Service-life assessment of building components: application of evidence theory

2008 ◽  
Vol 35 (3) ◽  
pp. 287-300 ◽  
Author(s):  
A. Talon ◽  
D. Boissier ◽  
J. Lair
Keyword(s):  
Service Life ◽  
Evidence Theory ◽  
Life Assessment ◽  
Design Stage ◽  
Life Data ◽  
Performance Requirements ◽  
Short Term Exposure ◽  
Building Components ◽  
Building Component ◽  
Service Building

This paper deals with the assessment of the service life of in-service building components subjected to known environmental and usage conditions. This assessment is complex because of two primary features. First, the assessment has to be carried within a multiscale context: a geometric scale that ranges from the material or elemental to building scale; a range in the complexity of the degradation (phenomena that varies from a single phenomenon to the consideration of several degradation scenarios); a range of possible performance requirements, from one function to several; and consideration, as well, to the time over which the process is carried out that may span from the design stage to that of management and repair. Second, this assessment must also take into consideration the availability and features of service-life data that by nature is heterogeneous, imprecise, uncertain, and incomplete. In this context, a comprehensive methodology is developed using all available data on service life derived from existing methods of service-life assessment of materials, elements or building components. Such data may, for example, be extracted from fundamental studies on durability, accelerated short-term exposure tests, statistical methods, factorial methods, feedback from practice, or expert opinion or other sources. The main stages of this methodology are: (i) identification of all possible degradation scenarios provided by failure mode and effects analysis (FMEA); (ii) collection of all available service-life data (SL-data) associated with these degradation scenarios, transformation of this data into a fuzzy-set format, and assessment of its quality; (iii) processing of unification of data and aggregation of data; and (iv) assessment of the service life of building components. The case study of a window unit allows for: (i) service-life assessment of a building component to be processed by unification of data and aggregation of data and (ii) a conclusion to be deduced.

Building Component Maintenance/Repair Management: an Economic Analysis Simulation

2011 ◽  
Vol 94-96 ◽  
pp. 2134-2137
Author(s):  
Nima Amani ◽  
Nasly Bt Mohamed Ali ◽  
Seyedmohsen Hosseini
Keyword(s):  
Service Life ◽  
Economic Analysis ◽  
Condition Index ◽  
Repair System ◽  
Repair Cost ◽  
Maintenance And Repair ◽  
Limited Budget ◽  
Development Tool ◽  
Building Components ◽  
Building Component

Starting, implementation, and operation of building facilities system are very vital, especially under limited budget. To component repair cost decisions, suitable assessment, and accurate prediction of the condition of assets are essential. The purpose of this study is at supporting the condition assessment and predicting the future of component condition by NCES condition metrics. This paper reflects on the NCES condition index process in maintenance and repair system of building components by research in similar subjects and looks specifically at the use of NCES condition index (CI) as a development tool. The result of research can be used as a guide to assist component managers and building owners to make suitable decisions about component appropriate maintenance based on limited budget during its service life.

scholarly journals Influence of methodological choices on maintenance and replacement in building LCA

2021 ◽  
Author(s):  
Nicolas Francart ◽  
Torun Widström ◽  
Tove Malmqvist
Keyword(s):  
Service Life ◽  
Illustrative Case ◽  
Methodological Choices ◽  
Life Data ◽  
Major Operation ◽  
Building Components ◽  
Illustrative Case Study ◽  
Methodological Aspects ◽  
The Impact

