1、BRITISH STANDARD BS ISO 22762-2:2005 Incorporating Technical Corrigendum No. 1 Elastomeric seismic-protection isolators Part 2: Applications for bridges Specifications ICS 83.140.99; 93.040 BS ISO 22762-2:2005 This British Standard was published under the authority of the Standards Policy and Strate
2、gy Committee on 27 January 2006 BSI 2006 ISBN 0 580 47753 3 National foreword This British Standard reproduces verbatim ISO 22762-2:2005, including Technical Corrigendum July 2006, and implements it as the UK national standard. The UK participation in its preparation was entrusted to Technical Commi
3、ttee PRI/73, Industrial rubber products, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may be found in
4、the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsibl
5、e for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK int
6、erests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii to vi, pages 1 to 57 and a back cover. The BSI copyright notice displayed in this docume
7、nt indicates when the document was last issued. Amendments issued since publication Amd. No. Date Comments 16667 Corrigendum No. 1 31 October 2006 Corrections to Table 7, 7.9.1, item b) and Annex G, equation (G.5) Reference number ISO 22762-2:2005(E)INTERNATIONAL STANDARD ISO 22762-2 First edition 2
8、005-07-15 Elastomeric seismic-protection isolators Part 2: Applications for bridges Specifications Appareils dappuis structuraux en lastomre pour protection sismique Partie 2: Applications pour ponts Spcifications BS ISO 22762-2:2005ii BS ISO 22762-2:2005 iii Contents Page Foreword. v Introduction .
9、 vi 1 Scope . 1 2 Normative references . 1 3 Terms and definitions. 1 4 Symbols and abbreviated terms . 4 5 Classification. 8 5.1 General. 8 5.2 Classification by construction 8 5.3 Classification by ultimate properties 9 5.4 Classification by tolerance on shear stiffness 9 6 Requirements 9 6.1 Gene
10、ral. 9 6.2 Type tests and routine tests 10 6.3 Functional requirements 10 6.4 Design compressive force and design shear displacement 11 6.5 Product performance requirements 11 6.6 Rubber material requirements. 17 6.7 Dimensional requirements. 19 6.8 Requirements on steel used for flanges and reinfor
11、cing plates . 19 7 Design rules 19 7.1 General rules . 19 7.2 Shape factor 21 7.3 Compressive and shear properties. 22 7.4 Shear strain due to horizontal displacements. 22 7.5 Total local shear strain. 23 7.6 Tensile stress on reinforcing steel plates 23 7.7 Stability 24 7.8 Force, moment and deform
12、ation affecting structures 25 7.9 Design of fixings . 26 8 Manufacturing tolerances 27 8.1 General. 27 8.2 Measuring instruments 27 8.3 Plan dimensions of isolator body . 27 8.4 Product height. 28 8.5 Flatness of products. 31 8.6 Horizontal offset 31 8.7 Plan dimensions of flanges . 32 8.8 Flange th
13、ickness. 32 8.9 Tolerances on positions of flange bolt holes 33 9 Marking and labelling . 33 9.1 General. 33 9.2 Information to be provided 33 9.3 Additional requirements 34 9.4 Marking and labelling examples 34 10 Test methods. 34 11 Quality assurance . 34 BS ISO 22762-2:2005 iv Annex A (normative)
14、 Tensile stress in reinforcing steel plate 35 Annex B (normative) Buckling stability . 37 Annex C (normative) Allowable tensile stress in isolator 38 Annex D (informative) Confirmation list . 39 Annex E (informative) Dependency of ultimate properties on shape factor 41 Annex F (informative) Minimum
15、recommended properties of elastomers . 44 Annex G (informative) Compressive stiffness. 45 Annex H (informative) Determination of shear properties of elastomeric isolators 48 Annex I (informative) Determination of local shear strain due to compression 53 Annex J (informative) Maximum compressive stre
16、ss. 56 Bibliography . 57 v 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
17、 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 Comm
18、ission (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 technic
19、al 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 sha
20、ll not be held responsible for identifying any or all such patent rights. ISO 22762-2 was prepared by Technical Committee ISO/TC 45, Rubber and rubber products, Subcommittee SC 4, Products (other than hoses). ISO 22762 consists of the following parts, under the general title Elastomeric seismic-prot
