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 “"Deterioration Model"”.
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Deterioration Model for Ports in the Republic of Korea using Markov Chain Monte Carlo with Multiple Imputation
… over time as it gets older. It is the deterioration model that predicts how and when facilities will deteriorate over time. In most infrastructure management system, the deterioration model is a crucial element. Using the deterioration model, it is very helpful to estimate when repair …
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Corrosion rates and the time to cracking of chloride contaminated reinforced concrete bridge components
… existing bridges, Bridge Management Systems use models to predict the time when damage will reach a level to cause repair, rehabilitation, or replacement of the structure. One such model is the deterioration model, which has three distinct phases. The second phase of the model, the corrosion …
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Maintenance-based design of concrete parking structures
… produce the maximum economic benefit. Existing models for concrete deterioration are analyzed for their accuracy in predicting the service lives of concrete structures and a model appropriate for concrete parking structures is selected. The selected model is modified to account for the unique …
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Investigation of deterioration models for stormwater pipe systems
… in terms of pipe collapses due to structural deterioration or pipe blockages due to hydraulic deterioration. The deterioration of service infrastructure was a concern in Australian in recent times, where stormwater drainage pipes in Australia were rated as ‘poor condition’. The information on …
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Development of Protocols and Methods for Predicting the Remaining Economic Life of Wastewater Pipe Infrastructure Assets
Performance prediction 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 …
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Service life determination of concrete bridge decks and bridge deck overlay systems
… steel is one of the major causes of the deterioration of concrete bridge decks. Numerous bridge deck protection and overlay systems have been developed to reduce the deterioration rate caused by chloride-induced corrosion. This study investigated the service life of untreated concrete …
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Improving network pavement performance management using machine learning
… of sound network pavement performance models and optimization approaches to select appropriate maintenance and rehabilitation (M&R) strategies for pavement performance management at the network-level. A key challenge to apply the current pavement performance models to network-level …
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Development of a Novel Performance Index and a Performance Prediction Model for Metallic Drinking Water Pipelines
… types of water pipe condition and failure models using the various methodologies available. Contrary, current utilities are struggling to maintain their current water infrastructure system, due to the lack of effective prediction tools at hand. The gap between the methodologies available in …
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Network-level maintenance decisions for flexible pavement using a soft computing-based framework
… The result showed a good correlation for fuzzy model. A sensitivity analysis showed a pavement crack has the greatest influence on section classification compared to the other distress types. A novel network level deterministic deterioration model was developed for flexible pavement on arterial …
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An integrated performance model learning and planning approach for optimal infrastructure facility maintenance under partial observability
… infrastructure facilities under performance model uncertainty and partially observable condition state. Joint inspection and maintenance decision making refers to the cost-effective policies that capture the interactions between the inspections, and the maintenance and rehabilitation …
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Case-based reasoning for modeling bridge deterioration
… bridges, is characterized by their growing deterioration rate. Increased traffic loads, severity of environmental conditions, and deferred maintenance decisions are the main reasons for this rapid deterioration. Transportation agencies have developed Bridge Management Systems (BMS's) to …
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Development of Enhanced Pavement Deterioration Curves
Modeling pavement deterioration and predicting the pavement performance is crucial for optimum pavement network management. Currently only a few models exist that incorporate the structural capacity of the pavements into deterioration modeling. This thesis develops pavement deterioration models …
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Modelling the Flushing Mechanism of Thin Flexible Surface Pavements
… the research aimed to develop a pavement deterioration model to predict the initiation and progression of flushing on chip seal pavements. Mechanical testing was conducted on cores obtained from in-service, flushed chip seal pavements from Auckland, Waikato, Christchurch and Dunedin …
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The Application of Doppler LIDAR Technology for Rail Inspection and Track Geometry Assessment
… by the LIDAR sensors. A phenomenological rail deterioration model is developed to predict the future degradation of geometry quality over the short track segments. The introduced LIDAR's TQI is considered as the condition-parameter, and an internal variable is assumed to govern the rail …
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A Mechanistic Analysis Based Decision Support System for Scheduling Optimal Pipeline Replacement
… the pipe. In this research, a mechanistic model for assessing the stage of deterioration of an underground pipe is developed. The developed model consists of three sub-models namely, the Pipe Load Model (PLM), the Pipe Deterioration Model (PDM), and the Pipe Break Model (PBM). The PLM …
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Development of structural condition thresholds for TSD measurements
… In order to develop deflection thresholds, a model that related the pavement surface condition to pavement surface age and structural condition was developed. Structural condition thresholds were then selected so that the pavement surface condition predicted from the model for a 10-year-old …
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Probabilistic deterioration modelling and time-dependent reliability analysis of coastal defences
… prediction of coastal flood defence performance deterioration in the future plays an essential role in the reliability analysis and management process of these structures. The climate change effects and sea level rise will increase the hydraulic loads and frequency of the future extreme events, …