1、 Reference number ISO 22762-2:2010(E) ISO 2010INTERNATIONAL STANDARD ISO 22762-2 Second edition 2010-11-01 Elastomeric seismic-protection isolators Part 2: Applications for bridges Specifications Appareils dappuis structuraux en lastomre pour protection sismique Partie 2: Applications pour ponts Spc
2、ifications ISO 22762-2:2010(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the edit
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5、the address given below. COPYRIGHT PROTECTED DOCUMENT ISO 2010 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from ei
6、ther ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2010 All rights reservedISO 22762-2:2010(E) I
7、SO 2010 All rights reserved iiiContents Page Foreword iv Introduction.v 1 Scope1 2 Normative references1 3 Terms and definitions .1 4 Symbols4 5 Classification .7 6 Requirements.8 7 Design rules .17 8 Manufacturing tolerances.25 9 Marking and labelling32 10 Test methods .33 11 Quality assurance33 An
8、nex A (normative) Tensile stress in reinforcing steel plate.34 Annex B (normative) Buckling stability36 Annex C (normative) Allowable tensile stress in isolator 37 Annex D (informative) Dependency of ultimate properties on shape factor 38 Annex E (informative) Minimum recommended tensile properties
9、for rubber materials 41 Annex F (informative) Compressive stiffness42 Annex G (informative) Determination of shear properties of elastomeric isolators46 Annex H (informative) Determination of local shear strain due to compression.51 Annex I (informative) Maximum compressive stress 54 Bibliography55
10、ISO 22762-2:2010(E) iv ISO 2010 All rights reservedForeword 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. Eac
11、h 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 Internation
12、al 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 Standard
13、s 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 o
14、f patent rights. ISO shall 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). This second edition cancels and replaces the first edition (ISO 227
15、62-2:2005), which has been technically revised. It also incorporates the Technical Corrigendum ISO 22762-2:2005/Cor.1:2006. ISO 22762 consists of the following parts, under the general title Elastomeric seismic-protection isolators: Part 1: Test methods Part 2: Applications for bridges Specification
16、s Part 3: Applications for buildings Specifications ISO 22762-2:2010(E) ISO 2010 All rights reserved vIntroduction ISO 22762 (all parts) consists of two parts related to specifications for isolators, i.e. ISO 22762-1 for bridges and ISO 22762-2 for buildings. This is because the isolator requirement
17、s for bridges and buildings are quite different, although the basic concept of the two products is similar. Therefore, ISO 22762-2 and the relevant clauses in ISO 22762-1 are used when ISO 22762 (all parts) is applied to the design of bridge isolators whereas ISO 22762-3 and the relevant clauses of
18、ISO 22762-1 are used when it is applied to building isolators. The main differences to be noted between isolators for bridges and isolators for buildings are the following. a) Isolators for bridges are mainly rectangular in shape and those for buildings are circular in shape. b) Isolators for bridge
19、s 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 changes as well as du
20、ring 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 withstand dynamic loads c
21、aused by earthquakes only. For structures other than buildings and bridges (e.g. tanks), the structural engineer uses either ISO 22762-2 or ISO 22762-3, depending on the requirements of the structure. INTERNATIONAL STANDARD ISO 22762-2:2010(E) ISO 2010 All rights reserved 1Elastomeric seismic-protec
22、tion isolators Part 2: Applications for bridges Specifications 1 Scope This part of ISO 22762 specifies minimum requirements and test methods for elastomeric seismic isolators used for bridges, as well as rubber material used in the manufacture of such isolators. It is applicable to elastomeric seis
23、mic isolators used to provide bridges with protection from earthquake damage. The isolators covered consist of alternate elastomeric layers and reinforcing steel plates, which are placed between a superstructure and its substructure to provide both flexibility for decoupling structural systems from
24、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. 2 Normative references The following referenced documents are indispensable for the application of this document. For d
25、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 22762-1:2010, El
26、astomeric 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 of elastomeric isolator due to compression (or tension)-shear loading 3.2 buckling state when elastomeric isolators l
27、ose their stability under compression-shear loading 3.3 compressive properties of elastomeric isolator K vcompressive stiffness for all types of rubber bearings ISO 22762-2:2010(E) 2 ISO 2010 All rights reserved3.4 compression-shear testing machine machine used to test elastomeric isolators, which h
28、as 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 isolators for the purposes of protecting the inner rubber from deterioration due to oxygen, ozone a
29、nd 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 effective loaded area area sustaining vertical load in elastomeric isolators, which corresponds to the are