21、ection isolators: Part 1: Test methods Part 2: Applications for bridges Specifications Part 3: Applications for buildings Specifications BS ISO 22762-2:2005vi Introduction This International Standard contains two parts related to specifications for isolators one for bridges and the other for buildin
22、gs since the requirements for isolators for bridges and for buildings are quite different, although the basic concept of the two products is similar. Therefore, when this International Standard is applied to the design of bridge isolators, Part 2 and the relevant clauses in Part 1 are used and, when
23、 it is applied to building isolators, Part 3 and the relevant clauses in Part 1 are used. The main differences to be noted between isolators for bridges and isolators for buildings are as below: a) Isolators for bridges are mainly rectangular in shape and those for buildings circular in shape. b) Is
24、olators for bridges are designed to be used for both rotation and horizontal displacement, while isolators for buildings are designed for horizontal displacement only. c) Isolators for bridges are designed to perform on a daily basis to accommodate length changes of bridges caused by temperature cha
25、nges as well as during earthquakes, while isolators for buildings are designed to perform only during earthquakes. d) Isolators for bridges are designed to withstand dynamic loads caused by vehicles on a daily basis as well as earthquakes, while isolators for buildings are mainly designed to withsta
26、nd dynamic loads caused by earthquakes only. For structures that are neither buildings nor bridges (e.g. tanks), the structural engineer may use either Part 2 or Part 3 of this International Standard, depending on the requirements of the structure. BS ISO 22762-2:20051Elastomeric seismic-protection
27、isolators Part 2: Applications for bridges Specifications 1 Scope ISO 22762 applies to elastomeric seismic isolators used to provide buildings or bridges with protection from earthquake damage. The isolators covered consist of alternate elastomer layers and reinforcing steel plates. They are placed
28、between a superstructure and its substructure to provide both flexibility for decoupling structural systems from ground motion, and damping capability to reduce displacement at the isolation interface and the transmission of energy from the ground into the structure at the isolation frequency. This
29、part of ISO 22762 specifies the requirements for elastomeric seismic isolators used for bridges and the requirements for the rubber material used in the manufacture of such isolators. The specification covers requirements, design rules, manufacturing tolerances, marking and labelling and test method
30、s for elastomeric isolators. Some items of classification and some requirements need to be confirmed before production and these should be reviewed using the list given in Annex D. 2 Normative references The following referenced documents are indispensable for the application of this document. For d
31、ated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 630, Structural steels Plates, wide flats, bars, sections and profiles ISO 1052, Steels for general engineering purposes ISO 1629, Rubber and
32、 latices Nomenclature ISO 3302-1, Rubber Tolerances for products Part 1: Dimensional tolerances ISO 22762-1:2005, Elastomeric seismic-protection isolators Part 1: Test methods 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 breaking rupture o
33、f elastomeric isolator due to compression (or tension)-shear loading BS ISO 22762-2:20052 3.2 buckling state when elastomeric isolators lose their stability under compressive-shear loading 3.3 compressive properties of elastomeric isolator compressive stiffness ( v K ) for all types of rubber bearin
34、gs 3.4 compressive-shear testing machine machine used to test elastomeric isolators, which has the capability of shear loading under constant compressive load 3.5 cover rubber rubber wrapped around the outside of inner rubber and reinforcing steel plates before or after curing of elastomeric isolato
35、rs for the purpose of protecting the inner rubber from deterioration due to oxygen, ultraviolet rays and other natural elements and protecting the reinforcing plates from corrosion 3.6 design compressive stress long-term compressive force on the elastomeric isolator imposed by the structure 3.7 effe
