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Durability and the factor method of ISO 15686-1
Högskolan i Gävle.
2003 (English)In: Building Research & Information, ISSN 0961-3218, E-ISSN 1466-4321, Vol. 31, no 6, 416-426 p.Article in journal (Refereed) Published
Abstract [en]

Interest in the service life of buildings and components and the future need for maintenance is growing, and the methodology for service life planning is starting to appear in standards. The standard ISO 15686 prescribes a factor methodology for deciding about the expected service life of a component with a prescribed probability of earlier failure. The methodology is based on extensive knowledge about materials and building technology, and examples of the use of this methodology on building components are of value for the discussion on service life planning. Results from a condition survey of timber windows are used to define the service life and effect of the factor method in the Standard. Wood is a very variable material, and for wooden windows maintenance plays a key role in the durability of the component. In this instance, condition assessment is, therefore, not sufficient to estimate the service life. Information about former maintenance and refurbishment is also needed. The results from a condition assessment and the house owner's answers to a questionnaire are combined to evaluate the estimated service life of the windows. The factors for the standardized method for estimating service life with a given confidence limit are shown to have a wide range in values that give considerable uncertainty to the practical use of the standardized methodology. For example, it is shown that the estimated service life with an 80% confidence limit is much lower than the average service life. Thus, the question is posed whether there is any meaning in estimating the lower limit of service life.

Place, publisher, year, edition, pages
2003. Vol. 31, no 6, 416-426 p.
Keyword [en]
building inspection, building stock, components, condition assessment, durability, maintenance, performance, service life, whole life costs
National Category
Building Technologies
Identifiers
URN: urn:nbn:se:kth:diva-25349DOI: 10.1080/0961321032000105412ISI: 000186897200001OAI: oai:DiVA.org:kth-25349DiVA: diva2:357610
Note
QC 20101019Available from: 2010-10-19 Created: 2010-10-19 Last updated: 2017-12-12Bibliographically approved
In thesis
1. Service life estimation in building design: A development of the factor method
Open this publication in new window or tab >>Service life estimation in building design: A development of the factor method
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The built environment usually constitutes a very important part of the real capital of a nation, and the construction sector represents more than 10% of the yearly Gross National Product of the industrialised world. Good planning of all construction is important, and consideration of the service life of the work is of great interest and is a significant aspect of sustainability considerations. The need for more knowledge about degradation of materials, for structured methodology, and for working tools for those involved in the planning process, has resulted in an extensive effort in pre-normative research and standardisation regarding this field.

This thesis presents a discussion on service life planning and the role of the Factor Method in such work, and especially, discussion of modification and development of the methodology. In the design process, the need to evaluate the service life of products is a great challenge, as the results will depend on both material properties and the environment in which the material is placed or used. A practical solution has to be based on a good knowledge in the field, but also on a sound working strategy, to ensure that different design scenarios can be compared in a standardised or structured way. The Factor Method is a promising working tool for such an evaluation and comparison, but is as such, still more of a methodology, than a method. Examples of the use of the methodology are still very limited, and the method as such, is much discussed by researchers. However, its future will depend upon how practical it will be to apply in use. The method is useful to estimate the service life of products, based on a known reference service life and a number of modifying factors. These factors in turn depend on the conditional differences between the specific project and the reference, in-use conditions. This thesis discusses the required precision of such a methodology, especially in light of inherent distributions in material properties, and the fact that the consequences of failure are often very limited. In such cases, the standardised Factor Method is considered to be quite useful, and should give the parties involved a good means for working in a structured and systematic way.

Place, publisher, year, edition, pages
Stockholm: KTH, 2005. viii, 62 p.
Keyword
Construction engineering, factor method, service life prediction, durability, degradation, Byggnadsteknik
National Category
Building Technologies
Identifiers
urn:nbn:se:kth:diva-201 (URN)91-7178-026-2 (ISBN)
Public defence
2005-05-20, hörsalen, ITB-Brynäs, S Sjötullsgatan 3, Gävle, 08:00
Opponent
Supervisors
Note
QC 20101019Available from: 2005-05-15 Created: 2005-05-15 Last updated: 2010-10-19Bibliographically approved

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