CEN/TS 17991:2023

SLOVENSKI STANDARD
01-februar-2024
Statistično preverjanje delnih faktorjev za stavbe v skladu z Evrokodom EN 1993-1
-1, Priloga E
Statistical verification of partial factors for buildings according to Eurocode EN 1993-1-1
Annex E
Statistischer Nachweis von Sicherheitsfaktoren für den Hochbau nach Eurocode EN
1993-1-1 Anhang E
Vérification statistique des coefficients partiels de sécurité pour la construction de
bâtiments selon Eurocode 1993-1-1 Annexe E
Ta slovenski standard je istoveten z: CEN/TS 17991:2023
ICS:
91.010.30 Tehnični vidiki Technical aspects
91.080.13 Jeklene konstrukcije Steel structures
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

CEN/TS 17991
TECHNICAL SPECIFICATION
SPÉCIFICATION TECHNIQUE
November 2023
TECHNISCHE SPEZIFIKATION
ICS 91.010.30; 91.080.13
English Version
Statistical verification of partial factors for buildings
according to Eurocode EN 1993-1-1 Annex E
Vérification statistique des coefficients partiels de Statistischer Nachweis von Sicherheitsfaktoren für den
sécurité pour la construction de bâtiments selon Hochbau nach Eurocode EN 1993-1-1 Anhang E
Eurocode 1993-1-1 Annexe E
This Technical Specification (CEN/TS) was approved by CEN on 22 October 2023 for provisional application.

The period of validity of this CEN/TS is limited initially to three years. After two years the members of CEN will be requested to
submit their comments, particularly on the question whether the CEN/TS can be converted into a European Standard.

CEN members are required to announce the existence of this CEN/TS in the same way as for an EN and to make the CEN/TS
available promptly at national level in an appropriate form. It is permissible to keep conflicting national standards in force (in
parallel to the CEN/TS) until the final decision about the possible conversion of the CEN/TS into an EN is reached.

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.
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. CEN/TS 17991:2023 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Statistical verification of partial factors for buildings - Requirements on the statistical
distribution of mechanical properties and products dimensions . 5
4.1 General. 5
4.2 Practical procedure and permissible deviations . 6
4.3 Methodology of statistical verification . 6
5 Other methods for the verification of partial factors for buildings . 6
6 Procedures for the different steel products . 6
6.1 General. 6
6.2 Hot-rolled sections . 7
6.2.1 General. 7
6.2.2 Mechanical and geometrical requirements for statistical verification . 7
6.2.3 Non-statistical verification . 8
6.3 Hot rolled plates rolled on a reversing mill . 8
6.3.1 General. 8
6.3.2 Mechanical requirements for statistical verification for fixed thickness tolerance
classes according to EN 10029 and non-statistical verification for hot rolled plates
rolled on a reversing mill . 8
6.4 Sheets/plates cut from hot-rolled wide strip . 9
6.4.1 General. 9
6.4.2 Mechanical and geometrical requirements for statistical verification . 9
6.4.3 Non-statistical verification for sheets/plates cut from hot-rolled wide strip . 10
6.5 Hot finished and cold formed welded hollow sections . 10
7 Sampling and testing . 11
7.1 Location of samples and orientation of test pieces for mechanical tests . 11
7.2 Sampling period and population . 11
7.3 Tensile test . 11
Annex A (informative) Matrix of possible combinations of X and X criteria for sections
5 % 0,12 %
................................................................................................................................................................... 12
Bibliography . 14

