturer from coil);
-   coils;
-   sheets of factory-made machine-welded fabric;
-   lattice girders.
1.2   Steels according to this document have a ribbed, indented or smooth surface.
NOTE 1   The protrusions between indentations of indented reinforcing steel have the same function as transverse ribs of ribbed reinforcing steel. There is no definition which specifies the difference between ribbed and indented surface geometry. Therefore, in this document, the same bond parameters are used for ribbed and indented steel.
1.3   This document does not apply to:
-   non-weldable reinforcing steel;
-   galvanized reinforcing steel;
-   epoxy-coated reinforcing steel;
-   corrosion resistant reinforcing steel;
-   prestressing steels;
-   indented strip;
-   further processing by a processor, e.g. de-coiling/straightening, cutting or cutting and bending.
NOTE 2   Further processing could influence some essential characteristics of the product.

Stahl für die Bewehrung von Beton - Schweißgeeigneter Betonstahl - Allgemeines

1.1   Dieses Dokument legt allgemeine Anforderungen und Definitionen für die Leistungsmerkmale von schweißgeeignetem Betonstahl fest, der für die Bewehrung von Betonbauwerken verwendet und als Fertigerzeugnis geliefert wird in Form von:
-   Stäben (einschließlich bei dem Stahlhersteller vom Ring abgewickelten Erzeugnissen);
-   Ringen;
-   werkmäßig gefertigten maschinell geschweißten Matten;
-   Gitterträgern.
1.2   Stähle nach diesem Dokument haben eine gerippte, profilierte oder glatte Oberfläche.
ANMERKUNG 1   Die Erhebungen zwischen zwei Vertiefungen bei profiliertem Betonstahl haben die gleichen Funktionen wie die Schrägrippen bei geripptem Betonstahl. Daher gibt es keine Sonderdefinition mit dem Unterschied der geometrischen Merkmale zwischen dem gerippten und profilierten Betonstahl. Die in diesem Dokument enthaltenen Festlegungen für den Verbund gelten für gerippten und profilierten Betonstahl.
1.3   Dieses Dokument gilt nicht für
-   nicht schweißgeeigneten Betonstahl;
-   verzinkten Betonstahl;
-   epoxibeschichteten Betonstahl;
-   korrosionsbeständigen Betonstahl;
-   Spannstahl;
-   profiliertes Band;
-   Weiterverarbeitung, z. B. abwickeln / richten, schneiden oder schneiden und biegen.
ANMERKUNG 2   Die Weiterverarbeitung kann manche Leistungsmerkmale des Erzeugnisses beeinflussen.

Aciers pour l'armature du béton - Aciers soudables pour béton armé - Généralités

1.1   Le présent document énonce les définitions et exigences générales relatives aux caractéristiques essentielles des aciers pour béton armé soudables utilisés pour l’armature des structures en béton, livrés comme produits finis sous forme de :
-   barres (y compris celles produites par le producteur d’acier pour béton armé à partir de bobines) ;
-   bobines ;
-   panneaux de treillis soudé par machine en usine ;
-   treillis raidisseurs.
1.2   Les aciers dans le présent document ont une surface à verrous ou empreintes ou lisse.
NOTE 1   Les reliefs entre les empreintes des aciers pour béton armé à empreintes ont la même fonction que les verrous transversaux des aciers pour béton armé à verrous. Aucune définition ne précise la différence entre les géométries des surfaces à verrous et à empreintes. Par conséquent, dans le présent document, les paramètres d’accrochage utilisés pour les aciers à verrous et à empreintes sont les mêmes.
1.3   Le présent document ne s’applique pas aux :
-   aciers pour béton armé non soudables ;
-   aciers pour béton armé galvanisés ;
-   aciers pour béton armé recouverts d’époxyde ;
-   aciers pour béton armé résistants à la corrosion ;
-   aciers pour armatures de précontrainte ;
-   feuillards crantés ;
-   transformations ultérieures par un transformateur - comme le déroulage/dressage, la coupe à longueur ou la coupe et façonnage.
NOTE 2   Les transformations ultérieures sont susceptibles de modifier certaines caractéristiques essentielles du produit.