36、ctive loaded area area sustaining vertical load in elastomeric isolators, which corresponds to the area of reinforcing steel plates 3.8 effective width rectangular elastomeric isolator the smaller of the two side lengths of inner rubber to which direction shear displacement is not restricted 3.9 ela
37、stomeric isolator rubber bearing, for seismic isolation of buildings, bridges and other structures, which consists of multi-layered vulcanized rubber sheets and reinforcing steel plates NOTE Types of such isolators include high-damping rubber bearings, linear natural rubber bearings and lead rubber
38、bearings. 3.10 first shape factor ratio of effectively loaded area to free deformation area of one inner rubber layer between steel plates 3.11 high-damping rubber bearing HDR elastomeric isolator with relatively high-damping properties obtained by special compounding of the rubber and the use of ad
39、ditives 3.12 inner rubber rubber between multi-layered steel plates inside an elastomeric isolator 3.13 lead rubber bearing LRB elastomeric isolator whose inner rubber with a lead plug or lead plugs press fitted into a hole or holes of the isolator body to achieve damping properties BS ISO 22762-2:2
40、0053 3.14 linear natural rubber bearing LNR elastomeric isolator with linear shear force-deflection characteristics and relatively low-damping properties and fabricated using natural rubber NOTE Any bearing with relatively low damping may be treated as an LNR bearing for the purposes of isolator tes
41、ting. 3.15 maximum compressive stress maximum compressive stress acting briefly on elastomeric isolators during an earthquake 3.16 nominal compressive stress long-term compressive stress recommended by the manufacturer for the isolator, including the safety margin 3.17 roll-out instability of an iso
42、lator with either dowelled or recessed connection under shear displacement 3.18 routine test a test for quality control of the production isolators during and after manufacturing 3.19 second shape factor circular elastomeric isolator ratio of the diameter of the inner rubber to the total thickness o
43、f the inner rubber rectangular or square elastomeric isolator ratio of the effective width of the inner rubber to the total thickness of the inner rubber 3.20 shear properties of elastomeric isolators a comprehensive term that covers characteristics determined from isolator tests: shear stiffness (
44、h K ) for LNR; shear stiffness ( h K ) and equivalent damping ratio ( eq h ) for HDR and LRB; post-yield stiffness ( d K ) and characteristic strength ( d Q ) for LRB. 3.21 structural engineer engineer who is in charge of designing of structure for base-isolated bridges or buildings and is responsib
45、le for specifying the requirements for elastomeric isolators 3.22 type test test for verification either of material properties and isolator performances during development of the product or that project design parameters are achieved 3.23 ultimate properties properties at either buckling, breaking,
46、 or roll-out of an isolator under compressive-shear loading 3.24 ultimate property diagram UPD diagram giving the interaction curve of compressive stress and buckling strain or breaking strain of an elastomeric isolator BS ISO 22762-2:20054 4 Symbols and abbreviated terms For the purposes of all thr
47、ee parts of ISO 22762, the symbols given in Table 1 apply. Table 1 Symbols and definitions Symbol Definition A effective plan area; plan area of elastomeric isolator excluding cover rubber portion b A effective area of bolt e A overlap area between the top and bottom elastomer area of isolator shear
48、ed under non-seismic displacement free A load-free area of isolator load A loaded area of isolator p A area of the lead plug for a lead rubber bearing a side length of square elastomeric isolator excluding cover rubber thickness, or length in longitudinal direction of rectangular isolator excluding
49、cover rubber thickness e alength of the shorter side of the rectangular isolator including cover rubber thickness a length in longitudinal direction of the rectangular isolator, including cover rubber thickness B effective width for bending of flange b length in transverse direction of the rectangular isolator, excluding cover rubber thickness b length in transverse direction of the rectangular isolator, including cover rubber thickness
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