ISO 15835-1:2018

INTERNATIONAL ISO
STANDARD 15835-1
Second edition
2018-10
Steels for the reinforcement of
concrete — Reinforcement couplers
for mechanical splices of bars —
Part 1:
Requirements
Aciers pour l'armature du béton — Coupleurs d'armature destinés
aux raboutages mécaniques de barres —
Partie 1: Exigences
Reference number
©
ISO 2018
© ISO 2018
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ii © ISO 2018 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 2
5 Requirements . 3
5.1 General . 3
5.2 Categories of mechanical splices . 3
5.3 Strength and ductility under static forces . 4
5.3.1 General. 4
5.3.2 Strength . 4
5.3.3 Ductility . 4
5.4 Slip under static forces . 5
5.4.1 Testing requirements . 5
5.4.2 Slip requirement . 5
5.5 Properties under high-cycle fatigue loading (optional) . 6
5.5.1 Testing programme. 6
5.5.2 Fatigue performance . 6
5.5.3 S-N diagram (optional) . 7
5.6 Properties under low-cycle reverse loading (optional) . 7
5.7 Marking and traceability . 7
5.8 Installation instructions . 7
Annex A (informative) Items to be specified . 8
Bibliography . 9
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
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ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
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.org/iso/foreword .html.
The committee responsible for this document is ISO/TC 17, Steel, Subcommittee SC 16, Steels for the
reinforcement and prestressing of concrete.
This second edition cancels and replaces the first edition (ISO 15835-1:2009), which has been
technically revised with changes made to Clauses 1, 2, 3, 4 and 5, 3.2, 3.5, 5.2, 5.3, 5.5 and 5.6, Table 1,
and Annexes C and D. Clause 6 and Annexes A and B have been revised and have been moved out into a
new document: ISO 15835-3.
A list of all the parts in the ISO 15835 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/members .html.
iv © ISO 2018 – All rights reserved

INTERNATIONAL STANDARD ISO 15835-1:2018(E)
Steels for the reinforcement of concrete — Reinforcement
couplers for mechanical splices of bars —
Part 1:
Requirements
1 Scope
This document specifies requirements for couplers for the mechanical splicing of steel reinforcing bars.
More onerous requirements can be specified by the customer.
This document is applicable to the continuous production of coupler components. It is intended to be
used with adequate control measures for the processing of reinforcing bars, i.e. the production of the
mechanical splice.
This document specifies requirements for couplers used for mechanical splices in reinforced concrete
structures under predominantly static loads. It specifies additional requirements for couplers used in
structures subject to high-cycle elastic fatigue loading and/or low-cycle elastic-plastic reverse loading.
NOTE ISO 15835-3 specifies the quantity of tests.
Compression-only couplers such as end-bearing sleeves are not covered by the ISO 15835 series.
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.
ISO 15630-1, Steel for the reinforcement and prestressing of concrete — Test methods — Part 1: Reinforcing
bars, wire rod and wire
ISO 15835-2:2018, Steels for the reinforcement of concrete — Reinforcement couplers for mechanical
splices of bars — Part 2: Test methods
ISO 16020, Steel for the reinforcement and prestressing of concrete — Vocabulary
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 16020 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https: //www .iso .org/obp
— IEC Electropedia: available at http: //www .electropedia .org/
3.1
coupler length
actual length of the coupler including all load-transferring parts, if more than one, and including lock
nuts, if any
3.2
length of mechanical splice
coupler length plus two times the nominal bar diameter at both ends of the coupler
Note 1 to entry: This is a theoretical definition aimed at including the length of bar that could have been affected
by the bar-end preparation process.
3.3
mechanical splice
complete assembly of a coupler, including any additional intervening material or other components
providing a splice of two reinforcing bars
3.4
coupler
coupling sleeve or threaded coupler for mechanical splicing of reinforcing bars for the purpose of
providing transfer of axial tension and/or compression from one bar to the other where
— coupling sleeve is a device fitting over the ends of two reinforcing bars,
— threaded coupler is a threaded device for joining reinforcing bars with matching threads
3.5
slip
relative displacement between the components of a mechanical splice while being loaded to a defined
load level
3.6
slip measurement device
ensemble constituted by the extensometer and any system used to fasten it to the mechanical splice
3.7
batch
number of couplers of the same type and diameter, manufactured from the same cast of incoming
material, as a discrete unit defined by the manufacturer
3.8
lot
number of couplers of the same type and diameter, of various batches, delivered at the same time to the
same purchaser
4 Symbols
Table 1 — Symbols
Symbol Unit Designation
A % Percentage total elongation at maximum tensile force, F
gt max
d mm Nominal diameter of the reinforcing bar
F kN Maximum tensile force
max
N — Specified number of load cycles in high cycle fatigue test
Specified characteristic (or nominal) yield strength value of the rein-
a
R MPa
eH, spec
forcing bar
R MPa Yield strength value of the reference bar
eH
R MPa Specified (or nominal) tensile strength value of the reinforcing bar
m, spec
(R /R ) — Specified minimum tensile/yield strength ratio of the reinforcing bar
m eH spec
u mm Residual elongation after 20 cycles
a 2
1 MPa = 1 N/mm .
2 © ISO 2018 – All rights reserved

Table 1 (continued)
Symbol Unit Designation
2σ MPa Stress range for high-cycle fatigue test
a
σ MPa Maximum stress in axial load fatigue test
max
σ MPa Minimum stress in axial load fatigue test
min
a 2
1 MPa = 1 N/mm .
5 Requirements
5.1 General
The requirements apply to the coupler even though the verification of the properties of the coupler is
performed on a mechanical splice.
The technical requirements for couplers are related to the following properties where a) and b) are
mandatory while c) and d) are related to categories defined in 5.2:
a) strength and ductility under static forces;
b) slip under static forces;
c) properties under high-cycle fatigue loading in the elastic range;
d) properties under low-cycle reverse loading in the elastic-plastic range.
Testing of these properties shall be performed in accordance with ISO 15835-2.
Further requirements are specified for:
e) identification and marking;
f) installation instructions.
Additional requirements can exist in the reference standard for the steel reinforcing bars to be
connected in the mechanical splice. In this case, the purchaser and the supplier should agree on any
additional technical requirements.
If a material other than steel is used in a coupler, the suitability for use of such material in fire-rated
structures as well as any health and safety implications should be evaluated.
5.2 Categories of mechanical splices
Table 2 provides a summary of the categories of mechanical splices specified in this document, with
reference to the subclauses where the requirements and test methods for their properties are given.
a
Table 2 — Categories of mechanical splices
Requirement su
...