Jeklo za armiranje betona - Varivo armaturno jeklo - Splošno

General Information

• Status: Not Published
• Public Enquiry End Date: 11-Apr-2023
• ICS: 77.140.15 - Steels for reinforcement of concrete
• Technical Committee: IFEK - Ferrous metals
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 24-Jan-2023
• Due Date: 13-Jun-2023
• Completion Date: 12-Apr-2023
• Directive: 305/2011 - Regulation (eu) No 305/2011 of the European Parliament and of the Council of 9 march 2011 laying down harmonised conditions for the marketing of construction products and repealing council directive 89/106/eec
• Mandate: M/115 - Mandate to CEN/CENELEC concerning the execution of standardization work for harmonized standards on reinforcing and prestress. steel for concrete
• Ref Project: prEN 10080 - Steel for the reinforcement of concrete - Weldable reinforcing steel - General

Relations

• Replaces: SIST EN 10080:2005 - Steel for the reinforcement of concrete - Weldable reinforcing steel - General
• Effective Date: 26-Jan-2022
• Revised: SIST EN 10080:2005 - Steel for the reinforcement of concrete - Weldable reinforcing steel - General
• Effective Date: 19-Jan-2023
• Revises: SIST EN 10080:2005 - Steel for the reinforcement of concrete - Weldable reinforcing steel - General
• Effective Date: 18-Jan-2023

Overview

prEN 10080 (CEN) establishes the general requirements and definitions for weldable reinforcing steel used to reinforce concrete. The document covers finished products delivered as bars, coils, factory-made machine-welded fabric and lattice girders. It addresses surface geometries (ribbed, indented or smooth) and sets out essential characteristics such as weldability, bond, mechanical properties, tolerances, durability and assessment procedures.

This draft European Standard has been prepared by CEN/TC 459/SC 4 and is intended to supersede EN 10080:2005 when adopted.

Key Topics

• Scope and product forms: Applies to bars (including those formed from coil), coils, welded fabric and lattice girders delivered as finished products. Excludes non-weldable, galvanized, epoxy-coated, corrosion-resistant, prestressing steels and certain further-processed items.
• Surface types and bond: Recognises ribbed, indented and smooth surfaces. For ribbed and indented steels the same bond parameters are used because the functional protrusions serve equivalent bond roles.
• Essential characteristics:
  • Weldability – requirements and testing to confirm safe welding practices for reinforcement products.
  • Strength & ductility – tensile and cyclic performance, fatigue and elevated-temperature considerations where applicable.
  • Bond strength – methods to assess anchorage and interaction with concrete based on surface geometry or specific bond tests.
  • Sections & tolerances – diameter, cross-sectional area, mass per metre, lengths, coil mass and dimensional tolerances for welded fabric and lattice girders.
  • Durability – requirements relevant to the product’s intended lifespan in concrete structures.
• Assessment and verification (AVCP): Defines product type testing, factory production control (FPC), initial inspection, continuous surveillance, audit testing and procedures for modifications.
• Test methods and identification: Specifies test conditions, bend/re-bend, cyclic and fatigue tests, shear force testing for welds or clamps, and identification/marking of manufacturers and products.

Applications

prEN 10080 is directly applicable to professionals and organisations involved in:

• Manufacturing and quality control of weldable reinforcing steel products (bars, coils, welded fabric, lattice girders).
• Structural engineers specifying reinforcement for concrete elements where welded connections and reliable bond performance are required.
• Testing laboratories performing AVCP, bond and weldability tests.
• Procurement and compliance teams seeking harmonised European requirements for reinforcement materials.

Practical benefits include clearer product designations, harmonised test and inspection regimes, and improved consistency of weldability, bond performance and mechanical properties across suppliers.

Related Standards

• EN 10080:2005 (to be superseded by this draft) - earlier version covering similar topics.
• Other CEN standards and national regulations addressing concrete design, corrosion protection, prestressing steels and coating systems (note: prEN 10080 explicitly excludes coated and corrosion-resistant reinforcing steels).

For specification and procurement, reference prEN 10080 alongside relevant concrete design codes and local AVCP rules to ensure conformity and durable performance of reinforcement in concrete structures.

