Remaining Service Life Estimation and Probabilistic Analysis of Reinforced Concrete Sewer Pipeline Systems PDF Download
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Author: Pardis Moamaei
Publisher:
ISBN:
Category :
Languages : en
Pages : 107
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Book Description
The serviceability and structural performance of reinforced concrete pipes could deteriorate for many reasons. The loss in structural capacity and other structural operations may drastically affect the surrounding environment, public health and the economy. This research is directed towards the estimation of remaining service life, and to evaluate the level of risk of failure of reinforced concrete sewer pipes (RCSP) that are subjected to continuing corrosion due to sulfide attack that in turn leads to loss of pipe thickness caused by excessive deterioration along the pipe's interior wall. In order to estimate the remaining service life, reliability theory is used by applying concrete cover limit state function, and time-dependent parameters are used to calculate the probability of the pipeline exceeding its given service life. Herein, the predicted service life is defined as the time at which the probability of exceedance is equal to 10%, which was selected based on engineering judgement.The presented methodology has been done to a sample of 16 RC pipes located in Houston,Texas, USA. Pipes are in different situation; some of these pipes are slightly deteriorated and have expected service life greater than 150 years; while others are severely eroded, with a predicted service life of 20 years or less.
Author: Pardis Moamaei
Publisher:
ISBN:
Category :
Languages : en
Pages : 107
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Book Description
The serviceability and structural performance of reinforced concrete pipes could deteriorate for many reasons. The loss in structural capacity and other structural operations may drastically affect the surrounding environment, public health and the economy. This research is directed towards the estimation of remaining service life, and to evaluate the level of risk of failure of reinforced concrete sewer pipes (RCSP) that are subjected to continuing corrosion due to sulfide attack that in turn leads to loss of pipe thickness caused by excessive deterioration along the pipe's interior wall. In order to estimate the remaining service life, reliability theory is used by applying concrete cover limit state function, and time-dependent parameters are used to calculate the probability of the pipeline exceeding its given service life. Herein, the predicted service life is defined as the time at which the probability of exceedance is equal to 10%, which was selected based on engineering judgement.The presented methodology has been done to a sample of 16 RC pipes located in Houston,Texas, USA. Pipes are in different situation; some of these pipes are slightly deteriorated and have expected service life greater than 150 years; while others are severely eroded, with a predicted service life of 20 years or less.
Author: Khaled Saleh Abuhishmeh
Publisher:
ISBN:
Category :
Languages : en
Pages : 165
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Book Description
Reinforced concrete pipes are susceptible to different types of deteriorations that threaten their structural capacity and serviceability. Failure of these structures or losing parts of their operational capabilities may cause undesirable consequences that affect the surrounding environment, public health and the economy. The main objectives of this research are to estimate the service life, and to evaluate the level of risk of reinforced concrete sewer pipes (RCP) that are under persistent chemical deterioration caused by the sulfide attack that leads to excessive erosion along the pipe's interior wall. In order to estimate the service life, reliability theory is used by implementing concrete cover limit state function, and the probability of exceedance is calculated as a time-dependent parameter. Herein, the predicted service life is defined as the time at which the probability of exceedance is equal to 10%, choosing this probability is based on engineering judgment. Regarding risk level, a simple product of the probability of exceedance and the consequences of failure is used; risk is considered in a qualitative context in this work.The proposed methodology has been applied to a sample of 30 RC pipes located in Arlington, Texas, USA. Pipes are in different conditions; some of these pipes have insignificant erosion and have expected service life greater than 120 years, however, other pipes are in severe condition and with a predicted service life of 60 years or less.