30、a 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 elastomeric isolator rubber bearing, for seismic isolation of buildings, bridges and other structures, wh
31、ich consists of multi-layered vulcanized rubber sheets and reinforcing steel plates EXAMPLE High-damping rubber bearings, linear natural rubber bearings and lead rubber bearings. 3.10 first shape factor ratio of effectively loaded area to free deformation area of one inner rubber layer between steel
32、 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 additives 3.12 inner rubber rubber between multi-layered steel plates inside an elastomeric isolator 3.13 lead rubber bearing LRB ela
33、stomeric 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 3.14 linear natural rubber bearing LNR elastomeric isolator with linear shear force-deflection characteristics and relatively low damping propertie
34、s, fabricated using natural rubber NOTE Any bearing with relatively low damping can be treated as an LNR bearing for the purposes of isolator testing. ISO 22762-2:2010(E) ISO 2010 All rights reserved 33.15 maximum compressive stress peak stress acting briefly on elastomeric isolators in compressive
35、direction during an earthquake 3.16 nominal compressive stress long-term stress acting on elastomeric isolators in compressive direction as recommended by the manufacturer for the isolator, including the safety margin 3.17 roll-out instability of an isolator with either dowelled or recessed connecti
36、on under shear displacement 3.18 routine test 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 of the inner rubber 3.20 second shape factor recta
37、ngular or square elastomeric isolator ratio of the effective width of the inner rubber to the total thickness of the inner rubber 3.21 shear properties of elastomeric isolators comprehensive term that covers characteristics determined from isolator tests: shear stiffness, K h , for LNR; shear stiffn
38、ess, K h , and equivalent damping ratio, h eq , for HDR and LRB; post-yield stiffness, K d , and characteristic strength, Q d , for LRB 3.22 structural engineer engineer who is in charge of designing the structure for base-isolated bridges or buildings and is responsible for specifying the requireme
39、nts for elastomeric isolators 3.23 type test test for verification either of material properties and isolator performances during development of the product or that project design parameters are achieved 3.24 ultimate properties properties at either buckling, breaking, or roll-out of an isolator und
40、er compression-shear loading 3.25 ultimate property diagram UPD diagram giving the interaction curve of compressive stress and buckling strain or breaking strain of an elastomeric isolator ISO 22762-2:2010(E) 4 ISO 2010 All rights reserved4 Symbols For the purposes of this document, the symbols give
41、n in Table 1 apply. Table 1 Symbols and descriptions Symbol Description A effective plan area; plan area of elastomeric isolator, excluding cover rubber portion A beffective area of bolt A eoverlap area between the top and bottom elastomer area of isolator A freeload-free area of isolator A loadload
42、ed area of isolator A parea 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 cover rubber thickness a elength of the shorter side of the rectangular isolat
43、or, 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 directio
44、n of the rectangular isolator, including cover rubber thickness c distance from centre of bolt hole to effective flange section D outer diameter of circular isolator, including cover rubber D fdiameter of flange d iinner diameter of reinforcing steel plate d kdiameter of bolt hole d 0outer diameter
45、of reinforcing steel plate E apapparent Youngs modulus of bonded rubber layer E capparent Youngs modulus corrected, if necessary, by allowing for compressibility E c sapparent Youngs modulus corrected for bulk compressibility depending on its shape factor (S 1 ) E bulk modulus of rubber E 0Youngs mo
46、dulus of rubber F utensile force on isolator by uplift G shear modulus G eq ( ) equivalent linear shear modulus at shear strain H height of elastomeric isolator, including mounting flange H nheight of elastomeric isolator, excluding mounting flange h eqequivalent damping ratio h eq ( ) equivalent da
47、mping ratio as a function of shear strain K dpost-yield stiffness (tangential stiffness after yielding of lead plug) of lead rubber bearing K hshear stiffness K iinitial shear stiffness K pshear stiffness of lead plug inserted in lead rubber bearing ISO 22762-2:2010(E) ISO 2010 All rights reserved 5
48、Table 1 (continued) Symbol Description K rshear stiffness of lead rubber bearing before inserting lead plug K ttangential shear stiffness K vcompressive stiffness L flength of one side of a rectangular flange M resistance to rotation M fmoment acting on bolt M rmoment acting on isolator n number of
49、rubber layers n bnumber of fixing bolts P compressive force P 0design compressive force P maxmaximum compressive force P minminimum compressive force Q shear force Q bshear force at break Q bukshear force at buckling Q dcharacteristic strength S 1first shape factor S 2second shape factor T temperature T 0standard temperature, 23 C or 27 C; where specified tolerance is 2 C, T 0is standard laboratory temperature T rtotal rubber thickness, given by T r= n t rt rthickness of one rubber lay