Standards Content (Sample)

SLOVENSKI STANDARD
01-marec-2023
Nadomešča:
SIST EN 10080:2005
Jeklo za armiranje betona - Varivo armaturno jeklo - Splošno
Steel for the reinforcement of concrete - Weldable reinforcing steel - General
Stahl für die Bewehrung von Beton - Schweißgeeigneter Betonstahl - Allgemeines
Aciers pour l'armature du béton - Aciers soudables pour béton armé - Généralités
Ta slovenski standard je istoveten z: prEN 10080
ICS:
77.140.15 Jekla za armiranje betona Steels for reinforcement of
concrete
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
January 2023
ICS 77.140.15 Will supersede EN 10080:2005
English Version
Steel for the reinforcement of concrete - Weldable
reinforcing steel - General
Aciers pour l'armature du béton - Aciers soudables Stahl für die Bewehrung von Beton -
pour béton armé - Généralités Schweißgeeigneter Betonstahl - Allgemeines
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 459/SC 4.
If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 10080:2023 E
worldwide for CEN national Members.

Contents Page
European foreword . 5
Introduction . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Symbols . 13
5 Designation. 16
5.1 Bar and coil . 16
5.2 Welded fabric . 17
5.3 Lattice girders . 18
6 Steelmaking and manufacturing processes . 21
7 Essential characteristics . 22
7.1 Weldability . 22
7.2 Essential strength and ductility characteristics . 24
7.2.1 General . 24
7.2.2 Shear force of welded or clamped joints . 24
7.2.3 Fatigue strength . 26
7.2.4 Bendability . 26
7.2.5 Strength at elevated temperatures for bars, coils, welded fabric and lattice girders . 26
7.2.6 Cyclic load strength for bars, coils and welded fabric . 26
7.3 Sections and tolerances on sizes. 26
7.3.1 General . 26
7.3.2 Diameters and cross-sectional area . 26
7.3.3 Mass per meter and tolerances . 28
7.3.4 Length of bars . 28
7.3.5 Coil mass . 28
7.3.6 Dimensions of welded fabric . 28
7.3.7 Dimensions of lattice girders . 29
7.4 Bond strength . 30
7.4.1 General . 30
7.4.2 Bonding strength based on surface geometry . 30
7.4.3 Bonding strength based on bond strength tests . 32
7.5 Durability . 32
8 Assessment and verification of constancy of performance (AVCP) . 33
8.1 General . 33
8.2 Product type testing . 33
8.2.1 General . 33
8.2.2 Test samples and testing . 34
8.2.3 Compliance criteria . 40
8.2.4 Re-testing . 41
8.2.5 Test report . 41
8.3 Factory production control (FPC) . 41
8.3.1 General . 41
8.3.2 Requirements . 42
8.4 Initial inspection of factory and of FPC . 52
8.5 Continuous surveillance of FPC . 52
8.5.1 General . 52
8.5.2 Audit testing of samples taken from the factory . 53
8.5.3 Evaluation, reporting and action . 59
8.5.4 Compliance criteria . 59
8.6 Procedure for modifications . 62
9 Test methods . 62
9.1 Conditions of testing . 62
9.2 Testing weldability and durability . 63
9.3 Bend- and Re-bend test . 63
9.4 Cyclic load test . 64
9.5 Fatigue strength test . 64
9.5.1 General . 64
9.5.2 Bonding strength based on surface geometry. 64
9.5.3 Bonding strength based on bonding strength tests . 65
9.6 Tensile tests . 65
9.7 Tensile testing at elevated temperature . 65
9.8 Shear force testing . 65
9.9 Testing sections and tolerances on sizes . 65
10 Identification of the manufacturer and the product . 65
10.1 General . 65
10.2 Bar . 66
10.2.1 Identification of the manufacturer . 66
10.2.2 Identification of the product . 68
10.3 Coil . 69
10.4 Welded fabric . 70
10.5 Lattice girders . 70
Annex A (informative) Examples of weld points in lattice girder joints . 71
Annex B (normative) Test methods for lattice girders . 72
B.1 General . 72
B.2 Measurement of the dimensions of the lattice girder . 72
B.2.1 Test piece . 72
B.2.2 Test equipment . 72
B.2.3 Measuring procedure . 72
B.3 Shear test . 72
B.3.1 Shear test on weld points . 72
B.3.2 Shear test on clamped joints . 74
B.3.3 Test apparatus . 76
B.3.4 Test piece . 76
B.3.5 Test procedure . 76
Annex C (normative) Bond test for ribbed and indented reinforcing steel – Beam test . 77
C.1 Scope . 77
C.2 Principle of the test . 77
C.3 Samples and specimens . 77
C.4 Test equipment . 78
C.4.1 Moulds for the test beams . 78
C.4.2 Steel hinges . 78
C.4.3 System for regulating forces . 78
C.4.4 Force application system . 78
C.4.5 Instruments for measuring forces . 79
C.4.6 Instruments for measuring slip . 79
C.5 Preparation of samples . 79
C.5.1 Reinforcing steel to be tested . 79
C.5.2 Auxiliary reinforcement . 79
C.5.3 Plastic sleeves . 79
C.5.4 Concrete . 79
C.6 Execution of the tests . 80
C.7 Test results . 80
C.7.1 Calculation of the bond stress . 80
C.7.2 Values of bond stress . 81
C.8 Test report . 81
C.9 Determination of declared values for τ and τ and rib geometry requirements
bm bu
for FPC and continuous surveillance. 82
C.9.1 Declared bond strength values τ and τ . 82
bm bu
C.9.2 Rib geometry requirements for factory production control and continuous
surveillance . 83
Annex ZA (informative) Relationship of this European Standard with Regulation (EU) No
305/2011 . 87
ZA.1 Scope and relevant characteristics . 87
ZA.2 System of Assessment and Verification of Constancy of Performance (AVCP) . 89

