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Author : Thomas James Hadzor
Publisher :
ISBN 13 :
Total Pages : 182 pages
Book Rating : 4.:/5 (73 download)
Download or read book Acoustic Emission Testing of Repaired Prestressed Concrete Bridge Girders written by Thomas James Hadzor and published by . This book was released on 2011 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Robert Lee Worley (II)
Publisher :
ISBN 13 :
Total Pages : 266 pages
Book Rating : 4.:/5 (18 download)
Download or read book Acoustic Emission Sensing for Crack Monitoring in Prefabricated and Prestressed Reinforced Concrete Bridge Girders written by Robert Lee Worley (II) and published by . This book was released on 2019 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt: Prefabricated and pre-stressed reinforced concrete beams and girders are integral components of many highway structures, including those built by rapid construction techniques. Concerns exist regarding the development of cracks during curing, form removal, detensioning, transport, installation, and operation. Non-destructive, Acoustic Emission (AE) sensing techniques have the potential for detecting and locating cracking in prefabricated, pre-stressed concrete girders used as Prefabricated Bridge Elements and Systems (PBES) used in rapid construction practices as part of a Quality Assurance/Quality Control (QA/QC) program. AE sensing records transient elastic waves produced by the release of stored elastic energy resulting in plastic deformations (i.e., crack nucleation and growth) with an array of point sensors. The AE instrument system is relatively portable which can allow for it to be an option for both off-site fabrication QA/QC as well as on-site field QA/QC. This thesis presents a multi-stage research initiative on acoustic emission monitoring of prefabricated and pre-stressed reinforced concrete beams used in highway bridge construction during detensioning, craned removal from formwork and transport to bridge sites, along with supporting laboratory tests and numerical analysis. The specific objectives of this research were to: 1. Identify suitable instruments to monitor pre-stressed and/or post-tensioned concrete girders for cracking activity; 2. Design and develop a reusable instrumentation package; 3. Measure performance and condition of concrete girders during fabrication and transport; and 4. Identify test protocols and possible accept/fix/reject criteria for structural elements based on information from monitoring system. Presented are results from laboratory, full-scale girder fabrication, and transport monitoring, along with overall conclusions and recommendations for future research.
Author : B. V. Tinkey
Publisher :
ISBN 13 :
Total Pages : 112 pages
Book Rating : 4.:/5 (1 download)
Download or read book Nondestructive Testing of Prestressed Bridge Girders with Distributed Damage written by B. V. Tinkey and published by . This book was released on 2002 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Steven C. Lovejoy
Publisher :
ISBN 13 :
Total Pages : 24 pages
Book Rating : 4.:/5 (352 download)
Download or read book Acoustic Emission Testing of In-service Conventionally Reinforced Concrete Deck Girder Superstructures on Highway Bridges written by Steven C. Lovejoy and published by . This book was released on 2008 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: Three reports were produced from research sponsored by the Oregon Department of Transportation on acoustic emission (AE). The first describes the evaluation of AE techniques applied to two reinforced concrete (RC) bridge girders, which were loaded to mimic in-service conditions. The main goal was to get a thorough understanding of how AE methods can be used with RC and in what way these methods can assist in maintaining the states aging RC deck girder bridges. Recommended settings for data acquisition and processing were evaluated. In addition to the complex full-scale beam components, studies were performed on smaller test specimens that improved understanding of stress wave propagation through reinforced concrete and the response of acoustic emission sensors in detecting these waves. Some qualitative and quantitative assessment methodologies were described, and examples and limitations of the methods were presented. Source locations in three dimensions were performed, and strategies on how to best deploy sensors were evaluated using Monte Carlo Simulations.