Abstract Purpose Previous life cycle assessments (LCAs) of buildings and building components show a broad range of values for the impact of maintenance and replacement, some highlighting these operations as major hotspots while others consider them insignificant. This article highlights methodological aspects explaining this discrepancy. The influence of three aspects is investigated further in a case study of façade materials: the reference study period (RSP), service life data, and the use of a round-up number of operations or annualized impacts. Methods A comparative LCA of seven façade alternatives is carried out as an illustrative case study. For each alternative, global warming potential (GWP) is calculated using three possible RSPs, four possible material service lives (one from industry practitioners and low, standard and high values from a generic database), and two possible calculation methods (round-up or annualized impacts). Results and discussion While the same façade alternative had the lowest GWP in all cases, different methodological choices significantly affected the GWP and respective ranking of other alternatives. Some alternatives showed a significant increase in GWP over longer RSPs, while others were still dominated by the impact of initial production after 200 years. In nearly all cases, generic service life data lead to a higher GWP than data from industry practitioners. Major discrepancies were found between generic and practitioner data in some cases, e.g., for the brick façade. In most cases, annualized impacts led to a slightly lower (or equal) GWP than using a round-up number of operations. However, when a major operation happens shortly before the end of the RSP, the annualized method leads to considerably lower GWP. Conclusions Maintenance and replacement are rarely significant over a 50-year RSP but sometimes become hotspots over longer RSPs. Using round-up operations or annualized impacts does not make much difference in average, but leads to significantly different results in specific cases. As building LCA enters certification and regulation, there is a need to harmonize such methodological choices, as they affect LCA results, hotspot identification, and recommendations. Discrepancies in service life data also call for the gathering of reliable data.

scholarly journals The thermal history and stress state of a fresh steam-pipeline influencing its remaining service life

2011 ◽  
Vol 15 (3) ◽  
pp. 691-704 ◽  
Author(s):  
Gordana Bakic ◽  
Vera Sijacki-Zeravcic ◽  
Milos Djukic ◽  
Stevan Maksimovic ◽  
Dusan Plesinac ◽  
...  
Keyword(s):  
Service Life ◽  
Elevated Temperatures ◽  
Operating Temperature ◽  
Life Assessment ◽  
Temperature History ◽  
Significant Variable ◽  
Remaining Life ◽  
Pipe Bend ◽  
Steam Pipeline ◽  
Remaining Life Assessment

The service life of thick-walled power plant components exposed to creep, as is the case with pipelines of fresh- and re-heated steam, depend on the exhaustion rate of the material. Plant operation at elevated temperatures and at temperatures below designed temperatures all relates to the material exhaustion rate, thus complicating remaining life assessment, whereas the operating temperature variation is a most common cause in the mismatching of real service- and design life. Apart from temperature, the tube wall stress is a significant variable for remaining life assessment, whose calculation depends on the selected procedure, due to the complex pipeline configuration. In this paper, a remaining life assessment is performed according to the Larson-Miller parametric relation for a ?324?36 pipe bend element of a fresh steam-pipeline, made of steel class 1Cr0.3Mo0.25V, after 160 000 hours of operation. The temperature history of the pipeline, altogether with the pipe bend, is determined based on continuous temperature monitoring records. Compared results of remaining life assessment are displayed for monitored temperature records and for designed operating temperature in the same time period. The stress calculation in the pipe bend wall is performed by three methods that are usually applied so to emphasize the differences in the obtained results of remaining life assessment.

Influence of facilities performance on student’s satisfaction in Northern Nigerian universities

Facilities ◽  
2019 ◽  
Vol 37 (3/4) ◽  
pp. 168-181 ◽  
Author(s):  
Isa Abdullahi ◽  
Wan Zahari Wan Yusoff
Keyword(s):  
Higher Education ◽  
Student Satisfaction ◽  
Structural Characteristics ◽  
Assessment Method ◽  
Success Factor ◽  
Validity And Reliability ◽  
Content Type ◽  
Building Components ◽  
Building Component ◽  
Students Satisfaction

