ISO 13822:2010

INTERNATIONAL ISO
STANDARD 13822
Second edition
2010-08-01
Bases for design of structures —
Assessment of existing structures
Bases du calcul des constructions — Évaluation des constructions
existantes
Reference number
©
ISO 2010
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ii © ISO 2010 – All rights reserved

Contents Page
Foreword .v
Introduction.vi
1 Scope.1
2 Normative references.1
3 Terms and definitions .2
4 General framework of assessment.3
4.1 Objectives .3
4.2 Procedure.4
4.3 Specification of the assessment objectives.5
4.4 Scenario.5
4.5 Preliminary assessment .5
4.6 Detailed assessment.6
4.7 Results of assessment.7
5 Data for assessment .7
5.1 General .7
5.2 Actions and environmental influences .7
5.3 Material properties .8
5.4 Properties of the structure .8
5.5 Dimensions .8
6 Structural analysis .9
6.1 Models .9
6.2 Limit states.9
6.3 Basic variables .9
6.4 Model uncertainties.9
6.5 Conversion factors.9
6.6 Uncertainty about the condition of components .9
6.7 Deterioration models.9
7 Verification .10
7.1 Bases .10
7.2 Reliability assessment.10
7.3 Limit states.10
7.4 Plausibility check .10
7.5 Target reliability level.10
8 Assessment based on satisfactory past performance.10
8.1 Assessment of safety.10
8.2 Assessment of serviceability .11
9 Interventions .11
10 Report .11
10.1 General .11
10.2 Conclusions .11
10.3 Sufficient reliability .11
10.4 Insufficient reliability.12
10.5 Recommendations for interventions.12
10.6 Inspection and maintenance plan.12
10.7 Documented information.12
10.8 Reporting style .12
11 Judgement and decision.12
11.1 Decision .12
Annex A (informative) Hierarchy of terms .13
Annex B (informative) Flowchart for the general assessment of existing structures .14
Annex C (informative) Updating of measured quantities.15
Annex D (informative) Testing for static and dynamic properties of structures .21
Annex E (informative) Assessment of time-dependent reliability.24
Annex F (informative) Target reliability level.28
Annex G (informative) Test report format.30
Annex H (informative) Design of upgrading .33
Annex I (informative) Heritage structures.35
Bibliography .44

iv © ISO 2010 – All rights reserved

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 committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 13822 was prepared by Technical Committee ISO/TC 98, Bases for design of structures, Subcommittee
SC 2, Reliability of structures.
This second edition cancels and replaces the first edition (ISO 13822:2001), which has been technically
revised, including the addition of a new Annex I, the associated change to the Foreword and with some minor
editorial changes.
Introduction
The continued use of existing structures is of great importance because the built environment is a huge
economic and political asset, growing larger every year. The assessment of existing structures is now a major
engineering task. The structural engineer is increasingly called upon to devise ways for extending the life of
structures whilst observing tight cost constraints. The establishment of principles for the assessment of
existing structures is required because it is based on an approach that is substantially different from design of
new structures and requires knowledge beyond the scope of design codes. This document is intended not
only as a statement of principals and procedures for the assessment of existing structures but also as a guide
for use by structural engineers and clients. Engineers can apply specific methods for assessment in order to
save structures and to reduce a client's expenditure. The ultimate goal is to limit construction intervention to a
strict minimum, a goal that is clearly in agreement with the principles of sustainable development.
The basis for the reliability assessment is contained in the performance requirements for safety and
serviceability of ISO 2394. Economic, social and sustainability considerations, however, result in a greater
differentiation in structural reliability for the assessment of existing structures than for the design of new
structures.
vi © ISO 2010 – All rights reserved

INTERNATIONAL STANDARD ISO 13822:2010(E)

Bases for design of structures — Assessment of existing
structures
1 Scope
This International Standard provides general requirements and procedures for the assessment of existing
structures (buildings, bridges, industrial structures, etc.) based on the principles of structural reliability and
consequences of failure. It is based on ISO 2394.
It is applicable to the assessment of any type of existing structure that was originally designed, analysed and
specified based on accepted engineering principles and/or design rules, as well as structures constructed on
the basis of good workmanship, historic experience and accepted professional practice. The assessment can
be initiated under the following circumstances:
⎯ an anticipated change in us
...