Author: Soroush Zamanian
Publisher:
ISBN:
Category :
Languages : en
Pages : 108
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Book Description
Deterioration in wastewater infrastructure systems is recognized as a serious, worldwide concern. Deterioration due to sulfate attack is one of the primary reasons of functional and structural failures in concrete sewer pipes which is a significant component in wastewater infrastructure systems. Any type of failure may lead to serious health, environmental, and economical issues, lack of the wastewater services, incidents, and traffic delays. The deterioration model presented by Environmental Protection Agency (EPA) is used to obtain the corrosion rate. Subsequently, a time-dependent model is utilized to determine the loss of wall thickness in concrete pipes. In this study, ANSYS is used to construct a nonlinear three-dimensional Finite Element model, which is capable of simulating the behavior of buried concrete sewer pipes under gravity and truck loads. Deterioration of concrete pipe is modeled in ANSYS in such a way that a continuous degradation of the system is considered during the service life of the pipes. A Monte Carlo-based reliability assessment method that uses Latin Hypercube Sampling technique is employed to capture the uncertainties associated with concrete and soil characteristics. The crack width which is the primary reason for leakage in the concrete pipes, is defined as the limit state function, and can be obtained from the tensile stresses on the pipe wall. Hence, the descending portion of stress-strain curve of concrete on the tension side is studied through post-processing of ANSYS results. The results indicate the significant impact of moderate deterioration on the performance and probability of failure of concrete sewer pipes for the serviceability level. In addition, elastic modulus of sidefill and bedding soil are found to have considerable effect on the stress distribution along the deteriorated concrete pipe.
Author: Mojtaba Mahmoodian
Publisher: Gulf Professional Publishing
ISBN: 0128135794
Category : Science
Languages : en
Pages : 188
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Book Description
Reliability and Maintainability of In-Service Pipelines helps engineers understand the best structural analysis methods and more accurately predict the life of their pipeline assets. Expanded to cover real case studies from oil and gas, sewer and water pipes, this reference also explains inline inspection and how the practice influences reliability analysis, along with various reliability models beyond the well-known Monte Carlo method. Encompassing both numerical and analytical methods in structural reliability analysis, this book gives engineers a stronger point of reference covering both pipeline maintenance and monitoring techniques in a single resource. Provides tactics on cost-effective pipeline integrity management decisions and strategy for a variety of different pipes Presents readers with rational tools for strengthening and rehabing existing pipelines Teaches how to optimize materials selection and design parameters for designing future pipelines with a longer service life
Author: Robby Caspeele
Publisher: CRC Press
ISBN: 1351857568
Category : Technology & Engineering
Languages : en
Pages : 5111
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Book Description
This volume contains the papers presented at IALCCE2018, the Sixth International Symposium on Life-Cycle Civil Engineering (IALCCE2018), held in Ghent, Belgium, October 28-31, 2018. It consists of a book of extended abstracts and a USB device with full papers including the Fazlur R. Khan lecture, 8 keynote lectures, and 390 technical papers from all over the world. Contributions relate to design, inspection, assessment, maintenance or optimization in the framework of life-cycle analysis of civil engineering structures and infrastructure systems. Life-cycle aspects that are developed and discussed range from structural safety and durability to sustainability, serviceability, robustness and resilience. Applications relate to buildings, bridges and viaducts, highways and runways, tunnels and underground structures, off-shore and marine structures, dams and hydraulic structures, prefabricated design, infrastructure systems, etc. During the IALCCE2018 conference a particular focus is put on the cross-fertilization between different sub-areas of expertise and the development of an overall vision for life-cycle analysis in civil engineering. The aim of the editors is to provide a valuable source of cutting edge information for anyone interested in life-cycle analysis and assessment in civil engineering, including researchers, practising engineers, consultants, contractors, decision makers and representatives from local authorities.
Author: American Society of Civil Engineers
Publisher:
ISBN:
Category : Civil engineering
Languages : en
Pages : 944
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Book Description
Vols. 29-30 contain papers of the International Engineering Congress, Chicago, 1893; v. 54, pts. A-F, papers of the International Engineering Congress, St. Louis, 1904.
