1、 ISO 2015 Seismic assessment and retrofit of concrete structures valuation sismique et rhabilitation de structures en bton INTERNATIONAL STANDARD ISO 16711 First edition 2015-05-01 Reference number ISO 16711:2015(E) ISO 16711:2015(E)ii ISO 2015 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 20
2、15, Published in Switzerland All rights reserved. Unless otherwise specified, 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
3、. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Ch. de Blandonnet 8 CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyrightiso.org www.iso.org ISO 16711:2015(E)Forewo
4、rd iv Introduction v 1 Scope . 1 2 Normative references 1 3 Terms and definitions . 1 4 Framework of Assessment and Retrofit . 3 5 Preliminary assessment . 5 5.1 General . 5 5.2 Investigation items 6 5.3 Judgment 6 6 Detailed seismic assessment . 7 6.1 General . 7 6.2 Detailed investigation . 7 6.3
5、Analysis 7 6.4 Seismic performance objectives. 8 6.5 Judgment 8 6.6 Documentation . 8 7 Seismic retrofit plan . 9 7.1 General . 9 7.2 Selection of performance objectives of the seismic retrofit . 9 7.3 Selection of basic strategy for seismic retrofit 9 7.4 Planning of retrofit .10 7.5 Seismic re-eva
6、luation .10 7.6 Confirmation 10 7.7 Documentation 10 8 Seismic retrofit execution 11 8.1 General 11 8.2 Detailed inspection for construction 11 8.3 Planning of retrofit construction 11 8.4 Quality assurance.11 8.5 Documentation 11 Bibliography .13 ISO 2015 All rights reserved iii Contents Page ISO 1
7、6711:2015(E) 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
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9、n 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 documents should be note
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13、mentary information The committee responsible for this document is ISO/TC 71, Concrete, reinforced concrete and pre-stressed concrete, Subcommittee SC 7, Maintenance and repair of concrete structures.iv ISO 2015 All rights reserved ISO 16711:2015(E) Introduction Earthquakes bringing damage to struct
14、ures have occurred frequently in many areas of the world. Heavy damage caused by earthquakes are concentrated on vulnerable structures. Due to these damaging earthquakes, human lives are lost and confusion in everyday life and stagnation of economic activities occur. As the result of the direct acti
15、on of earthquakes, structures may collapse or overturn in earthquake- prone areas. However, given a main shock occurs, it is expected that through seismic assessment and retrofit of concrete structures, human life losses, economical losses, and structural collapses could be mitigated and/or prevente
16、d and quick recovery could be attained. In some nations, such as Japan and USA, the framework for the identification of vulnerable structures before and after an earthquake, seismic retrofit decision-making and construction exists. In addition, the standards for seismic assessment technology and for
17、 seismic retrofit technology are already established in those nations. Furthermore, technical manuals, in order to apply the standards to practical work, are established. Therefore, based on these standards, the social system is built where a country, a district and a local administrative agency (au
18、thorities), the owner of the structure, a user, a retrofit designer, a retrofit work supervisor, a retrofit work supplier, and other people concerned on this matter share a purpose of the seismic retrofit and the information about the effect of seismic retrofit, and the owner of the structure can ju
19、dge the necessity of appropriate retrofit, and a seismic retrofit execution is carried out smoothly. However, it is not so frequent that a huge earthquake disaster occurs in a specific country or an area. These conditions disturb conducting seismic assessment, seismic retrofit work, and smooth socia
20、l decision making to conduct seismic retrofit. As a result, it is feared that the earthquake disaster will expand and the recovery from the disaster will be delayed when a large earthquake disaster happens once. Therefore, it is necessary to establish a principle of seismic assessment, decision maki
21、ng for seismic retrofit, the framework of the procedure for screening the vulnerable structures, and seismic retrofit execution. This International Standard provides comprehensive principle on the evaluation of the seismic damage/expected damage of existing reinforced concrete structures and repair/
22、retrofit. In other words, this International Standard provides the standard work items related to seismic assessment and retrofit, and standard procedures in each stage, and makes contents and the scope of each duty clear. In this International Standard, the seismic performance of existing reinforce
23、d concrete structures is expressed in terms of the intensity of earthquake motions that will lead the structures to the safety limit state 1)in principle. As the result, whether the existing RC structures fulfill the provisions of the design standard in the specific country or area does not matter.
