ISO/TR 22762-7
(Main)Elastomeric seismic-protection isolators — Part 7: Relationship of the ISO 22762 series to the design and testing of seismic isolation systems
Elastomeric seismic-protection isolators — Part 7: Relationship of the ISO 22762 series to the design and testing of seismic isolation systems
Isolateurs en élastomère pour la protection sismique — Partie 7: Relation entre la série ISO 22762 et la conception et les essais des systèmes de protection sismique
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FINAL
TECHNICAL ISO/DTR
DRAFT
REPORT 22762-7
ISO/TC 45/SC 4
Elastomeric seismic-protection
Secretariat: DSM
isolators —
Voting begins on:
2023-09-04
Part 7:
Voting terminates on:
Relationship of the ISO 22762 series
2023-10-30
to the design and testing of seismic
isolation systems
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 SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/DTR 22762-7:2023(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS. © ISO 2023
ISO/DTR 22762-7:2023(E)
TECHNICAL ISO/TR
REPORT 22762-7
First edition
Elastomeric seismic-protection
isolators —
Part 7:
Relationship of the ISO 22762 series
to the design and testing of seismic
isolation systems
© ISO 2023
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
PROOF/ÉPREUVE
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Reference number
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 3
5 Structure of ISO 22762 from perspective of relationship with this document .4
6 Application of ISO 22762 to the testing and design requirements of elastomeric
isolators given in building codes .5
6.1 General . 5
6.2 Correspondence between seismic codes and ISO 22762: Key design terms and
definitions . 5
6.3 Correspondence between seismic codes and ISO 22762: Testing . 6
6.3.1 Qualification tests . 6
6.3.2 Prototype tests . 7
6.3.3 Production tests . 8
6.4 Determination of property modification factors . 8
6.5 Differences in property definitions between seismic codes and ISO 22762 . 9
Annex A (informative) Comparison table of requirement on isolators in ISO 22762-6 and
EN 15129 .10
Annex B (informative) Examples of test data by ISO 22762 corresponding to typical
prototype test specified in seismic codes .15
Annex C (informative) Examples of test data by ISO 22762 for determination of property
modification factors specified in seismic codes .34
Annex D (informative) An example of differences in measured value of properties for
HDR due to differences in definition formula of seismic code (ASCE/SEI 7-22) and
ISO 22762 .41
Bibliography .43
iii
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.
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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use
of (a) patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed
patent rights in respect thereof. As of the date of publication of this document, ISO had not received
notice of (a) patent(s) which may be required to implement this document. However, implementers are
cautioned that this may not represent the latest information, which may be obtained from the patent
database available at www.iso.org/patents. ISO shall not be held responsible for identifying any or all
such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 45, Rubber and rubber products,
Subcommittee SC 4, Products (other than hoses).
A list of all parts in the ISO 22762 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
PROOF/ÉPREUVE © ISO 2023 – All rights reserved
Introduction
Elastomeric isolators are one of the most popular types of seismic isolation systems for buildings
worldwide. Structural engineers must comply with national building code requirements, or guidelines
if detailed code provisions for isolation do not exist, and generally that means designing in accordance
with a standard, such as ASCE/SEI 7-22. In these codes and guidelines, the requirements for isolators
must satisfy design demands determined by structural seismic response analysis. The ISO 22762 series
provides detailed requirements for testing and design of elastomeric isolators and gives different
requirements (grades) according to the target performance level for the isolation system. This new
document is intended to explain the relationship between the requirements in national seismic codes
with ASCE/SEI 7-22 used by way of example throughout, and ISO 22762 series, with the goal of allowing
structural engineers to more effectively, and more widely, make use of ISO 22762 series when designing
seismically-isolated buildings. ASCE/SEI 7-22 is used throughout this document as an example building
code for seismically-isolated buildings, and any reference to “seismic code” may be understood to refer
to that document. The concept of this document is given in Figure 1.