PurposeHigher institutions in Nigeria have witnessed an increase in the number of student enrolments; Northern Nigerian universities are not excluded. As the number of students increases, so do their needs in terms of facilities such as lecture halls, libraries, laboratories, accommodation, studios, furniture and other auxiliary facilities services (among others things). The purpose of this study is to explore the structural characteristics of building features’ performance and to statistically group them into building components (dependent) and physical and non-physical building features (independent) constructs, relating to influence of facilities’ performance in student satisfaction in Northern Nigerian universities.Design/methodology/approachQuestionnaires used were designed to collect data on both academic facilities, based on student experience and satisfaction with respect to physical and non-physical facilities. The school building assessment method questionnaire by Sanoff (2001) was adapted. Hence, the validity and reliability of measures was examined via academicians and data analysis with statistical package of social science (SPSS) version 22. In general, the values of alpha coefficients were above 0.80.FindingsThe result of exploratory factor analysis revealed that all factors loaded more than 0.61. In conclusion, the results indicated acceptable factor loadings and effective grouping of the features according to the conceptualised framework for the building component. A hypothetical model of building components was then proposed, suggesting the effects of physical and non-physical building features on building components.Research limitations/implicationsThis research has been applied to a Northern Nigerian university. The research should be expanded to other institutions offering higher education.Practical implicationsBased on a conceptual framework, the study gives practical insights concerning the performance of building component as a key success factor for higher education institutions’ (HEIs) facilities.Originality/valueTherefore, the need to develop and improve instruments that will reflects facilities performance for students satisfaction in Nigerian universities became paramount. Thus there is lack of an integrating framework for facilities performance as well as students satisfaction and experience in the context of Nigerian HEIs, especially in the region of northern Nigeria.

scholarly journals Modeling the mechanical wear of the contact elements of pantograph during high-speed movement

2020 ◽  
Vol 157 ◽  
pp. 01022
Author(s):  
Victor Philippov ◽  
Alexandr Smerdin
Keyword(s):  
Service Life ◽  
High Speed ◽  
Theoretical Calculations ◽  
Experimental Studies ◽  
Maximum Error ◽  
Life Assessment ◽  
Rolling Stock ◽  
Mechanical Wear ◽  
Wear Process ◽  
Mechanical Component

The use of contact elements with an extended service life is one of the most economical and least costly ways to ensure reliable, economical and environmentally friendly transmission of electricity to rolling stock. To evaluate the service life in OSTU, a methodology for conducting experimental studies of contact pairs of pantograph has been developed and successfully tested, involving bench tests for each pair of contact materials “contact insert - contact wire” in order to determine their optimal combination to reduce wear and increase service life. Assessment of the amount of wear and prediction of the life of the contact elements are made, including using mathematical modeling. The purpose of this article is to improve the mechanical component of the wear model of the contact elements of pantograph in high-speed conditions. The results of experimental studies and theoretical calculations of the mechanical wear of contact elements are presented. The analysis of the graphs allows us to conclude that it is possible to use an improved mathematical model for modeling the mechanical component of the wear process of the elements of contact pairs with a maximum error value of not more than 5%.

scholarly journals Service life planning for electronics, mechanical and electrical components of a hotel building

2018 ◽  
Vol 195 ◽  
pp. 06010
Author(s):  
Peter F. Kaming ◽  
Desi Maryani ◽  
Michael Boenardi
Keyword(s):  
Life Cycle ◽  
Service Life ◽  
Descriptive Statistics ◽  
Life Data ◽  
Life Planning ◽  
Building Maintenance ◽  
Service Period ◽  
Reference Service ◽  
Period Data ◽  
Electrical Components

A hotel building in Yogyakarta was studied for its service life planning of electronic, electrical, and mechanical components the building. The study aims to assess the service life of hotel buildings including its electronics, mechanical and electrical components, and estimating the service life of each of the components. Data was collected from practitioners working in building maintenance office of several hotels in Yogyakarta. The Data was carefully analysed using descriptive statistics. This paper discusses the approaches and application of the availability of reference service life and service period data can be collected and applied in life cycle costing. The results of service-life data for periodical maintenance and replacement for various electronics, both mechanical and electrical parts are also presented for life cycle planning.

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