ZA.3 Assignment of AVCP tasks . 90
Bibliography . 91

European foreword
This document (prEN 10080:2023) has been prepared by Technical Committee CEN/TC 459 “ECISS -
European Committee for Iron and Steel Standardization” , the secretariat of which is held by AFNOR.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 10080:2005.
This document has been prepared under Mandate M/115 rev. 1:2009-05 given to CEN by the European
Commission and the European Free Trade Association, and supports essential requirements of
EU Regulation (EU) No 305/2011.
For relationship with EU Regulation (EU) No 305/2011, see informative Annex ZA, which is an integral
part of this document.
— normative references and definitions updated;
— Table 2 with chemical composition revised;
— statements concerning testing, i.e. bond testing, fatigue, etc. revised, including new figure;
— clauses concerning the assessment and verification of constancy of performance (AVCP) revised;
— new figures and statements in Clause 10 concerning identification of manufacturer and products;
— Annex D and E (i.e. pull-out test and comparison of steel grades) deleted;
— Annex ZA updated according to the actual requirements.
Additional editorial changes have been made.

Through its sub-committee SC 4 “Concrete reinforcing and prestressing steels” (secretariat: DIN).”
Introduction
This document does not define levels or classes. They should be defined in accordance with this document
by values for R , R , A , R /R R /R (if applicable), fatigue strength (if required), cyclic load
m e gt m e, e,act. e,nom.
strength (if required), strength at elevated temperature (if required), bendability, weldability, bond
strength, shear force of welded or clamped joints (for welded fabric or lattice girders) and tolerances on
dimensions.
1 Scope
1.1 This document specifies general requirements and definitions for the essential characteristics of
weldable reinforcing steel used for the reinforcement of concrete structures, delivered as finished
products in the form of:
— bars (including those produced by the reinforcing steel manufacturer from coil);
— coils;
— sheets of factory-made machine-welded fabric;
— lattice girders.
1.2 Steels according to this document have a ribbed, indented or smooth surface.
NOTE 1 The protrusions between indentations of indented reinforcing steel have the same function as
transverse ribs of ribbed reinforcing steel. There is no definition which specifies the difference between ribbed and
indented surface geometry. Therefore, in this document, the same bond parameters are used for ribbed and
indented steel.
1.3 This document does not apply to:
— non-weldable reinforcing steel;
— galvanized reinforcing steel;
— epoxy-coated reinforcing steel;
— corrosion resistant reinforcing steel;
— prestressing steels;
— indented strip;
— further processing by a processor, e.g. de-coiling/straightening, cutting or cutting and bending.
NOTE 2 Further processing could influence some essential characteristics of the product.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 1766:2017, Products and systems for the protection and repair of concrete structures — Test methods
— Reference concretes for testing
EN 10020:2000, Definition and classification of grades of steel
EN 10079:2007, Definition of steel products
EN 12390-3:2019, Testing hardened concrete — Part 3: Compressive strength of test specimens
EN ISO 6892-2:2018, Metallic materials — Tensile testing — Part 2: Method of test at elevated temperature
(ISO 6892-2:2018)
EN ISO 7500-1:2018, Metallic materials — Calibration and verification of static uniaxial testing machines
— Part 1: Tension/compression testing machines — Calibration and verification of the force-measuring
system (ISO 7500-1:2018)
EN ISO 15630-1:2019, Steel for the reinforcement and prestressing of concrete — Test methods — Part 1:
Reinforcing bars, rods and wire (ISO 15630-1:2019)
EN ISO 15630-2:2019, Steel for the reinforcement and prestressing of concrete — Test methods — Part 2:
Welded fabric and lattice girders (ISO 15630-2:2019)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 10020:2000 and
