Evaluation Of External Post Tensioned Tendons Using Vibration Signatures
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Evaluation Of External Post Tensioned Tendons Using Vibration Signatures
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Author : Jun Ki Lee
language : en
Publisher:
Release Date : 2007
Evaluation Of External Post Tensioned Tendons Using Vibration Signatures written by Jun Ki Lee and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with Cables categories.
Recent findings regarding corrosion of post-tensioned bridges have highlighted the urgent need to develop reliable methods to predict the behavior of the structural system after damage has occurred and inspection techniques to assess the condition of the structure. Corrosion in strands is undesirable in that it often progresses without visual signs of distress, but may cause a brittle failure. To complicate the inspection, access to the strands for visual inspection is usually blocked by the concrete cross section. To date, significant efforts have been taken to improve the durability of the post-tensioned bridges. However, the behavior of the post-tensioned bridges with corrosion damage is not clearly understood and the currently available inspection techniques tend to provide only limited information about the nature and extent of the damage. The research project discussed in this dissertation was developed is to evaluate the feasibility of using the vibration technique to detect and estimate the extent of damage in an external tendon due to corrosion. To accomplish this goal, damage was induced in five specimens, which were monitored periodically to correlate the measured changes in the frequency response to the level of damage. The induced damage simulated the degradation of a post-tensioned structure from corrosion. This dissertation describes the experimental program and the numerical scheme used to estimate the condition of the specimens. Three types of specimens were tested during the experimental phase of the research: individual strands, cables specimens, and external tendons. A series of tension tests of individual strands were conducted to investigate changes in the uniaxial behavior after damage was induced. Simulated damage included uniform corrosion of the strand, mechanical wire cuts, and an initial defect in one wire. Three cable specimens and one tendon specimen were subjected to fatigue loading. The loading was selected to simulate the loss of cross-sectional area in the strands, and also caused grout damage. The frequency response of the specimens was recorded periodically during the fatigue tests and acoustic sensors were used to detect the occurrence of wire breaks. A second tendon specimen was exposed to an acid solution to simulate the hydrogen induced cracking in the strand at three different locations along the length of the specimen. A number of wires fractured during the exposure test and damage was inspected visually. Natural frequencies were also measured periodically. The residual prestressing force in of the specimens was extracted from the measured natural frequencies. The stiff string model was used to determine optimum values of tension and flexural stiffness from the frequency response. The numerical results from this optimization demonstrated the feasibility of using the vibration technique as a nondestructive testing method for external tendons.
Bending Fatigue Response Of Grouted Stay Cables
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Author :
language : en
Publisher:
Release Date : 2008
Bending Fatigue Response Of Grouted Stay Cables written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with Bridges categories.
Materials Evaluation
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Author :
language : en
Publisher:
Release Date : 2006
Materials Evaluation written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with Nondestructive testing categories.
Gestion Des Ponts En B Ton Pr Contraint Par Post Tension Inject S Au Coulis De Ciment
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Author : PIARC Committee on Road Bridges
language : en
Publisher:
Release Date : 2000
Gestion Des Ponts En B Ton Pr Contraint Par Post Tension Inject S Au Coulis De Ciment written by PIARC Committee on Road Bridges and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with Bridges categories.
Inspection And Maintenance Of Bridge Stay Cable Systems
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Author : Habib Tabatabai
language : en
Publisher: Transportation Research Board
Release Date : 2005
Inspection And Maintenance Of Bridge Stay Cable Systems written by Habib Tabatabai and has been published by Transportation Research Board this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Technology & Engineering categories.
TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 353: Inspection and Maintenance of Bridge Stay Cable Systems identifies and explains various inspection and maintenance techniques for bridge stay cable systems. It discusses both short- and long-term approaches. The report information on methods for inspections and assessments, including nondestructive testing and evaluation procedures; repair and retrofit; methods for control of cable vibrations, including rainwind vibrations; stay cable fatigue and failure; effectiveness of various inspection and repair methods; limitations of available technologies; and trends and recommendations for future study.
Bridge Maintenance Safety Management Life Cycle Performance And Cost
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Author : Paulo J. S. Cruz
language : en
Publisher: Taylor & Francis Group
Release Date : 2006
Bridge Maintenance Safety Management Life Cycle Performance And Cost written by Paulo J. S. Cruz and has been published by Taylor & Francis Group this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with Technology & Engineering categories.
With contributions from leading experts, this book addresses all major aspects of bridge maintenance, safety, and management and delineates the state of the art in bridge maintenance and safety. It offers advice for decision making in bridge maintenance, safety, management, and cost for the purpose of enhancing the welfare of society. Topics include deterioration modeling, emerging technologies, field testing, financial planning, health monitoring, high-performance materials, innovations, load capacity assessment, maintenance strategies, new technology and materials, nondestructive testing, future traffic demands, reliability and risk, sustainable materials, whole-life costing, and more.
Recent Advances In Structural Engineering Volume 1
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Author : A. Rama Mohan Rao
language : en
Publisher: Springer
Release Date : 2018-08-01
Recent Advances In Structural Engineering Volume 1 written by A. Rama Mohan Rao and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-08-01 with Science categories.
This book is a collection of select papers presented at the Tenth Structural Engineering Convention 2016 (SEC-2016). It comprises plenary, invited, and contributory papers covering numerous applications from a wide spectrum of areas related to structural engineering. It presents contributions by academics, researchers, and practicing structural engineers addressing analysis and design of concrete and steel structures, computational structural mechanics, new building materials for sustainable construction, mitigation of structures against natural hazards, structural health monitoring, wind and earthquake engineering, vibration control and smart structures, condition assessment and performance evaluation, repair, rehabilitation and retrofit of structures. Also covering advances in construction techniques/ practices, behavior of structures under blast/impact loading, fatigue and fracture, composite materials and structures, and structures for non-conventional energy (wind and solar), it will serve as a valuable resource for researchers, students and practicing engineers alike.
Seismic Interferometry
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Author : Deyan Draganov
language : en
Publisher: SEG Books
Release Date : 2008
Seismic Interferometry written by Deyan Draganov and has been published by SEG Books this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with Nature categories.
Including more than 70 papers, this invaluable source for researchers and students contains an editors' introduction with extensive references and chapters on seismic interferometry without equations, highlights of the history of seismic interferometry from 1968 until 2003, and offers a detailed overview of the rapid developments since 2004.
Infrared Thermography Recent Advances And Future Trends
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Author : Carosena Meola
language : en
Publisher: Bentham Science Publishers
Release Date : 2012-08-03
Infrared Thermography Recent Advances And Future Trends written by Carosena Meola and has been published by Bentham Science Publishers this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-08-03 with Technology & Engineering categories.
Infrared thermography (IRT) is a non-contact, non-invasive methodology which allows for detection of thermal energy that is radiated from objects in the infrared band of the electromagnetic spectrum, for conversion of such energy into a visible image (such as a surface temperature map). This feature represents a great potential to be exploited in a vast variety of fields from aerospace to civil engineering, to medicine, to agriculture, etc. However, IRT is still not adequately enclosed in industrial instrumentation and there are still potential users who might benefit from the use of such a technique and who are not aware of their existence. This e-book conveys information about basic IRT theory, infrared detectors, signal digitalization and applications of infrared thermography in many fields such as medicine, foodstuff conservation, fluid-dynamics, architecture, anthropology, condition monitoring, non destructive testing and evaluation of materials and structures. The volume promotes an exchange of information between the academic world and industry, and shares methodologies which were independently developed and applied in specific disciplines.
Human Response To Vibration
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Author : Neil J. Mansfield
language : en
Publisher: CRC Press
Release Date : 2004-10-28
Human Response To Vibration written by Neil J. Mansfield and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004-10-28 with Technology & Engineering categories.
Through continued collaboration and the sharing of ideas, data, and results, the international community of researchers and practitioners has developed an understanding of many facets of the human response to vibration. At a time when the EU is preparing to adopt a directive on health risks arising from occupational exposure to vibration, Human Response to Vibration offers authoritative guidance on this complex subject. Individual chapters in the book examine issues relating to whole-body vibration, hand-arm vibration, and motion sickness. Vibration measurements and standards are also addressed. This book meets the needs of those requiring knowledge of human response to vibration in order to make practical improvements to the physical working environment. Written with the consultant, practitioner, researcher, and student in mind, the text is designed to be an educational tool, a reference, and a stimulus for new ideas for the next generation of specialists.