Figure 1 — Conceptual diagram showing the role of ISO/TR 22762-7
v
TECHNICAL REPORT ISO/TR 22762-7:2023(E)
Elastomeric seismic-protection isolators —
Part 7:
Relationship of the ISO 22762 series to the design and
testing of seismic isolation systems
1 Scope
This document explains the relationship of the ISO 22762 series to the design and testing of seismic
isolation systems, including the relationship to national seismic codes.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions 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
breaking
rupture of elastomeric isolator (3.6) due to compression- (or tension-) shear loading
3.2
buckling
state when elastomeric isolators (3.6) lose their stability under compression-shear loading
3.3
compressive properties of elastomeric isolator
K
v
compressive stiffness for all types of rubber bearings
3.4
design compressive stress
long-term compressive force on the elastomeric isolator (3.6) imposed by the structure
3.5
design shear strain
shear strain of elastomeric isolator at design shear displacement
3.6
elastomeric isolator
rubber bearing, for seismic isolation of buildings, bridges and other structures, which consists of multi-
layered vulcanized rubber sheets and reinforcing steel plates
EXAMPLE High-damping rubber bearings, linear natural rubber bearings and lead rubber bearings.
3.7
first shape factor
ratio of effectively loaded area to free deformation area of one inner rubber layer between steel plates
3.8
high-damping rubber bearing
HDR
elastomeric isolator with relatively high damping properties obtained by special compounding of the
rubber and the use of additives
3.9
inner rubber
rubber between multi-layered steel plates inside an elastomeric isolator (3.6)
3.10
lead rubber bearing
LRB
elastomeric isolator (3.6) whose inner rubber (3.8) with a lead plug or lead plugs press fitted into a hole
or holes of the isolator body to achieve damping properties
3.11
linear natural rubber bearing
LNR
elastomeric isolator (3.6) with linear shear force-deflection characteristics and relatively low damping
properties, fabricated using natural rubber
Note 1 to entry: Any bearing with relatively low damping can be treated as an LNR bearing for the purposes of
isolator testing.
3.12
maximum compressive stress
peak stress acting briefly on elastomeric isolators (3.6) in compressive direction during an earthquake
3.13
maximum shear strain
shear strain of elastomeric isolator at maximum shear displacement
3.14
property modification factor
factor to account for a variation in physical property from a standard value, due to effects such as
temperature, rate of loading, manufacturing variations, ageing and environmental exposure
3.15
compressive stress
nominal compressive stress
long-term stress acting on elastomeric isolators (3.6) in compressive direction as recommended by the
manufacturer for the isolator, including the safety margin
3.16
production test
project specific test to verify that the isolator manufactured has the required performance prior to
shipping
3.17
prototype test
project specific test to verify that the designed isolator has the required performance
3.18
qualification test
test to demonstrate the isolator performance in various test items, which is conducted by manufacturer
and whose data is submitted for approval of structural engineer as one of bidding documents
PROOF/ÉPREUVE © ISO 2023 – All rights reserved
3.19
routine test
test for quality control of the production isolators during and after manufacturing
3.20
second shape factor
ratio of the diameter of the inner rubber (3.8) to the total thickness of
...
Style Definition
ISO/DTR PRF TR 22762-7(E) .
Formatted: English (United Kingdom)
ISO /TC 45/SC 4/WG 9
Formatted
...
Formatted: zzCover large, Left, Space After: 0 pt, Tab stops:
Secretariat: DSM
Not at 0.7 cm + 1.4 cm + 2.1 cm + 2.8 cm + 3.5 cm + 4.2
cm + 4.9 cm + 5.6 cm + 6.3 cm + 7 cm
Date: 2023-06-2308-18
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at 0.7 cm + 1.4 cm + 2.1 cm + 2.8 cm + 3.5 cm + 4.2 cm
+ 4.9 cm + 5.6 cm + 6.3 cm + 7 cm
Elastomeric seismic-protection isolators —
— Part 7: Formatted
...