Author : Piya Chotickai
Publisher :
ISBN 13 :
Total Pages : 410 pages
Book Rating : 4.:/5 (472 download)
Download or read book Acoustic emission monitoring of prestressed bridge girders with premature concrete deterioration written by Piya Chotickai and published by . This book was released on 2001 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Luis Octavio Yepez Roca
Publisher :
ISBN 13 :
Total Pages : 192 pages
Book Rating : 4.:/5 (38 download)
Download or read book Acoustic emission examination of high strength prestressed concrete girders written by Luis Octavio Yepez Roca and published by . This book was released on 1997 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Rubik Babakanian
Publisher :
ISBN 13 :
Total Pages : 200 pages
Book Rating : 4.:/5 (166 download)
Download or read book Development of Techniques for Acoustic Emission Testing of Prestressed Concrete written by Rubik Babakanian and published by . This book was released on 1985 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Fernando Pacheco-Torgal
Publisher : Elsevier
ISBN 13 : 0443134715
Total Pages : 457 pages
Book Rating : 4.4/5 (431 download)
Download or read book Eco-efficient Repair and Rehabilitation of Concrete Infrastructures written by Fernando Pacheco-Torgal and published by Elsevier. This book was released on 2024-03-22 with total page 457 pages. Available in PDF, EPUB and Kindle. Book excerpt: Eco-efficient Repair and Rehabilitation of Concrete Infrastructures, Second Edition provides an updated state-of-the-art review on the latest advances in this important research field. The first section is brought fully up-to-date and focuses on deterioration assessment methods. Section two contains brand new chapters on innovative concrete repair and rehabilitation materials including: fly ash-based alkali-activated repair materials for concrete exposed to aggressive environments; repairing concrete structures with alkali-activated metakaolin mortars; concrete with micro encapsulated self-healing materials; concrete repaired with bacteria; concrete structures repaired with engineered cementitious composites; concrete repaired by electrodeposition; the assessment of concrete after repair operations and durability of concrete repair. The final section has also been amended to include six new chapters on design, Life-cycle cost analysis and life-cycle assessment. These chapters include maintenance strategies for concrete structures; a comparison of different repair methods; life cycle assessment of the effects of climate change on bridge deterioration; life-cycle-cost benefits of cathodic protection of concrete structures; life-cycle cost analyses for concrete bridges exposed to chlorides and life-cycle analysis of repair of concrete pavements. The book will be an essential reference resource for materials scientists, civil and structural engineers, architects, structural designers and contractors working in the construction industry. Covers the latest research findings on eco-efficient repair and rehabilitation of concrete infrastructures Provides comprehensive coverage from damage detection and assessment, to repair strategies and structural health monitoring Presents a diverse author base that offers insights on construction practice and employed technologies worldwide Includes an entire section on NDT, innovative repair, and rehabilitation materials, as well as case studies on lifecycle cost analysis and lifecycle assessment
Author : Steven C. Lovejoy
Publisher :
ISBN 13 :
Total Pages : 1068 pages
Book Rating : 4.:/5 (78 download)
Download or read book Development of Acoustic Emissions Testing Procedures Applicable to Conventionally Reinforced Concrete Deck Girder Bridges Subjected to Diagonal Tension Cracking written by Steven C. Lovejoy and published by . This book was released on 2006 with total page 1068 pages. Available in PDF, EPUB and Kindle. Book excerpt: A need exists to develop a non-destructive testing technique that can identify the formation and propagation of diagonal tension cracks in conventionally steel reinforced concrete deck girder (RCDG) highway bridges in the State of Oregon. Such a technique could be included into a structural health monitoring (SHM) system installed on specific bridges to automatically monitor the current state of structural damage in primary load supporting elements and provide notification of recent damage to bridge engineers in nearly real time. This research investigates the practical application of AE used to supplement a conventional SHM on vintage RCDG bridges. Background work presented in the Appendices investigates stress wave propagation in non-reinforced and steel reinforced concrete media. Based on the characterization of stress wave speeds, amplitude attenuation, frequency content and wave forms found in concrete media, testing methods are developed and applied to 31 full sized RCDG test specimens that include variations in loading, load capacity and structural detailing. Several different AE test procedures are used to characterize the damage states of the test beams as they are progressively loaded to failure. Four previously developed AE parameters that characterize both damage progression and damage state are applied which include the Felicity and Calm Ratios, Severity and the Historic Index. Both Felicity and Calm Ratios were found to respond to the damage state of the test beam as determined from more conventional assessment methods such as crack width and load. For the practical in-service loading ranges of 20 to 80% of ultimate capacity both the Felicity and Calm Ratios were found to respond in a nearly linear manner with increasing damage. Three categories of damage state are defined which are based on the ODOT crack comparator tool which is used for in-service maintenance inspections of these bridges. Felicity and Calm Ratio values are related to these damage states for the specific type of bridge girders being tested and can be used to estimate in-service damage states. The Severity and Historic Index responses were found to be an effective means of identifying the formation and extension of diagonal tension cracks as they developed. Threshold levels for these two parameters are identified for specific AE sensor types when applied to this class of bridge girder. A preliminary set of AE testing and analysis procedures were developed that were applied to three in-service bridges. These bridge tests used both controlled and ambient loading protocols. The structural response to each load case was quantified by using both crack width motion and reinforcing steel strain range. These structural parameters were correlated with the AE data. The Calm Ratio was found to be of practical importance and that the values recorded were in reasonably good agreement with the laboratory data once the imposed loads and current crack widths were considered. The Severity and Historic Index were also found to be of practical importance to bridge testing and structural health monitoring as they were found to be very sensitive to increasing damage, yet exhibit good stability provided enough AE activity was present. A recommend set of guidelines and practices for applying AE to vintage RCDG bridges is developed and presented.