Author: M. Farley
Publisher: IWA Publishing
ISBN: 1900222116
Category : Science
Languages : en
Pages : 297
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Book Description
This is a best practice manual for addressing water losses in water distribution networks worldwide. Systems and methodologies are presented for improving water loss and leakage management in a range of networks, from systems with a well-developed infrastructure to those in developing countries where the network may need to be upgraded. The key feature of the manual is a diagnostic approach to develop a water loss strategy - using the appropriate tools to find the right solutions - which can be applied to any network. The methods of assessing the scale and volume of water loss are outlined, together with the procedures for setting up leakage monitoring and detection systems. As well as real losses (leakage) procedures for addressing apparent losses, by introducing regulatory and customer metering policies are explained. Suggestions are made for demand management and water conservation programmes, to complement the water loss strategy. Recommendations are made for training workshops and operation and maintenance programmes to ensure skills transfer and sustainability. The manual is illustrated throughout with case studies. Losses in Water Distribution Networks will appeal to a wide range of practitioners responsible for designing and managing a water loss strategy. These include consultants, operations managers, engineers, technicians and operational staff. It will also be a valuable reference for senior managers and decision makers, who may require an overview of the principles and procedures for controlling losses. The book will also be suitable as a source document for courses in Water Engineering, Resource Management and Environmental Management.
Author: Christiane Maierhofer
Publisher: Woodhead Publishing
ISBN: 9780081014639
Category : Technology & Engineering
Languages : en
Pages : 266
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Book Description
This authoritative book provides a comprehensive review of the highly important subject of non-destructive evaluation of reinforced concrete structures. Engineers have a range of sophisticated techniques at their disposal to assess the condition of reinforced concrete structures that do not cause material damage and which usually enable the structure to be used while the surveys are carried out. Non-destructive evaluation of the infrastructure also plays a key role in calculating and prioritising where money should be spent on repair or replacement. Providing details of related techniques and case studies, this book offers an overview of how to plan and implement the NDT of reinforced concrete structures.
Author: Mohammad Najafi
Publisher:
ISBN:
Category : Culverts
Languages : en
Pages : 308
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Book Description
Drainage infrastructure systems (culvert, storm sewer, outfall and related drainage elements) are mostly buried underground and are in need of special attention in terms of proactive/preventive asset management strategy. Drainage infrastructure systems represent an integral portion of roadway assets that routinely require inspection, maintenance, repair and renewal. Further challenges are the wide geospatial distribution of these infrastructure assets and environmental exposure. There has been considerable research conducted on culverts, but mostly looked at the problem from a traditional structural/geotechnical perspective. Asset management procedures for culverts and drainage infrastructure systems are complex issues, and can benefit a great deal from an optimal asset management program that draws from programs pertaining to buried pipes. The first and most important step in an asset management initiative is the establishment of mechanism for asset inventory and asset conditions in a format compatible with the routine procedures of field operators and inspectors. The first objective of this research project was to develop field protocols and operational business rules for inventory data collection and management and inspection of drainage infrastructures in terms of types of data to be collected, frequency of inspection, and analysis and reporting mechanisms. After review of these protocols by the project oversight committee, a pilot study was conducted to verify efficiency of their implementation. The condition assessment protocol introduced is useful in evaluating the overall condition of culverts and can be used for decision making regarding the repair, renewal or replacement of culverts. For the second objective of this project, investigators examined the inventory and inspection protocols employed by Ohio Department of Transportation (ODOT) and developed a decision support platform, which establishes a link between the inspection results and appropriate repair, renewal and replacement procedures. After applying the recommended procedures, the transportation agencies can better track the conditions of culverts thereby reducing the risks of culvert failures.
Author: American Society of Civil Engineers
Publisher: Amer Society of Civil Engineers
ISBN: 9780784411872
Category : Technology & Engineering
Languages : en
Pages : 1500
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Book Description
Proceedings of the Pipelines 2011 Conference, held in Seattle, Washington, July 23-27, 2011. Sponsored by the Pipeline Division of ASCE. This collection contains 135 peer-reviewed technical papers that discuss new solutions to some of the most critical infrastructure issues involving pipelines. The U.S. water and wastewater infrastructure systems are continuing to deteriorate. The recent economic downturn has increased the gap between current and required levels of funding. These serious financial constraints highlight the urgent need for creative and innovative solutions to improve our water and wastewater infrastructure systems. From the technical perspective, cost effective materials, proper planning, new design methods, innovative construction technologies, and advanced condition assessment technologies must be more aggressively developed, tested, and introduced to the industry. From the management perspective, optimal use of financial resources, smart and carefully crafted decision making processes on maintenance, rehabilitation and replacement activities must be made available, applied by and used by water and wastewater infrastructure agencies.
