ISO 13823-2008 General principles on the design of structures for durability《耐久性结构设计的一般原则》.pdf
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1、 Reference number ISO 13823:2008(E) ISO 2008INTERNATIONAL STANDARD ISO 13823 First edition 2008-06-15 General principles on the design of structures for durability Principes gnraux du calcul des constructions pour la durabilit ISO 13823:2008(E) PDF disclaimer This PDF file may contain embedded typef
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4、ized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. COPYRIGHT PROTECTED DOCUMENT ISO 2008 All rights reserved. Un
5、less 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 either ISO at the address below or ISOs member body in the country of the requester. ISO
6、 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 2008 All rights reservedISO 13823:2008(E) ISO 2008 All rights reserved iii Contents Page Foreword iv Introduction v 1 Scope 1 2 Nor
7、mative references 1 3 Terms and definitions .1 4 Symbols 4 5 Application .4 6 Basic concepts for verifying durability .5 6.1 General5 6.2 Structure environment 5 6.3 Transfer mechanisms5 6.4 Environmental action 5 6.5 Action effects .6 6.6 Limit states .6 7 Durability requirements 7 7.1 Basic durabi
8、lity requirement 7 7.2 Formats for checking durability.8 8 Design life of a structure and its components, t D 11 8.1 Structure .11 8.2 Components.11 8.3 Component service life related to the design life of the structure .11 8.4 Difficulty and cost of maintenance or replacement .11 8.5 Consequences o
9、f failure .11 8.6 Selection of target reliability.11 9 Predicted service life, t SP 12 9.1 General12 9.2 Prediction based on experience.13 9.3 Prediction based on modelling 13 9.4 Prediction based on testing14 10 Strategies for durability design14 Annex A (informative) Examples of the application of
10、 the limit-states method .15 Annex B (informative) Examples of influences (structure environment) and agents (environmental action) .26 Annex C (informative) Examples of transfer mechanisms32 Annex D (informative) Environmental actions for structural materials and their control .34 Annex E (informat
11、ive) Procedures for ensuring durability .37 Bibliography 39 ISO 13823:2008(E) iv ISO 2008 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
12、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
13、in the work. ISO collaborates closely with the International 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 pre
14、pare International Standards. Draft International Standards 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
15、some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 13823 was prepared by Technical Committee ISO/TC 98, Bases for design of structures, Subcommittee SC 2, Reliability of structures. ISO 13823
16、:2008(E) ISO 2008 All rights reserved v Introduction The limit-states method, as developed in ISO 2394, has been adopted and used for preparing and harmonizing national and regional structural design standards and codes around the world. Although ISO 2394 includes durability in its principles, the l
17、imit-states method has not been developed for failures due to material deterioration to the extent that it has for failures due to actions such as gravity, wind, snow and earthquake. Also, many premature failures have occurred because of a lack of understanding of material deterioration in the struc
18、tural engineering profession. The first objective in developing this International Standard is to improve the evaluation and design of structures for durability by the incorporation of building-science principles into structural-engineering practice. These principles are now being taught in engineer
19、ing courses in many countries. This goal is achieved by the incorporation of these principles into the limit-states method currently used in structural engineering practice and defined in ISO 2394, and by the use of a common, user-friendly terminology for physical phenomena. Developments have recent
20、ly taken place in mathematical modelling of the mechanisms that cause material deterioration and failure. There is a need to harmonize the use of these models in practice by using the limit- states method and a common terminology. The second objective in developing this International Standard is to
21、provide a framework for the development of mathematical models to predict the service life of components of the structure. Such models are currently being developed, for example, for concrete slabs subjected to chloride diffusion from de-icing salts. These models are material-dependent and, therefor
22、e, are being developed by other ISO/TCs. The goal of this International Standard is to ensure that all analytical models are incorporated into the limit-states method, the same as currently used for the verification and design of structures for gravity, wind, snow and earthquake actions. While this
23、International Standard does not address design procedures for durability, it lays a solid foundation by identifying a process starting from the structures environment, followed by mechanisms that transfer this environment into environmental actions on component materials leading to action effects, s
24、uch as damage (see Figure 1). It is necessary to take this cause-and-effect process into account in developing methods for the prediction of service life. This International Standard is intended to serve a similar unification role as ISO 2394 has had over the past 30 years for the verification and d
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