EN 10079:2007 and the following apply.
3.1
reinforcing steel
steel product with a circular or practically circular cross-section which is suitable for the reinforcement
of concrete
3.2
ribbed reinforcing steel
reinforcing steel with at least two rows of transverse ribs, which are uniformly distributed over the entire
length
3.3
longitudinal rib
uniform continuous protrusion parallel to the axis of the bar, rod or wire
3.4
transverse rib or indentation
any rib or protrusion between indentations on the surface of the bar, other than a longitudinal rib
3.5
rib height
a
m
distance from the highest point of the rib (transverse or longitudinal), or protrusion between
indentations, to the surface of the core, to be measured normal to the axis of the bar
3.6
rib or indentation spacing
c
distance between the centres of two consecutive transverse ribs or two consecutive protrusions between
indentations measured parallel to the axis of the bar
3.7
angle of transverse rib or indentation inclination
ß
angle between the axis of the transverse rib or protrusion between indentations and the longitudinal axis
of the bar
3.8
transverse rib or protrusion flank inclination
α
angle of the rib or protrusion flank, measured perpendicular to the longitudinal axis of the rib
3.9
relative rib area
f
R
area of the projection of all ribs or protrusions between indentations on a plane perpendicular to the
longitudinal axis of the bar, rod or wire, divided by the rib spacing and the nominal circumference
3.10
indented reinforcing steel
reinforcing steel with at least two rows of indentations, which are uniformly distributed over the entire
length
3.11
rib- or protrusion- top width
b
width of the top of a transverse rib or protrusion between indentations to be measured normal to the
axis of the transverse rib or protrusion
3.12
plain reinforcing steel
reinforcing steel with a smooth surface
3.13
coil
single length of reinforcing steel usually bar, rod or wire wound in concentric rings
3.14
nominal cross-sectional area
A
n
cross-sectional area equivalent to the area of a circular plain bar of the same nominal diameter, d
π d
(i.e. )
3.15
welded fabric
arrangement of longitudinal and transverse bars, rods or wires of the same or different nominal diameter
and length that are arranged substantially at right angles to each other and factory electrical resistance
welded together by automatic machines at all points of intersection
3.16
lattice girder
two or three-dimensional metallic structure comprising an upper chord, one or more lower chords and
continuous or discontinuous diagonals which are welded by machine or mechanically assembled to the
chords
3.17
specified value
any value which is defined in a standard and has not been measured or calculated with measured values
Note 1 to entry: A specified value can be a characteristic, a minimum, a maximum or any testing value and can be
declared by the manufacturer in his declaration of performance.
3.18
test parameter
any value which defines testing conditions such as e.g. testing temperature, specified maximum stress in
the fatigue test or bending diameter in the bend test
3.19
characteristic value
value of a material or product essential characteristic having a prescribed probability of not being
attained in a hypothetical unlimited test series
Note 1 to entry: This value generally corresponds to a specific fractile of the assumed statistical distribution of
the particular essential characteristic of the material or product.
3.20
minimum value
value below which no test result shall fall
3.21
maximum value
value which no test result shall exceed
3.22
factory production control
permanent internal control of production performed by the manufacturer
3.23
standard essential characteristic
essential characteristic which is included in this document as part of the factory production control
requirements for every test unit
3.24
special essential characteristic
essential characteristic (fatigue strength, cyclic load strength and strength at elevated temperature)