Author : Malgorzata Kalicka
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (82 download)
Download or read book Long Term Monitoring of a Prestressed Concrete Box Girder Bridge by Acoustic Emission - Planning and Executing written by Malgorzata Kalicka and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Rubik Babakanian
Publisher :
ISBN 13 :
Total Pages : 200 pages
Book Rating : 4.:/5 (129 download)
Download or read book Acoustic Emissions Testing of Prestressed Concrete in an Accelerated State of Corrosion written by Rubik Babakanian and published by . This book was released on 1984 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Christian U. Grosse
Publisher : Springer Nature
ISBN 13 : 3030679365
Total Pages : 752 pages
Book Rating : 4.0/5 (36 download)
Download or read book Acoustic Emission Testing written by Christian U. Grosse and published by Springer Nature. This book was released on 2021-07-14 with total page 752 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides an introduction to Acoustic Emission Testing and its applications to different materials like concrete, steel, ceramics, geotechnical materials, polymers, biological structures and wood. Acoustic Emission Techniques (AET) techniques have been studied in engineering for a long time. The techniques are applied more and more to practical investigations and are more and more standardized in codes. This is because the degradation of structures due to ageing urgently demand for maintenance and rehabilitation of structures in service. It results in the need for the development of advanced and efficient inspection techniques. In mechanical engineering and concerning the monitoring of machines and mechanical components, AE is a widely accepted observing deterioration in the frame of structural health monitoring. The advantages of AE like sensitivity, damage localization potential, non-intrusive nature as well as developments in signal analysis and data transmission allow applications that could not be considered decades ago. As such, AE techniques draw great attention to diagnostic applications and in material testing. This book covers all levels from the description of AE basics for AE beginners (level of a student) to sophisticated AE algorithms and applications to real large-scale structures as well as the observation of the cracking process in laboratory specimen to study fracture processes. This book has proved its worth over the past twelve years. Now in its second edition, it will be a resource that sets the standard and equips readers for the future. All chapters from the 1st edition have been updated and rewritten and eight extra chapters (e.g also regarding AE tomography, AE in plate-like structures and AE for investigations of hardening of fresh concrete) have been added.
Author :
Publisher :
ISBN 13 :
Total Pages : 78 pages
Book Rating : 4.3/5 (91 download)
Download or read book FHWA Research, Development, and Technology Transfer. Biennial Report. 1986-1987 written by and published by . This book was released on 1988 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Archana Nair
Publisher : LAP Lambert Academic Publishing
ISBN 13 : 9783838309859
Total Pages : 92 pages
Book Rating : 4.3/5 (98 download)
Download or read book Acoustic Emission Evaluation of Rc Beams and Bridges written by Archana Nair and published by LAP Lambert Academic Publishing. This book was released on 2009-08 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: A considerable proportion of highway bridges in the US, are made of reinforced concrete. Since there is a need to detect and recuperate the condition of the bridge structures numerous innovative non-destructive testing (NDT) techniques have come into the forefront. Of the many available technologies, acoustic emission (AE) monitoring has been the most popular passive non-destructive technique used on highway bridges. Usually AE monitoring is used to obtain qualitative results by observing the trends of the conventional AE parameters recorded by the data acquisition system. In this book, damage is quantified by applying the intensity analysis technique to conventional AE parameters generated from reinforced concrete members subjected to certain loads.
Author : A.S. Nowak
Publisher : Springer Science & Business Media
ISBN 13 : 9400921535
Total Pages : 618 pages
Book Rating : 4.4/5 (9 download)
Download or read book Bridge Evaluation, Repair and Rehabilitation written by A.S. Nowak and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 618 pages. Available in PDF, EPUB and Kindle. Book excerpt: Evaluation, repair and rehabilitation of bridges are increasingly important topics in the effort to deal with the deteriorating infrastructure. For example, in the United States about 40 percent of the nation's 570,000 bridges are classified, according to the Federal Highway Administra tion's (FHW A) criteria, as deficient and in need of rehabilitation and replacement. In other countries the situation is similar. FHW A estimates the cost of a bridge replacement and reha bilitation program at 50 billion dollars. The major factors that have contributed to the present situation are: the age, inadequate maintenance, increasing load spectra and environmental contamination. The deficient bridges are posted, repaired or replaced. The disposition of bridges involves clear economical and safety implications. To avoid high costs of replacement or repair, the evaluation must accurately reveal the present load carrying capacity of the struc ture and predict loads and any further changes in the capacity (deterioration) in the applicable time span. Accuracy of bridge evaluation can be improved by using the recent developments in bridge diagnostics, structural tests, material tests, structural analysis and probabilistic methods. There is a need for an international exchange of advanced experience to increase the research effi ciency. The Workshop is organized on the premise that the exchange of existing American and European experience in the area of bridge evaluation, repair and rehabilitation is beneficial for both parties involved.
Author :
Publisher :
ISBN 13 :
Total Pages : 838 pages
Book Rating : 4.3/5 (555 download)
Download or read book Federally Coordinated Program of Highway Research, Development and Technology written by and published by . This book was released on 1983 with total page 838 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Malgorzata Kalicka
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (778 download)
Download or read book Acoustic Emission as a Monitoring Method in Prestressed Concrete Bridges Health Condition Evaluation written by Malgorzata Kalicka and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
