Books and journals Case studies Expert Briefings Open Access
Advanced search

Search results

1 – 10 of over 92000
To view the access options for this content please click here
Article
Publication date: 13 August 2018

Research on resistance degradation and reliability of pre-stressed concrete structures in freeze-thaw zone

Jinliang Liu, Yanmin Jia, Guanhua Zhang and Jiawei Wang

In the freeze-thaw zone, the pre-stressed concrete of bridge structure will be damaged by freezing-thawing, the bearing capacity of structure will decrease and the safety…

HTML
PDF (734 KB)

Abstract

Purpose

In the freeze-thaw zone, the pre-stressed concrete of bridge structure will be damaged by freezing-thawing, the bearing capacity of structure will decrease and the safety will be affected. The purpose of this paper is to establish the time-dependent resistance degradation model of structure in the freeze-thaw zone, and analysis the structural reliability and remaining service life in different freeze-thaw zones.

Design/methodology/approach

First, according to the theory of structural design, a calculation model of the resistance of pre-stressed concrete structures in f freeze-thaw zone is established. Second, the time-dependent resistance model was verified by the test beam bending failure test results done by the research group, which has been in service for 20 years in freeze-thaw zone. Third, using JC algorithm in MATLAB to calculate the index on the reliability of pre-stressed concrete structure in frozen thawed zones, forecasting the s remaining service life of structure.

Findings

First, the calculation model of the resistance of pre-stressed concrete structures in freeze-thaw zone is accurate and it has excellent applicability. Second, the structural resistance deterioration time in Wet-Warm-Frozen Zone is the earliest. Third, once the pre-stressed reinforcement rusts, the structural reliability index will reach limit value quickly. Finally, the remaining service life of structure meets the designed expectation value only in a few of freeze-thaw zones in China.

Originality/value

The research will provide a reference for the design on the durability of a pre-stressed concrete structure in the freeze-thaw zone. In order to verify the security of pre-stressed concrete structures in the freeze-thaw zone, engineers can use the model presented in this paper for durability checking, it has an important significance.

Details

International Journal of Structural Integrity, vol. 9 no. 4
Type: Research Article
DOI: https://doi.org/10.1108/IJSI-07-2017-0044
ISSN: 1757-9864

Keywords

  • Freeze-thaw zone
  • JC algorithm
  • Pre-stressed concrete structure
  • Remaining service life
  • Time-dependent reliability
  • Time-dependent resistance deterioration

To view the access options for this content please click here
Article
Publication date: 1 October 2006

Developing an effective service life asset management and valuation model

Rob Kooymans and James Abbott

This paper seeks to describe the development and testing of a depreciated replacement cost model for a portfolio of corporate real estate assets.

HTML
PDF (76 KB)

Abstract

Purpose

This paper seeks to describe the development and testing of a depreciated replacement cost model for a portfolio of corporate real estate assets.

Design/methodology/approach

A model was developed in Microsoft Excel, using depreciation rates and adjustment factors derived from readily‐available tables applied to elemental building costs. The model was applied to an actual property portfolio, with the costs of data‐gathering being estimated.

Findings

The developed model proved to be effective in both planning and managing maintenance and capital expenditure, with application to life‐cycle maintenance and replacement decisions. The model was successfully used to conduct a replacement cost valuation on the test portfolio. It was found that the cost of the initial detailed data‐gathering could be repaid in a relatively short time by use of the model.

Practical implications

The methodology appears to be widely applicable to corporate real estate portfolios, with depreciation rates and methods, and levels of detail of components used being able to be changed to suit individual country and portfolio circumstances.

Originality/value

Provides a model useful for harnessing basic property information into a sophisticated day‐to‐day and strategic portfolio management tool.

Details

Journal of Corporate Real Estate, vol. 8 no. 4
Type: Research Article
DOI: https://doi.org/10.1108/14630010610714871
ISSN: 1463-001X

Keywords

  • Real estate
  • Replacement costs
  • Life cycle costs
  • Assets valuation
  • Databases

To view the access options for this content please click here
Article
Publication date: 1 February 1991

Capital Budgeting for Replacements with Unequal Remaining Life

LeRoy D. Brooks

A capital budgeting decision procedure appropriate for choosing the continuance, replacement, or abandonment of an asset‐in‐place is examined. The optimal replacement…

HTML
PDF (591 KB)

Abstract

A capital budgeting decision procedure appropriate for choosing the continuance, replacement, or abandonment of an asset‐in‐place is examined. The optimal replacement decision on an asset already in service requires simultaneous consideration of project life, project chaining, and possible abandonment points for both the asset‐in‐place and the replacement asset. The additional information required for the suggested procedure over the traditional replacement procedure is generally manageable and a practical solution procedure is feasible.