included in this document which is not determined as part of the factory production control requirements
for every test unit
3.25
standard welded fabric
welded fabric manufactured according to specified delivery conditions and available from stock
3.26
purpose made welded fabric
welded fabric manufactured according to user's specific requirements
3.27
longitudinal wire
reinforcing steel in the manufacturing direction of the welded fabric
3.28
transverse wire
reinforcing steel perpendicular to the manufacturing direction of the welded fabric
3.29
twin wires
two wires of the same level or class and nominal diameter placed adjacent to each other as a pair in
welded fabrics
3.30
pitch of welded fabric
centre-to-centre distance of wires in a sheet of welded fabric
Note 1 to entry: For twin wire fabric the pitch is measured between the tangents of the adjacent wires.
3.31
overhang of welded fabric
u , u , u , u
1 2 3 4
length of longitudinal or transverse wires projecting beyond the centre of the outer crossing wire in a
sheet of welded fabric
Note 1 to entry: For twin wire welded fabric the overhang is measured from the tangent line of the adjacent wires.
3.32
length of a welded fabric sheet
L
dimension of the longest side of a sheet of welded fabric
3.33
width of a welded fabric sheet
B
dimension of the shortest side of the sheet of welded fabric
3.34
standard lattice girder
lattice girder manufactured according to specified delivery conditions and available from stock
3.35
purpose made lattice girder
lattice girder manufactured according to user's specific requirements
3.36
lower chord
set of longitudinal reinforcing steels placed in the lower part of a lattice girder
Note 1 to entry: The constituent longitudinal reinforcing steels of the lower chord can be interlinked or not.
3.37
upper chord
longitudinal reinforcement placed in the upper part of a lattice girder, of which the base steel is either a
reinforcing steel or a steel strip
3.38
diagonals
reinforcing steels linking the upper and lower chord of a lattice girder
Note 1 to entry: They form harmonic curves in the case of continuous diagonals or are independent elements in
the case of discontinuous diagonals.
3.39
lattice girder length
L
overall length of a lattice girder
3.40
design height of a lattice girder
H
distance between the lowest point of the lower chord and the highest point of the upper chord
3.41
overall height of a lattice girder
H
distance between the lowest point and the highest point of a lattice girder
3.42
lattice girder overhang
u u
1, 2
length of the diagonals beyond either the upper chord (u ) or the lower chord (u )
1 2
3.43
design width of a lattice girder
B
distance between the outlying points of the lower chords
3.44
overall width of a lattice girder
B
distance between the outlying points of a lattice girder
3.45
pitch of diagonals
P
s
distance between equivalent consecutive junction points of the diagonals with the chords
3.46
angle of inclination of diagonals
ϑ
angle between the axis of a diagonal and the longitudinal axis of a lattice girder in the plane of the diagonal
in the middle of the height of a lattice girder
3.47
class
range of levels, delimited by a minimum and a maximum value, of performance of a construction product
Note 1 to entry: Definition according to CPR.
3.48
threshold level
means of a minimum or maximum performance level of an essential characteristic of a construction
product
Note 1 to entry: Definition according to CPR.
3.49
level
result of the assessment of the performance of a construction product in relation to its essential
characteristics, expressed as a numerical value
3.50
cast
metal taken from the same melt in a furnace or ladle or from several melts mixed in the same furnace or
ladle
3.51
test unit
defined quantity of bars, rods, wires, welded fabric or lattice girders which is considered to be produced
under uniform conditions, and from which a representative test sample is to be taken
Note 1 to entry: Welded fabric or lattice girders that can be considered as produced under conditions which are
presumed uniform and can be represented by a test sample.
