ISO/TR 22762-7:2024
(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
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.
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
General Information
Standards Content (Sample)
Technical
Report
ISO/TR 22762-7
First edition
Elastomeric seismic-protection
2024-07
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
Reference number
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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 .6
6.3.3 Production tests .7
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 requirements for isolators in ISO 22762-6 and EN
15129 .10
Annex B (informative) Examples of test data by ISO 22762 corresponding to typical prototype
tests specified in seismic codes . 14
Annex C (informative) Examples of test data by ISO 22762 for determination of property
modification factors specified in seismic codes .32
Annex D (informative) An example of differences in measured value of properties for HDR due
to differences in definition formulae of seismic code (ASCE/SEI 7-22) and ISO 22762.39
Bibliography .40
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
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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).
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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
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 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 22762-7:2024(en)
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 (3.6) 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 (3.6) 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 (3.9) has 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 (3.6) 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
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 (3.9) to the total thickness of the
inner rubber
3.21
second shape factor
ratio of the effective width of the inner rubber (3.9) to the total
thickness of the inner rubber
3.22
seismic code
building code that defines regulatory requirements for the earthquake design of buildings, and which may
include provisions for seismic isolation
3.23
shear properties
shear properties of elastomeric isolators
comprehensive term that covers characteristics determined from isolator tests:
— shear stiffness, K , for LNR
h
— shear stiffness, K , and equivalent damping ratio, h , for HDR and
...
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