European foreword
This document (CEN/TS 17991:2023) has been prepared by Technical Committee CEN/TC 459/SC 3
“Structural steels other than reinforcements”, the secretariat of which is held by DIN.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN/CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to announce this Technical Specification: 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 the
United Kingdom.
1 Scope
This document provides requirements for the statistical distribution of material properties and
dimensional parameters of structural steel products, allowing the proof of consistency of the safety
approach of the properties of the product standards compared to those of the design standards for the
design of steel buildings. It also describes the evaluation procedures for the verification of the compliance
of structural steels with these requirements.
This document applies for the following structural steel products intended for buildings: hot rolled and
welded I- and H-sections, hot rolled plates rolled on a reversing mill, sheets/plates cut from hot-rolled
wide strip and hot finished and cold formed welded structural hollow sections.
It is intended to be used as a background document to support the assessment of the partial factors for
steel constructions (as detailed in EN 1993-1-1).
This document can be used for neither product ordering nor certification.
NOTE The background of statistical requirements on mechanical properties and geometrical parameters is
detailed in EN 1993-1-1:2022, Annex E.
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 10024, Hot rolled taper flange I sections — Tolerances on shape and dimensions
EN 10029, Hot-rolled steel plates 3 mm thick or above — Tolerances on dimensions and shape
EN 10034, Structural steel I and H sections — Tolerances on shape and dimensions
EN 10025 (all parts), Hot rolled products of structural steels
EN 10051, Continuously hot-rolled strip and plate/sheet cut from wide strip of non-alloy and alloy steels —
Tolerances on dimensions and shape
EN 10149 (all parts), Hot rolled flat products made of high yield strength steels for cold forming
EN 10210 (all parts), Hot finished structural hollow sections of non-alloy and fine grain steels
EN 10219 (all parts), Cold formed welded structural hollow sections of non-alloy and fine grain steels
EN 10365, Hot rolled steel channels, I and H sections — Dimensions and masses
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— IEC Electropedia: available at https://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.1
partial factor
as according to EN 1990, the partial factors γ for buildings are: γ = resistance of cross-sections, γ =
Mi M0 M1
resistance of members to instability assessed by member checks and γ = resistance of cross-sections in
M2
tension to fracture; the values γ for buildings are given in EN 1993-1-1 unless the National Annex gives
Mi
different values
3.2
coefficient of variation
ratio of the standard deviation to the average value of data dispersion, v =σµ/
X XX
3.3
X and X fractiles
5 % 0,12 %
non-exceedance probabilities of 5 % and 0,12 % respectively of data dispersion
4 Statistical verification of partial factors for buildings - Requirements on the
statistical distribution of mechanical properties and products dimensions
4.1 General
The statistical requirements for the distribution of material properties and dimensional parameters are
on the basis for the calibration of the partial factors γ and γ used in EN 1993-1-1 for buildings. These
M0 M1
requirements are given in Tables 1 and 2 respectively. A parameter X from production (yield strength,
ultimate tensile strength, product thickness, etc.) may be assumed to be in line with the assumptions
made for the calibration of γ and γ for buildings used in EN 1993-1-1 if its data distribution meets
M0 M1
one of these two requirements:
— Option 1: the average value μ , match or exceed the corresponding values in Table 1 or Table 2, and
x
the coefficient of variation ν is equal to or lower than the values in these tables.
x
— Option 2: the X and X fractiles both match or exceed the corresponding reference values in
5 % 0,12 %
Table 1 or Table 2.
The values μ , ν , X and X for the production statistics may be determined by the procedures given
x x 5 % 0,12 %
in EN 1990:2023, Annex D. The definition of ν , X and X can be found in 3.1.
x 5 % 0,12 %
To show compliance with the assumptions, the production statistic should fulfil both the mechanical
properties and dimensional statistical criteria.
NOTE There is a need to treat the way requirements on mechanical properties and geometry can be
interrelated.
For each steel grade, the nominal values of yield strength and ultimate tensile strength shall be obtained
directly from the related product standards: the EN 10025 series for hot rolled products of structural
steels, the EN 10210 series for hot finished structural hollow sections, the EN 10219 series for cold
formed welded structural hollow sections and the EN 10149 series for hot-rolled flat products made of
high yield strength steels for cold forming. The characteristic dimensional parameter of Table 2 depends
on the geometry of the steel product. It shall be directly obtained from appropriate product dimensional
standards as EN 10024, EN 10034 and EN 10365 for hot rolled steel I and H sections, EN 10029 for hot
rolled steel plates, EN 10051 for sheets/plates from hot rolled wide strip, EN 10210-2 for hot finished
structural hollow sections and EN 10219-2 for cold formed welded structural hollow sections.
4.2 Practical procedure and permissible deviations
To assess the conformity of production data with the statistical requirements, it is more practical to use
Option 2, since an evaluation based on the tail of data dispersion is of higher im
...