Details

Managerial Finance, vol. 17 no. 2/3
Type: Research Article
DOI: https://doi.org/10.1108/eb013671
ISSN: 0307-4358

To view the access options for this content please click here
Book part
Publication date: 20 October 2020

Infrastructure Finance Policy, Capital Management and Budgeting Processes, and PPPs as an Infrastructure Financing Option

Jane Beckett-Camarata

HTML
PDF (227 KB)
EPUB (760 KB)

Abstract

Details

Public-Private Partnerships, Capital Infrastructure Project Investments and Infrastructure Finance
Type: Book
DOI: https://doi.org/10.1108/978-1-83909-654-920201005
ISBN: 978-1-83909-654-9

To view the access options for this content please click here
Article
Publication date: 16 November 2017

Systematic approach for asset management of urban water pipeline infrastructure systems

Hamed Zamenian, Juyeong Choi, Seyed Amir Sadeghi and Nader Naderpajouh

The purpose of this paper is to develop a systemic approach to evaluate physical condition of water pipeline infrastructure with limited condition assessment data that can…

HTML
PDF (398 KB)

Abstract

Purpose

The purpose of this paper is to develop a systemic approach to evaluate physical condition of water pipeline infrastructure with limited condition assessment data that can help asset managers prioritize capital investments in maintenance projects for urban water pipeline systems.

Design/methodology/approach

Spatial pattern analyses are conducted in this research to find the spatial pattern of the service life of pipelines. Based on the spatial relationship, the critical areas where groups of pipelines with short service life are likely to be found were located using spatial statistical analyses. A visualized platform was also developed and used to validate the implementation of the proposed approach with the case study of urban water pipeline infrastructure in a city in the Midwest region of the USA.

Findings

The results of the spatial pattern analyses reveal that water pipelines are spatially clustered based on their service life. Further, it was found that on average the pipelines in the center of a city have longer service life while the average expected service life of the pipelines in the marginal areas is shorter. The interpolation method produced raster data with continuous information about the service years of pipelines that are useful for asset maintenance planning.

Originality/value

With the limited data, the proposed approach enables identification of the critical area of water pipelines with the likelihood of shorter service life. This result can be used as a priority rule for a rehabilitation plan and contributes to shifting from a responsive to a preventive approach in underground asset management.

Details

Built Environment Project and Asset Management, vol. 7 no. 5
Type: Research Article
DOI: https://doi.org/10.1108/BEPAM-01-2017-0005
ISSN: 2044-124X

Keywords

  • Asset management
  • Preventive maintenance
  • Geographical information systems
  • Underground infrastructure systems
  • Urban infrastructure
  • Water pipeline network

To view the access options for this content please click here
Article
Publication date: 19 June 2017

Maintenance programmes for flat roofs in existing buildings

João Morgado, Inês Flores-Colen, Jorge de Brito and Ana Silva

The purpose of this paper is to propose a maintenance programme for flat roofs in existing buildings, based on the inspection of 26 buildings in-service conditions…

HTML
PDF (2 MB)

Abstract

Purpose

The purpose of this paper is to propose a maintenance programme for flat roofs in existing buildings, based on the inspection of 26 buildings in-service conditions, located in the Lisbon region, in Portugal. A proactive maintenance of flat roofs in existing buildings allows reducing their pathology, thus improving their performance and service life.

Design/methodology/approach

The maintenance plan was established based on the degradation state of the maintenance source elements (MSEs) analysed, the aggressiveness of the surrounding environment and the age of the roofs and maintenance actions carried out during the roofing systems’ life cycle.

Findings

The maintenance plan proposed in this study includes the prioritization of the interventions, the definition of the required maintenance operations and the definition of the frequency of the intervention, considering the service lives of the MSEs.

Research limitations/implications

The study addresses only roofs located in the Lisbon area. Even though a relatively large sample of 26 roofs was used, the findings and conclusions can clearly be extrapolated for a much wider scope.

Practical implications

The maintenance plan proposed in this study considers a planning of proactive maintenance operations to continuously and effectively monitor all the relevant MSE.

Originality/value

This plan allows minimizing the incidence and spread of defects, thus enabling the optimization of resources, reducing the costs of the entire maintenance system and improving the quality of the built environment.

Details

Property Management, vol. 35 no. 3
Type: Research Article
DOI: https://doi.org/10.1108/PM-08-2016-0040
ISSN: 0263-7472

Keywords

  • Building defects
  • Flat roofs
  • Maintenance plans
  • Priority of interventions

Content available
Book part
Publication date: 4 May 2018

Life-Cycle Performance of a Bridge Subjected to Multiple Heavy Vehicle Impacts

Maizuar, Lihai Zhang, Russell Thompson and Herman Fithra

Purpose – The purpose of this study is to develop a numerical framework to predict the time-dependent probability of failure of a bridge subjected to multiple vehicle…

Open Access
HTML
PDF (1 MB)
EPUB (510 KB)

Abstract

Purpose – The purpose of this study is to develop a numerical framework to predict the time-dependent probability of failure of a bridge subjected to multiple vehicle impacts. Specially, this study focuses on investigating the inter-relationship between changes in life-cycle parameters (e.g., damage size caused by vehicle impact, loss of initial structural capacity, and threshold intervention) and bridges probability of failure.

Design/Methodology/Approach – The numerical procedure using MATLAB program is developed to compute the probability failure of a bridge. First, the importance and characteristics of life-cycle analysis is described. Then, model for damage accumulation and life cycle as a result of heavy vehicle impacts is discussed. Finally, the probability of failure of a bridge subjected to vehicle impacts as a result of change in life-cycle parameters is presented.

Findings – The results of study show that damage size caused by both vehicle impacts and loss of initial structural capacity have a great impact on the long-term safety of bridges. In addition, the probability of failure of a bridge under different threshold limits indicates that the structural intervention (e.g., repair or maintenance) should be undertaken to extend the service life of a bridge.

Research Limitations/Implications – The damage sizes caused by heavy vehicle impacts are based on simple assumptions. It is suggested that there would be a further study to estimate the magnitude of bridge damage as a result of vehicle impact using the full-scale impact test or computational simulation.

Practical Implications – This will allow much better predictions for residual life of bridges which could potentially be used to support decisions on health and maintenance of bridges.

Originality/Value – The life-cycle performance for assessing the time-dependent probability of failure of bridges subjected to multiple vehicle impact has not been fully discussed so far.

Details

Proceedings of MICoMS 2017
Type: Book
DOI: https://doi.org/10.1108/978-1-78756-793-1-00003
ISBN:

Keywords

  • Life-cycle
  • vehicle impact
  • structural deterioration
  • bridge

To view the access options for this content please click here
Article
Publication date: 16 October 2020

Similarity-based information fusion grey model for remaining useful life prediction of aircraft engines

Xiaoyu Yang, Zhigeng Fang, Xiaochuan Li, Yingjie Yang and David Mba

Online health monitoring of large complex equipment has become a trend in the field of equipment diagnostics and prognostics due to the rapid development of sensing and…

HTML
PDF (1.8 MB)

Abstract

Purpose

Online health monitoring of large complex equipment has become a trend in the field of equipment diagnostics and prognostics due to the rapid development of sensing and computing technologies. The purpose of this paper is to construct a more accurate and stable grey model based on similar information fusion to predict the real-time remaining useful life (RUL) of aircraft engines.

Design/methodology/approach

First, a referential database is created by applying multiple linear regressions on historical samples. Then similarity matching is conducted between the monitored engine and historical samples. After that, an information fusion grey model is applied to predict the future degradation trajectory of the monitored engine considering the latest trend of monitored sensory data and long-term trends of several similar referential samples, and the real-time RUL is obtained correspondingly.

Findings

The results of comparative analysis reveal that the proposed model, which is called similarity-based information fusion grey model (SIFGM), could provide better RUL prediction from the early degradation stage. Furthermore, SIFGM is still able to predict system failures relatively accurately when only partial information of the referential samples is available, making the method a viable choice when the historical whole life cycle data are scarce.

Research limitations/implications

The prediction of SIFGM method is based on a single monotonically changing health indicator (HI) synthesized from monitoring sensory signals, which is assumed to be highly relevant to the degradation processes of the engine.

Practical implications

The SIFGM can be used to predict the degradation trajectories and RULs of those online condition monitoring systems with similar irreversible degradation behaviors before failure occurs, such as aircraft engines and centrifugal pumps.

Originality/value

This paper introduces the similarity information into traditional GM(1,1) model to make it more suitable for long-term RUL prediction and also provide a solution of similarity-based RUL prediction with limited historical whole life cycle data.

Details

Grey Systems: Theory and Application, vol. ahead-of-print no. ahead-of-print
Type: Research Article
DOI: https://doi.org/10.1108/GS-05-2020-0066
ISSN: 2043-9377

Keywords

  • GM(1,1)
  • Remaining useful life
  • Similarity-based
  • Information fusion
  • Aircraft engine

To view the access options for this content please click here
Article
Publication date: 30 March 2010

Research opportunities in maintenance of office building services systems

Shaomin Wu, Keith Neale, Michael Williamson and Matthew Hornby

The purpose of this study is to highlight special characteristics of building services systems and investigate how practitioners view reliability and maintenance. These…

HTML
PDF (72 KB)

Abstract

Purpose

The purpose of this study is to highlight special characteristics of building services systems and investigate how practitioners view reliability and maintenance. These characteristics include energy‐hungry services systems, operating modes, maintenance types, the relationship between procurement costs and maintenance costs.

Design/methodology/approach

The practitioners' viewpoints on reliability and maintenance are explored through a workshop. The authors wish to draw the attention of researchers in the reliability and maintenance community and furthermore emphasise the difference between building services systems and systems in industries other than construction.

Findings

It is shown that a lack of failure data and maintenance data is the main problem from both academic researchers' and industrial practitioner's points of view. The paper suggests that there exists no fixed cost ratio available to apply to building services systems; the analysis of RAMS (Reliability, Availability, Maintainability and Safety) should include duty cycles and the environment; and clients of the construction industry would benefit from mandating a LCC to be applied to the build.

Practical implications

The gap between academia and practitioners should be bridged through better understanding each other's needs. Accurately estimating the ratio between procurement and maintenance costs is needed from a whole life costing perspective.

Originality/value

This paper is a good reference for building designers, facility managers and maintenance staff of building services systems. It also offers reliability researchers references on special characteristics of building services systems.

Details

Journal of Quality in Maintenance Engineering, vol. 16 no. 1
Type: Research Article
DOI: https://doi.org/10.1108/13552511011030309
ISSN: 1355-2511

Keywords

  • Maintenance
  • Reliability management
  • Building services
  • Heating and ventilation services

To view the access options for this content please click here
Article
Publication date: 1 October 1962

Problems of Assessing Quality of Performance of Steam Turbine Oils

E.G. ELLIS

IN the editorial of the July number of Scientific Lubrication a case is quoted of a user who appar‐ently replenishes his steam turbine with additives while it is in service…

HTML
PDF (607 KB)

Abstract

IN the editorial of the July number of Scientific Lubrication a case is quoted of a user who appar‐ently replenishes his steam turbine with additives while it is in service. It appears that this (Chicago) user finds that this practice serves him well but the Editor finds it rather unusual and invites the opinion of additive manufacturers and further queries whether such self help could be applied to lubricants other than turbine oils.

Details

Industrial Lubrication and Tribology, vol. 14 no. 10
Type: Research Article
DOI: https://doi.org/10.1108/eb052703
ISSN: 0036-8792

Access
Only content I have access to
Only Open Access
Year
  • Last week (231)
  • Last month (793)
  • Last 3 months (2385)
  • Last 6 months (4457)
  • Last 12 months (8240)
  • All dates (92880)
Content type
  • Article (74379)
  • Book part (14157)
  • Earlycite article (2842)
  • Case study (1161)
  • Expert briefing (330)
  • Executive summary (9)
  • Graphic analysis (2)
1 – 10 of over 92000
Emerald Publishing
  • Opens in new window
  • Opens in new window
  • Opens in new window
  • Opens in new window
© 2021 Emerald Publishing Limited

Services

  • Authors Opens in new window
  • Editors Opens in new window
  • Librarians Opens in new window
  • Researchers Opens in new window
  • Reviewers Opens in new window

About

  • About Emerald Opens in new window
  • Working for Emerald Opens in new window
  • Contact us Opens in new window
  • Publication sitemap

Policies and information

  • Privacy notice
  • Site policies
  • Modern Slavery Act Opens in new window
  • Chair of Trustees governance statement Opens in new window
  • COVID-19 policy Opens in new window
Manage cookies

We’re listening — tell us what you think

  • Something didn’t work…

    Report bugs here

  • All feedback is valuable

    Please share your general feedback

  • Member of Emerald Engage?

    You can join in the discussion by joining the community or logging in here.
    You can also find out more about Emerald Engage.

Join us on our journey

  • Platform update page

    Visit emeraldpublishing.com/platformupdate to discover the latest news and updates

  • Questions & More Information

    Answers to the most commonly asked questions here