Download or read book Acoustic Emission Monitoring of a Fracture critical Bridge written by Arturo E. Schultz and published by . This book was released on 2014 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt: With bridge infrastructure in Minnesota aging, advancing techniques for ensuring bridge safety is a fundamental goal of the Minnesota Department of Transportation (MnDOT). As such, developing health monitoring systems for fracture-critical bridges is an essential objective in meeting the stated goal. This report documents the acquisition, testing and installation of a 16-sensor acoustic emission monitoring system in the Cedar Avenue Bridge, which is a fracture-critical tied arch bridge in Burnsville, Minnesota. The overall goal of the project was to demonstrate that acoustic emission technology could be used for global monitoring of fracture-critical steel bridges. Project activities included the acquisition of the monitoring equipment, its testing to verify compliance with manufacturer specifications, installation of the equipment on the selected bridge, field testing to calibrate the system, development of data processing protocols for the acoustic emission (AE) data, and the collection of field data for a period of 22 months. Fracture tests of notched cantilever steel beams were conducted in the laboratory to provide characterization data for fracture events.

Download or read book Protocols and Criteria for Acoustic Emission Monitoring of Fracture critical Steel Bridges written by and published by . This book was released on 2015 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt: With bridge infrastructure in Minnesota aging, advancing techniques for ensuring bridge safety is a fundamental goal of the Minnesota Department of Transportation (MnDOT). Developing health monitoring systems for fracture-critical bridges is an essential objective in meeting the stated goal. This report documents the implementation of two, 16-sensor, acoustic emission monitoring systems in one of the tie girders of the Cedar Avenue Bridge, which is a fracture-critical tied arch bridge spanning the Minnesota River between Bloomington and Eagan, MN. The goal of the project is to develop a process for using acoustic emission technology to monitor one of the girders of the bridge while continuously collecting data from the monitoring systems. Given the cost of acoustic emission sensing equipment, an approach was adopted to space the sensors as widely as possible. Fracture tests were conducted on a specimen acoustically connected to the bridge to simulate fracture in a bridge member. Sets of criteria were developed to differentiate between acoustic emission data collected during fracture and ambient bridge (i.e. AE noise) data. The sets of criteria were applied to fracture test data and AE noise data to determine the validity of the criteria. For each criteria set, a period of Cedar Avenue Bridge monitoring data was analyzed. The results of the analysis of each period showed that the criteria could differentiate between the bridge AE noise data and the fracture test data. The AE noise data never met all of the criteria in the set, whereas all criteria were met during each of the applicable fracture tests.

Download or read book Quantitative Acoustic Emission Monitoring of Fatigue Cracks in Fracture Critical Steel Bridges written by Thomas Schumacher (Engineer) and published by . This book was released on 2014 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Acoustic emission monitoring of steel bridge members written by and published by . This book was released on 1995 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: This interim report describes the current status of acoustic emission (AE) monitoring of steel bridge members. The report includes a brief introduction to the theory of acoustic emission and a comprehensive summary of previous efforts to apply AE monitoring to steel bridges, and discusses issues related to AE noise discrimination. Five bridges were field tested. Extensive data from the active cracking of a hanger on the Rte. 29 bridge over the Robinson River at Madison, Virginia, are discussed. The report includes conclusions and recommendations based on extensive field monitoring. Two appendices detail the laboratory fatigue testing of bridge steels and the simulated environmental exposure of AE transducer-mounting adhesives. AE monitoring is sensitive to the acoustic energy emitted by steel bridge members during the formation and growth of cracks. It is the only method that can distinguish between active and benign cracks. It is also possible to discriminate between AE caused by crack growth and irrelevant noise. AE information can be significant in making repair or replacement decisions, and AE could be used for the continuous remote monitoring of critical bridge members or even entire bridges.

