Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 17 of 17 for “"Remaining Service Life"”.
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Risk-based facility management approach for building components using a discrete Markov process - predicting condition, reliability, and remaining service life
… acceptable level of performance while minimizing life cycle cost and risk. This research presents a framework that explicitly measures the risk and uncertainty associated with building conditions, and uses this framework to support better decisions for facility investment and resource allocation. …
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Parametric Model for Assessing Factors that Influence Highway Bridge Service Life
… impact facility performance and shorten its service life. Socioeconomic, technological, regulatory, and user value changes can substantially increase the service expectations of existing facilities. Based on a theoretical framework drawn from prior work, this research develops a new approach …
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Service Life Assessment of Harbor Structures - Case studies of chloride ingress into concrete and sheet piling corrosion rates
… structures with the purpose of determining their remaining service life. Since the environmental loads on these structures differ substantially depending on their location, both globally and locally, the degradation processes of the structures also differ. Assessment of these types of structures …
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Effective Prestress Evaluation of the Varina-Enon Bridge Using a Long-Term Monitoring System and Finite Element Model
… losses could impact the future performance, serviceability, and flexural strength of the bridge. Accurately quantifying prestress losses is critical for understanding and maintaining the structure during its remaining service life. Long-term prestress losses are estimated in the Varina-Enon …
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Long-Term Monitoring and Evaluation of the Varina-Enon Bridge
To make sound decisions about the remaining life of a structure, the precise calculation of the prestress losses is very important. In post-tensioned structures, the prestress losses due to creep and shrinkage can cause serviceability issues and can reduce flexural capacity. The Varina-Enon Bridge …
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Reliability analysis and service life prediction of pipelines
… should be considered in both the strength and serviceability analysis of pipes. The study in this research focuses on two different types of buried pipes including concrete pipes in sewage systems (concrete sewers) and cast iron water pipes used in water distribution systems. This research …
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GIS-Based Pavement Maintenance Management Model for Local Roads in the UK
… have reached the upper limits of their design life spans while being subjected to increasing traffic. There are many factors that influence the decision making process in pavement maintenance management, including road surface conditions, safety, traffic loading, cost, funding and …
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Prediction of service load of concrete structures after cracking using ultrasonic technique
… and to introduce a new approach to assess their remaining service lives. A novel ultrasonic technique is utilized to detect crack propagation in notched beams of mortar, plain concrete and reinforced concrete. The study showed that crack growth and microcrack zone in cementitious composites can …
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Case-based reasoning for modeling bridge deterioration
… condition of bridges and to estimate their remaining service life. Most of the state-of-the-art BMS's employ Markov Decision Process (MDP) in modeling bridge deterioration. The main shortcomings of Markovian models are that they assume state independence, neglect improvement actions taken in …
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Historic Reinforced Concrete in Alberta: Analysis and Conservation of Two Structures
… cycles and corrosion of the reinforcement. Service life analysis of the two structure is also performed based on theoretical models and test results. Recommendations for extending the remaining service life and conservation and retrofitting of the two structures and similar cases are …
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Development of a phenomenological constitutive model for fracture resistance degradation of asphalt concrete with damage growth due to repeated loading
… For an accurate estimation of pavement life, it is essential to consider the effect of repeated traffic and thermal loading on the fracture resistance of the AC materials. This study investigates the degradation of the fracture resistance of AC materials as a result of the progressive …
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Development of Protocols and Methods for Predicting the Remaining Economic Life of Wastewater Pipe Infrastructure Assets
… modeling is a crucial step in assessing the remaining service life of pipelines. Sound infrastructure deterioration models are essential for accurately predicting future performance that, in turn, are critical tools for efficient maintenance, repair and rehabilitation decision making. The …
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Nondestructive damage characterization of concrete and concrete-steel composites using contactless ultrasonic scanning
… as bridges and nuclear power plants. During its service life, concrete and concrete-steel composite structures are subject to various deterioration mechanisms including freezing/thawing cycles, alkali-silica reaction (ASR) and sulfate attack. Prolonged and repeated exposure to the mechanisms can …
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Mechanistic-Empirical Evaluation of Pavement Damage and Cost Attributed to Overweight Single-Trip and Multi-Trip Scenarios in Nevada
… of zero dollars.In the calculation of PDAC, the remaining service life (RSL) of the pavement wasconsidered, a RSL of one representing a new pavement section. The RSL is a directmultiplier of PDAC and it is used to consider the current condition of the pavement at thetime of the move. …
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Review of current asset maintenance in South African ports and recommendations for smart port maintenance
… terms of their exposure conditions, durability, service life prediction and effective tests to assess chloride induced deterioration. The benefits of smart port maintenance technology are explored using case studies from international ports such as the Hamburg Port Authority (HPA) in Germany and …
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Accelerated Construction of Roadways: Life Cycle Assessment and Environmental Impacts
… and social equity. This study focuses on the life cycle assessment (LCA) of arterial improvement projects. Preservation treatments help in extending the remaining service life of roads; but at the same time, they may have substantial environmental impacts due to the acquisition of raw …
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Reliability based live loads for structural assessment of bridges on heavy-haul railway lines
… weak dependence than to traffic growth over the remaining service life of 50 years. The increase in return levels of load effects is less than 1% for traffic volume growth of 4% over a period of 50 years in contrast to the much higher values between 6% and 9% reported on highway bridges for 3% …