3.52
acceptance quality limit
quality level of a test unit corresponding to a predetermined acceptance probability on the operating
characteristic curve
3.53
operating characteristic curve
curve showing, for a given sampling plan, the probability that an acceptance criterion is satisfied, as a
function of the quality level of a test unit
4 Symbols
Symbols used in this European Standard are listed in Table 1.
Table 1 — List of symbols
Symbol Description Unit
A
Nominal cross-sectional area of chord
mm
Ch
A
Nominal cross-sectional area of diagonal mm
Di
A
Percentage total elongation at maximum force %
gt
A
Nominal cross-sectional area
mm
n
a a , a , a a
Increment depending on acceptance quality limit
1, 2 3 4
a
Rib height mm
m
B Length of transverse wire in welded fabric mm
B
Design width of lattice girder mm
B
Overall width of lattice girder mm
b Width of the beam (beam test, see Annex C) mm
b Width of rib top perpendicular to transverse rib mm
b
Rib top width in the direction of bar axis mm
r
C
Carbon equivalent value (CEV) % by mass
eq
C a
Specified characteristic value
v
c Transverse rib or indentation spacing mm
d Nominal diameter of the reinforcing steel mm
d
Diameter of transverse wires in welded fabric mm
C
d
Bend diameter (beam test) mm
m
d
Maximum bend diameter mm
m,max
d
Diameter of longitudinal wires in welded fabric mm
L
d
Nominal diameter of the single wires mm
s
d
Nominal diameter of the twin wires mm
T
e Gap between rib or indentation rows mm
F
Total force applied (beam test) kN
a
F
Shear force of a clamped joint in lattice girder kN
d
F
Force in hinge and bar or wire (beam test) kN
i
F
Shear force of welded connections in welded fabric kN
s
F
Shear force of a single weld in lattice girder kN
w
f Frequency Hz
b
f
Tensile strength of the concrete MPa
ct
b
f
Average splitting strength of concrete MPa
cts
Symbol Description Unit
f
Relative rib area -
R
f
Single calculated value of relative rib area -
R,actual
f
5 % fractile value of relative rib area at 90 % probability -
R5%,90%
H
Design height of lattice girder mm
H
Overall height of lattice girder mm
k Coefficient as a function of the number of test results -
L Length of longitudinal wire in welded fabric, or length of lattice girder mm
N Number of load cycles in the axial load fatigue test -
N
Number of transverse wires in welded fabric -
C
N
Number of longitudinal wires in welded fabric -
L
N
Number of load cycles in the cyclic load test -
CLS
P
Pitch of transverse wires in welded fabric mm
C
P
Pitch of longitudinal wires in welded fabric mm
L
P
Pitch of diagonals of lattice girder mm
s
p Fractile for a given confidence interval (1-α = 0,90) -
b
R
Yield strength MPa
e
b
R
Actual value of yield strength
MPa
e,act.
R /R
Ratio actual value of yield strength / nominal value of yield strength -
e,act. e,nom.
b
R
Nominal yield strength of the chord in lattice girder
MPa
e,Ch
b
R
Nominal yield strength of the diagonal in lattice girder MPa
e,Di
b
R
Upper yield strength MPa
eH
b
R
Tensile strength
MPa
m
R /R
Ratio tensile strength/yield strength -
m e
b
R
Nominal value of yield strength
MPa
e,nom.
b
R
0,2 % proof strength, non-proportional extension MPa
p0,2
R
Yield strength at elevated temperature MPa
T
a
s Estimate of the standard deviation
T Temperature °C
t Depth of indentation mm
t
Thickness of metal strip in lattice girder mm
s
Overhang of the longitudinal wires in welded fabric or length of the diagonals
u , u
mm
1 2
beyond the upper or lower chord of a lattice girder
u u
Overhang of the transverse wires in welded fabric mm
3, 4
Symbol Description Unit
a
Average value of test results
x
α Angle of transverse rib flank inclination o
ß Angle of transverse rib or indentation inclination o
Σe Sum of gaps mm
Δf 100*(f – f )/ f
%
R R,actual R5%,90% R5%,90%
ε
Compression and tension strain in the cyclic load test %
c
Δw, Δp, Δo Deviation of width, pitch and overhang mm
b
σ
Maximum stress in the fatigue test
MPa
max.
b
2σ
Stress range in the axial load fatigue test
MPa
a
b
σ
Compression and tension stress in the cyclic load test MPa
c
b
σ