Download or read book Acoustic Emission Monitoring of In service Bridges written by Theodore Hopwood (II.) and published by . This book was released on 1987 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Acoustic Emission Monitoring for Assessment of Steel Bridge Details written by David E. Kosnik and published by . This book was released on 2010 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Acoustic Monitoring of the Main Suspension Cables of the Anthony Wayne Bridge written by Kushal Niroula and published by . This book was released on 2014 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 82 year old Anthony Wayne Bridge (AWB) in Toledo, Ohio is undergoing an extensive rehabilitation in two phases starting in construction season 2014. The plan is to first replace the approaches and rehabilitate the superstructure. Upon completion of the superstructure rehabilitation, steps to preserve the main suspension cables will be taken. Prior to taking action to preserve the cables, however, it is necessary to evaluate the condition of the cables. Therefore, as part of cable condition evaluation, an acoustic monitoring system was installed on July 2011 and has been continuously monitoring the main cables since then. Acoustic emission (AE) is a non-destructive technique which is practical for monitoring elements of bridges where invasive inspection is either difficult or costly. The AE system can be accessed remotely in real time and it does not cause any interruption to traffic. In the case of a suspension bridge, main cables are of primary concern as their condition cannot be assessed externally unlike other bridge components and they are fracture critical. This paper presents a case study on the application of the acoustic emission technique to the main cables of the AWB. Several laboratory experiments were planned and executed to develop understanding of the potential AE sources. Wire breaks were the primary AE sources under concern. Rain and frictional activities induced by traffic and wind events would create secondary and/or noise sources. The rain, friction and wire break were all simulated in the laboratory and it was verified that, by using a combination of parameters along with signal signatures, a wire break signal can be discriminated against other secondary or noise sources. The AE monitoring system on the AWB uses a series of 7 algorithms that analyze the parameters of each detected AE event. For each feature that meets or exceeds the value of the classification, it is assigned a source type ranging from 0 to 7. Thus for a wire break, the AE signal would meet or exceed all 7 criteria and would receive a 'source type' classification of '7'. The analysis of the data collected on the AWB during January 2013 to June 2013 (excluding May 2013) showed very high acoustic activity near sensors 1, 2, 14 and 15. After further examination it was found that those activities were of frictional nature caused by weather events and traffic induced movements. Many AE events were classified as high as 'source type 6' that occurred during extreme weather events and there was not any 'source type 7' event. This suggests that no wire breaks have been recorded so far. No wire breaks were discovered during the 2012 invasive inspection too, which supports the results from AE monitoring. Meanwhile, the system was unable to capture the signal produced by cutting of wire samples during the invasive inspection and this challenges the reliability of the monitoring system. An 'Auto Sensor Test' performed in March 2014 indicates that there has been degradation in the system's performance. Many of the sensors do not seem to have proper coupling, thereby causing difficulty in effective signal-source interpretation. Very few AE events were observed in a review of data from the bridge closure period that started on March 17, 2014.

Download or read book Acoustic Emission Monitoring of Fatigue Cracks in Steel Bridge Structures written by Jay McKeefry and published by . This book was released on 1999 with total page 95 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents results from a laboratory study and field implementation of acoustic emission monitoring or fatigue cracks in cover-plated steel bridge girders. The acoustic monitoring successfully detected growing fatigue cracks in the lab when using both source location and a state of stress criteria. Application of this methodology on 3 field bridges also proved successful by detecting a propagating crack in 2 of the bridges and an extinguished crack in a third bridge.

Download or read book Acoustic Emission Monitoring of Fatigue Cracks in Steel Bridge Girders written by and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Acoustic Emission Detection and Monitoring of Highway Bridge Components written by and published by . This book was released on 1991 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Acoustic Emission Monitoring on Bridges Under Regular Operating Conditions written by Małgorzata Weronika Felux Kalicka and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Acoustic Emission Monitoring of North East Trunnion Shaft on Oregon DOT Bridge 1377A I 5 Over the Columbia River Portland Oregon update written by D. W. Prine and published by . This book was released on 1996 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Acoustic Emission Monitoring of the Trunnion Shafts on Oregon DOT Bridge 1377A I 5 Interstate Columbia River Bridge East Lift Span Portland Oregon written by D. W. Prine and published by . This book was released on 1994 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Acoustic Emission Detection and Monitoring of Highway Bridge Components written by Mohammad Azmi and published by . This book was released on 1989 with total page 466 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Acoustic Emission Detection and Monitoring of Highway Bridge Components written by Donald W. Vannoy and published by . This book was released on 1987 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Safety and Reliability of Bridge Structures written by Khaled Mahmoud and published by CRC Press. This book was released on 2009-09-21 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent surveys of the U.S. infrastructure‘s condition have rated a staggering number of bridges structurally deficient or functionally obsolete. While not necessarily unsafe, a structurally deficient bridge must be posted for weight and have limits for speed, due to its deteriorated structural components. Bridges with old design features that canno

Download or read book Structural Integrity Monitoring of Steel Bridges Using Acoustic Emission Techniques written by Rhys Pullin and published by . This book was released on 2001 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt: