Field Monitoring Of Scour Critical Bridges
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Field Monitoring Of Scour Critical Bridges
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Author : Xiong Yu
language : en
Publisher:
Release Date : 2010
Field Monitoring Of Scour Critical Bridges written by Xiong Yu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Detectors categories.
Scour is a major threat to the safety of bridges. Instruments for the measurement and monitoring of bridge scour are necessary to study scour processes and to support bridge management. The lack of robust and economical scour monitoring devices prevents the implementation of a bridge scour monitoring program among bridge owners. This project explores the design and analyses of scour sensors using principles of Time Domain Reflectometry (TDR). The performance of a scour probe was first tested in laboratory simulated scour experiments. Three different signal analyses methods were developed to obtain the scour depth from TDR signals. Besides scour depth, additional information related to scour assessment, i.e. sediment density and electrical conductivity of water, were also determined from TDR signals. The sensing principles and analysis algorithms were validated from simulated scour tests under various conditions which are expected to be encountered in the field. The field conditions considered included: variation of sediment types, water conductivity, turbidity, air entrapment, and water elevation. These further validated the robustness of the scour sensing principles. Upon validation, a field worthy sensor was designed. The sampling area and effective measured dielectric constant were determined using a finite element analysis method. Evaluation of the sensor indicated that it was able to successfully monitor the scour processes (scour and refill) in real-time with high accuracy. Six TDR bridge scour sensors were installed at BUT-122-0606 bridge on SR 122 over the Great Miami River in Butler County, with assistance of project partners GRL Engineers Inc., and J&L Laboratories. Automatic monitoring units were installed to automatically take scour sensor signals and wirelessly transmit the sensor data. The sensors were installed using routine geotechnical site investigation tools and procedures. High quality signals were obtained, from which the development of scour adjacent to bridge piers was measured. The results are reasonable. The pilot study points to the promise of this new technology for long term bridge scour monitoring purposes. Continued evaluation and refinement of this new scour monitoring sensor system is highly recommended.
Field Implementation And Evaluation Of The Simple Cost Effective Scour Sensor
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Author : Farhad Ansari
language : en
Publisher:
Release Date : 2011
Field Implementation And Evaluation Of The Simple Cost Effective Scour Sensor written by Farhad Ansari and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Detectors categories.
Stream Instability Bridge Scour And Countermeasures A Field Guide For Bridge Inspectors
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Author : Transportation Dept., Federal Highway Administration
language : en
Publisher: Government Printing Office
Release Date :
Stream Instability Bridge Scour And Countermeasures A Field Guide For Bridge Inspectors written by Transportation Dept., Federal Highway Administration and has been published by Government Printing Office this book supported file pdf, txt, epub, kindle and other format this book has been release on with Technology & Engineering categories.
FHWA Publication No. FHWA-NHI-08-0106. February 2009. Explains the behavior of rivers in order to recognize changing conditions associated with unstable streams or scour at bridge foundations that may threaten the stability of the bridge. Provides tips and guidance on what to look for with regard to both stream instability, including lateral instability, degradation, and aggradation, and scour at bridges, including contraction scour, pier scour, and abutment scour. Also covered are plans of action and countermeasures, such as monitoring, flood watches, bridge closures, and river training countermeasures.
Bridge Scour Monitoring Technologies
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Author : Matthew Lueker
language : en
Publisher:
Release Date : 2010
Bridge Scour Monitoring Technologies written by Matthew Lueker and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Bridges categories.
Bridge failure or loss of structural integrity can result from scour of riverbed sediment near bridge abutments or piers during high-flow events in rivers. In the past 20 years, several methods of monitoring bridge scour have been developed spanning a range of measurement approaches, complexities, costs, robustness, and measurement resolutions. This project brings together the expertise of Minnesota Department of Transportation (Mn/DOT) bridge engineers and researchers, university hydraulic and electrical engineers, field staff, and inspectors to take the first steps toward development of robust scour monitoring for Minnesota river bridges. The team worked with Mn/DOT engineers to identify variables of scour critical bridges that affect the application of scour monitoring technology. The research team will used this information to develop a Scour Monitoring Decision Framework (SMDF) that will aid Mn/DOT in selecting the best technologies for specific sites. The final component of the project will involve testing the SMDF on five bridges in a case-study type demonstration; work plans for two of the sites were developed for demonstration of deployed instrumentation.
Monitoring Scour Critical Bridges
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Author : Beatrice E. Hunt
language : en
Publisher: Transportation Research Board
Release Date : 2009
Monitoring Scour Critical Bridges written by Beatrice E. Hunt 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 2009 with Religion categories.
Bridge Scour Evaluation
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Author : John Kattell
language : en
Publisher:
Release Date : 1998
Bridge Scour Evaluation written by John Kattell and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Scour at bridges categories.
Portable Scour Monitoring Equipment
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Author : James Douglas Schall
language : en
Publisher: Transportation Research Board
Release Date : 2004
Portable Scour Monitoring Equipment written by James Douglas Schall 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 2004 with Scour (Hydraulic engineering) categories.
Introduction and research approach -- Findings -- Interpretation, appraisal, and applications -- Conclusions and suggested research -- References -- Appendixes.
Development And Verification Of Web Based Bridge Monitoring Interface
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Author : Jason Lloyd
language : en
Publisher:
Release Date : 2013-12-05
Development And Verification Of Web Based Bridge Monitoring Interface written by Jason Lloyd and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-12-05 with categories.
With the advancement of many off-the-shelf data acquisition systems readily available today and the availability of 3G and 4G high-speed wireless cellular networks, the potential for remote monitoring of critical bridges has never been better. Needs exist regarding scour and general structural response for long-term monitoring. However, short-term monitoring using quickly deployable, rugged systems are also desirable in cases where impact, fire, environmental effects, or other damage may occur. These robust systems can be deployed rapidly, and endure harsh elements, enabling DOTs to constantly assess and monitor a structure, or a network of structures. Hence, the objective of this project is to explore the feasibility and proof of concept of using a web-based bridge monitoring interface for use on selected INDOT bridges for both short-term and long-term applications. This report will focus on a single case study, the Virginia Ave Bridge over I-65 SB, a steel plate girder bridge that frequently falls victim to truck impact as a result of low clearance. This case study is uniquely different and provides insight into how targeted instrumentation systems can be used to probe specific parameters desired by owners for bridge condition assessment and monitoring. It will be shown how commercially available instrumentation systems can be tailored to fit any unique application required. Additionally, it will be demonstrated that INDOT benefited from this specific case of field-deployed, short-term monitoring, which included automated notifications of critical onsite conditions.
An Adaptive Field Detection Method For Bridge Scour Monitoring Using Motion Sensing Radio Transponders Rfids
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Author : A. N. (Thanos) Papanicolaou
language : en
Publisher:
Release Date : 2014
An Adaptive Field Detection Method For Bridge Scour Monitoring Using Motion Sensing Radio Transponders Rfids written by A. N. (Thanos) Papanicolaou and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with Scour at bridges categories.
A comprehensive field detection method is proposed that is aimed at developing advanced capability for reliable monitoring, inspection and life estimation of bridge infrastructure. The goal is to utilize Motion-Sensing Radio Transponders (RFIDs) on fully adaptive bridge monitoring to minimize the problems inherent in human inspections of bridges. We developed a novel integrated condition-based maintenance (CBM) framework integrating transformative research in RFID sensors and sensing architecture, for in-situ scour monitoring, state-of-the-art computationally efficient multiscale modeling for scour assessment.
Scour Monitoring Technology Implementation
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Author :
language : en
Publisher:
Release Date : 2014
Scour Monitoring Technology Implementation written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with Bridges categories.
Bridge scour is the removal of sediment around bridge foundations and can result in the failure of the bridge. Scour monitoring is performed to identify unacceptable scour on bridges considered to be scour critical and determine when scour reaches elevations that could cause potential bridge failure. Two types of monitoring are available: portable monitoring and fixed monitoring. Prior to this project, MnDOT was only using portable monitoring devices, which requires the deployment of personnel to make physical measurements of scour depths. For some scour critical bridges, especially during high-water events, fixed instrumentation capable of continuous scour monitoring was preferred, but MnDOT lacked the experience or expertise to install this type of equipment. This project installed fixed monitoring equipment at two bridge sites and monitored them for three years to determine the effectiveness and reliability of fixed scour monitoring deployments. Several device options were installed to allow MnDOT to analyze the installation and performance of different types of sensors. Both systems operated for the three years with some outages due to various causes but overall performance was acceptable. The outages were mostly related to power issues and communication issues. Valuable lessons were learned through the deployment, which may be applied to future installations. The deployment executed in this project has provided the confidence to deploy other fixed scour monitoring equipment at key bridges around the state of Minnesota. In addition, the data collected during deployment of the scour monitoring equipment has been stored and provides insight into scour processes. This data can be used by other research groups for design or research purposes.