24、That is the feature of this International Standard. The retrofit can be also conducted based on seismic performance, not on whether the seismic retrofit meets an existing standard. Because this International Standard set such a rational performance requirement mentioned above, the vulnerable parts w
25、hich should be reinforced are clearly identified. 1) Ultimate limit state is mainly considered. However, other limit states may be considered such as seismic damage control limit state when time history analysis is used. ISO 2015 All rights reserved v Seismic assessment and retrofit of concrete stru
26、ctures 1 Scope The purpose of this International Standard is to reduce the risk of seismic damage by structural collapse or turnover during a seismic event. This International Standard provides frameworks and principles of methods of detailed seismic assessment and the judgment, seismic retrofit pla
27、n and design, seismic retrofit execution of existing reinforced concrete structures before the occurrence of a severe earthquake and of the structures struck by an earthquake. This International Standard is applicable to reinforced concrete structures and pre-stressed concrete structures that have b
28、een designed on the basis of the structural design criteria set in a specific country or region. It is not applicable to either unreinforced concrete structures or masonry structures. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and
29、 are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. There are no normative references. 3 Terms and definitions For the purposes of this document, the fo
30、llowing terms and definitions apply. 3.1 assessment set of activities performed in order to verify the reliability of an existing structure for future use SOURCE: ISO 13822:2010 3.2 collapse loss of the load-carrying capacity of a component or member within a structure or of the structure itself 3.3
31、 damage control limit state ability of a structure or structural element to be repaired physically and economically when damaged under the effects of considered actions 3.4 design documents results of structural calculation and design drawings 3.5 design service life period for which the structure i
32、s assumed to be in adequate condition for its intended purpose or function with anticipated maintenance but without requiring substantial repair being necessary INTERNATIONAL ST ANDARD ISO 16711:2015(E) ISO 2015 All rights reserved 1 ISO 16711:2015(E) 3.6 inspection conformity evaluation by observat
33、ion and judgment accompanied as appropriate by measurement, testing or gauging. SOURCE: ISO 16311-2:2014 Note 1 to entry: For structures, this evaluation consists of actions collecting information on the current state of a structure through observation and simplified non-destructive or destructive t
34、esting supplemented with materials and structural testing, as required. 3.7 investigation collection of information through inspection, document search, load testing and other testing SOURCE: ISO 16311-1:2014 3.8 limit of displacement allowable deformation of the structure in terms of parameters suc
35、h as inter-story drift and overall horizontal displacement, to control excessive deflection, cracking and vibration 3.9 limit state critical state specified using a performance index, beyond which the structure no longer satisfies a design performance requirement SOURCE: ISO 19338:2014 3.10 maintena
36、nce set of activities taken to check, evaluate, and preserve/restore structural performance so as to satisfy in service performance requirements SOURCE: ISO 16311-1:2014 3.11 structural repair restoration of a structure or its components to an acceptable condition by the renewal or replacement of wo
37、rn, damaged or deteriorated components SOURCE: ISO 13823:2008 Note 1 to entry: Repair is adopted to restore structural performance and to mitigate safety risks up to the initially required design level and to achieve the intended service life. 3.12 restorability (or reparability) ability of a struct
38、ure or structural element to be repaired physically and economically when damaged under the effects of considered actions SOURCE: ISO 19338:2014 3.13 life safety performance level ability of a structure or structural element to ensure no casualty to users of, and people around, the structure, within
39、 the limits of acceptable probability SOURCE: ISO 19338:20142 ISO 2015 All rights reserved ISO 16711:2015(E) 3.14 seismic capacity force or displacement defined for the limit states Note 1 to entry: Multiple limit states could be selected besides the life safety limit state, such as acceptable econo
40、mic loss limit state, reparability limit state, immediate occupancy limit state, or functionality limit state. 3.15 performance objective required performance level (e.g. life safety) for a given earthquake hazard level (e.g. an earthquake with a 10 % probability of exceedance in 50 years) 3.16 seis
41、mic damage physical evidence of inelastic deformation, cracks or spalling of a structural component caused by an earthquake 3.17 seismic retrofit restoring or improving the seismic performance of a pre- or post-earthquake existing structure to meet the seismic performance objective, including “struc
42、tural repair” and “strengthening” 3.18 serviceability ability of a structure or structural elements to provide appropriate behaviour or functionality in use under the effects of considered actions at serviceability limit state SOURCE: ISO 19338:2014 3.19 service life actual period during which a str
43、ucture meets the prescribed performance requirement SOURCE: ISO 16311-1:2014 3.20 strengthening measures taken to improve structural performance relating to load bearing capacity and deformation of an existing structure and/or its members SOURCE: ISO 16311-1:2014 4 Framework of Assessment and Retrof
44、it The seismic assessment and retrofit of an existing structure should obey the following procedures after identifying the performance requirements and drafting an overall plan from investigation through detailed seismic assessment, construction and documentation. The schematic of the process is sho
45、wn in Figure 1. Details of each item are described after Clause 5. All of these items are not necessarily executed; the procedure should be initiated in order from (1), but it may be finished at any stage according to the specific situation under consideration. (1) Preliminary assessment The possibi
46、lity of a structures collapse or turnover under severe earthquake should be assessed based on the comprehensive information of the structure, such as design documents at the time of design, history of usage and the constructions compliance with the design standard. The inspection of the seismic perf
47、ormance should be carried out in consultation with the client (the owner, the authority, etc.), if the seismic performance is suspected or not clearly adequate. ISO 2015 All rights reserved 3 ISO 16711:2015(E) (2) Detailed seismic assessment In order to make them clear, those are seismic capacity of
48、 an existing RC structure or PSC structure and vulnerable parts in it, detailed seismic assessment should be conducted. And also, the necessity of the seismic retrofit should be determined by comparing the evaluated seismic performance and the seismic performance objectives. The planning of the seis
49、mic retrofit should be carried out in consultation with the client (the owner, the authority, etc.), if the deficiency in seismic performance is confirmed. (3) Planning of seismic retrofit The plan of the seismic retrofit including outline of the retrofit and construction method should be determined. The validity of the plan should be verified by estimating the seismic performance of the structure after construction. The seismic retrofit execution should be then carried out in consultation with the client (the owner, the authority, e