Relationship of the ISO 22762 series to the design and testing
Formatted: Cover Title_A2, Left, Space After: 0 pt, Tab
of seismic isolation systems
stops: Not at 0.7 cm + 1.4 cm + 2.1 cm + 2.8 cm + 3.5 cm
+ 4.2 cm + 4.9 cm + 5.6 cm + 6.3 cm + 7 cm
FDIS stage
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publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical,
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including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can
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be requested from either ISO at the address below or ISO'sISO’s member body in the country of the requester.
ISO copyright office Formatted: zzCopyright address
Case postale 56 • CP 401 • Ch. de Blandonnet 8
CH-12111214 Vernier, Geneva 20
Formatted: zzCopyright address
Tel.Phone: + 41 22 749 01 11
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Fax + 41 22 749 09 47
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iii
ISO/DTRPRF TR 22762-7:2023(:(E) Formatted: Font: Bold
Formatted: Font: Bold
Formatted: Header
Contents Formatted: Font: Bold
Foreword . iv
Introduction . viii
1 Scope . 10
2 Normative references . 10
3 Terms and definitions . 10
4 Symbols . 13
5 Structure of ISO 22762 from perspective of relationship with this document . 14
6 Application of ISO 22762 to the testing and design requirements of elastomeric isolators given in
building codes . 15
6.1 General . 15
6.2 Correspondence between seismic codes and ISO 22762: Key design terms and definitions . 15
6.3 Correspondence between seismic codes and ISO 22762: Testing . 16
6.3.1 Qualification tests . 16
6.3.2 Prototype tests . 17
6.3.3 Production tests . 19
6.4 Determination of property modification factors . 20
6.5 Differences in property definitions between seismic codes and ISO 22762 . 21
Annex A (informative) Comparison table of requirement on isolators in ISO 22762-6 and EN 15129. 23
Annex B (informative) Examples of test data by ISO 22762 corresponding to typical prototype test
specified in seismic codes . 8
Annex C (informative) Examples of test data by ISO 22762 for determination of property modification
factors specified in seismic codes . 38
Annex D (informative) An example of differences in measured value of properties for HDR due to
differences in definition formula of seismic code (ASCE/SEI 7-22) and ISO 22762 . 49
Bibliography . 52
Foreword v
Introduction vi
Figure 1 — Conceptual diagram showing the role of ISO 22762 - Part 7 vi
1 Scope 7
2 Normative references 7
3 Terms and definitions 7
4 Symbols 9
Table 1 — Symbols and descriptions 9
5 Structure of ISO 22762 from perspective of relationship with Part 7 11
Formatted: Font: 11 pt
iv
iv © ISO 2023 – All rights
reserved
ISO/DTRPRF TR 22762-7:2023(:(E) Formatted: Font: Bold
Formatted: Header
Formatted: Font: Bold
Figure 2 ― Relationship of Part 7 and other parts of ISO 22762 11
Formatted: Font: Bold
6 Application of ISO 22762 to the testing and design requirements of elastomeric isolators given in
building codes 11
6.1 General 11
6.2 Correspondence between seismic codes and ISO 22762: key terms and definitions 11
Table 2 ― Correspondence between seismic codes and ISO 22762: key terms and definitions 11
6.3 Correspondence between seismic codes and ISO 22762: testing 12
Table 3 — ISO 22762 provisions for qualification tests of elastomeric isolators 13
6.4 Determination of property modification factors 15
6.5 Differences in property definitions between seismic codes and ISO 22762 16
Annex A (informative) Comparison table of requirement on isolators in ISO 22762 Part 6 and EN 15129
A.1 General 17
Annex B (informative) Examples of test data by ISO 22762 corresponding to typical prototype test
specified in seismic codes 21
B.1 General 21
B.2 Shear strain dependency 21
B.3 Repeated loading dependency 25
B.4 Shear strain and displacement capacity 27
B.5 Tensile capacity 30
Annex C (informative) Examples of test data by ISO 22762 for determination of property modification
factors specified in seismic codes 32
C.1 General 32
C.2 Ageing 32
C.3 Temperature dependency 34
C.4 All cyclic effects 37
Annex D (informative) An example of differences in measured value of properties for HDR due to
differences in definition formula of seismic code (ASCE/SEI 7-22) and ISO 22762 38
D.1 General 38
D.2 Test specimens and test conditions 38
D.3 Test results 38
Formatted: Font: 11 pt
Formatted: Left
v
ISO/DTRPRF TR 22762-7:2023(:(E) Formatted: Font: Bold
Formatted: Font: Bold
Formatted: Header
Foreword
Formatted: Font: Bold
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.
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 documentsdocument 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). Field Code Changed
Attention is drawnISO draws attention to the possibility that some of the elementsimplementation of this
document may beinvolve the subjectuse of (a) patent(s). ISO takes no position concerning the evidence,
validity or applicability of any claimed patent rights. in respect thereof. As of the date of publication of
this document, ISO had not received notice of (a) patent(s) which may be required to implement this
document. However, implementers are cautioned that this may not represent the latest information,
which may be obtained from the patent database available at www.iso.org/patents. ISO shall not be held
responsible for identifying any or all such patent rights. Details of any patent rights identified during the
development of the document will be in the Introduction and/or on the ISO list of patent declarations
received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the World
Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT)), see
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 45, Rubber and rubber products,
Subcommittee SC 4, Products (other than hoses).
A list of all parts in the ISO 22762 series can be found on the ISO website.
ISO 22762 consists of the following parts, under the general title Elastomeric seismic-protection isolators
—:
— Part 1: Test methods
— Part 2: Applications for bridges — Specifications
— Part 3: Applications for buildings — Specifications
— Part 4: Guidance on the application of ISO 22762-3
— Part 5: Sliding seismic-protection isolators for buildings
Formatted: Font: 11 pt
vi
vi © ISO 2023 – All rights
reserved
ISO/DTRPRF TR 22762-7:2023(:(E) Formatted: Font: Bold
Formatted: Header
Formatted: Font: Bold
— Part 6: High-durability and high-performance specifications and test methods
Formatted: Font: Bold
— Part 7: Relationship of the ISO 22762 series to the design and testing of seismic isolation systems
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.htmlwww.iso.org/members.html.
Formatted: Font: 11 pt
Formatted: Left
vii
ISO/DTRPRF TR 22762-7:2023(:(E) Formatted: Font: Bold
Formatted: Font: Bold
Formatted: Header
Introduction Formatted: Font: Bold
Elastomeric isolators are one of the most popular types of seismic isolation systems for buildings
worldwide. Structural engineers must comply with national building code requirements, or guidelines if
detailed code provisions for isolation do not exist, and generally that means designing in accordance with
a standard, such as ASCE/SEI 7-22. In these codes and guidelines, the requirements for isolators must
satisfy design demands determined by structural seismic response analysis. The ISO 22762 series
provideprovides detailed requirements for testing and design of elastomeric isolators and gives different
requirements (grades) according to the target performance level for the isolation system. This new
document is intended to explain the relationship between the requirements in national seismic codes
with ASCE/SEI 7-22 used by way of example throughout, and ISO 22762 series, with the goal of allowing
structural engineers to more effectively, and more widely, make use of ISO 22762 series when designing
seismically-isolated buildings. ASCE/SEI 7-22 is used throughout Part 7this document as an example
building code for seismically-isolated buildings, and any reference to “seismic code” may be understood
to refer to that document. The concept of the ISO 22762 -Part7this document is given in Figure 1.Figure 1.
Formatted: Font: 11 pt
viii
viii © ISO 2023 –
...
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