Stress in the bar or wire (beam test)
MPa
s
b
τ
Bond stress (beam test)
MPa
bm
b
τ
Bond stress at maximum force (beam test)
MPa
bu
τ
b
τ , τ , Bond stress at 0,01 mm, 0,1 mm and 1 mm slip (beam test)
1 MPa
0,01 01,
ϑ Inclination of the diagonals in lattice girder o
a
The unit depends on the essential characteristic.
b 2
1 MPa = 1 N/mm .
5 Designation
5.1 Bar and coil
The products covered by this European Standard should be designated with the following information:
a) designation of the product form (i.e. bar, coil);
b) number of this European Standard;
c) nominal dimensions of the product;
d) steel designation.
NOTE 1 The Construction Products Regulation (EU) No 305/2011 contains provisions for the designation of
products.
NOTE 2 Steel designation can be either the manufacturer's number and its product number or the full set of
essential characteristics. In addition, a reference to a national designation specifying the full set of essential
characteristics may be given.
5.2 Welded fabric
Welded fabric should be designated with the following information:
a) designation of the product form (welded fabric);
b) number of this European Standard;
c) nominal dimensions of the product (dimensions of the wires, dimensions of the sheet, pitch of wires,
overhangs);
d) steel designation according to EN 10027-1:2016.
NOTE Brief designations are widely used to describe standard welded fabric. The relevant mesh arrangement
can be seen from the tabulated data issued by the manufacturer.
Purpose made welded fabric can be described using the indications given in Figure 1, or by a fully
dimensioned drawing, and should be identified by the user's reference.
Steel designation can be either the manufacturer's number and its product number or the full set of
essential characteristics. In addition, a reference to a national designation specifying the full set of
essential characteristics may be given.
Key
N number of longitudinal wires L length of longitudinal wire
L
P pitch of longitudinal wires B length of transverse wire
L
d diameter of longitudinal wires u overhang of the longitudinal wires
L 1
N number of transverse wires u overhang of the longitudinal wires
C 2
P pitch of transverse wires u overhang of the transverse wires
C 3
d diameter of transverse wires u overhang of the transverse wires
C 4
Figure 1 — Geometrical characteristics of purpose made welded fabric
5.3 Lattice girders
Lattice girders (see examples in Figures 2 and 3 should be designated with the following information:
a) designation of the product form (lattice girder);
b) number of this European Standard;
c) design height of the lattice girder (in case of special lattice girder it is allowable to use the overall
height when this is clearly stated);
d) nominal dimensions of the product (upper chord, diagonal and lower chord);
e) steel designation.
Lattice girders can be described using the indications given in Figure 2, or by a fully dimensioned drawing
and should be identified by the user's reference.
Steel designation can be either the manufacturer's number and its product number or the full set of
essential characteristics. In addition, a reference to a national designation specifying the full set of
essential characteristics may be given.

a) b)
c)
Key
1 upper chord
2 diagonal
3 lower chord
Figure 2 — Height (H , H ), width (B , B ), overhang (u , u ) and pitch of
1 2 1 2 1 2
diagonals (P ) of a lattice girder
s
Dimensions in millimetres
a)
b)
c)
Key
1 upper chord
2 diagonal
3 lower chord
Figure 3 — Lattice girder with upper chord made of indented strip
6 Steelmaking and manufacturing processes
6.1 The melting process and type of de-oxidation of the steel is at the discretion of the steel
manufacturer.
6.2 The manufacturing process for the production of coils and bars is at the discretion of the
manufacturer. It shall be reported to the purchaser if requested.
Production processes for reinforcing steel according to this standard are:
— hot rolled (with no further treatment);
— hot rolled and heat treated;
— hot rolled and cold st
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