Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 3 of 3
Full-Text Articles in Engineering
Monitoring The Effects Of Knickpoint Erosion On Bridge Pier And Abutment Structural Damage Due To Scour, Thanos Papanicolaou Ph.D., David M. Admiraal, Christopher Wilson Ph.D., University Of Iowa
Monitoring The Effects Of Knickpoint Erosion On Bridge Pier And Abutment Structural Damage Due To Scour, Thanos Papanicolaou Ph.D., David M. Admiraal, Christopher Wilson Ph.D., University Of Iowa
Mid-America Transportation Center: Final Reports and Technical Briefs
The goal of this study was to conduct a field-oriented evaluation, coupled with advanced laboratory techniques, of channel degradation in a stream of the Deep Loess Region of western Iowa, namely Mud Creek. The Midwestern United States is an ideal place for such a study considering that ~$1 Billion of infrastructure and farmland has been lost recently to channel degradation. A common form of channel degradation in this region is associated with the formation of knickpoints, which naturally manifest as short waterfalls within the channel that migrate upstream. As flow plunges over a knickpoint face, scouring of the downstream bed …
Use Of Fiber Bragg Grating (Fbg) Sensors For Performing Automated Bridge Pier Structural Damage Detection And Scour Monitoring, A.N. Thanos Papnicolaou Ph.D., Achilleas Tsakiris
Use Of Fiber Bragg Grating (Fbg) Sensors For Performing Automated Bridge Pier Structural Damage Detection And Scour Monitoring, A.N. Thanos Papnicolaou Ph.D., Achilleas Tsakiris
Mid-America Transportation Center: Final Reports and Technical Briefs
The goal of this study was to evaluate the performance of Fiber Bragg Grating (FBG) sensors able to detect impacts with different frequencies on a bridge pier. The FBG technology was evaluated under controlled conditions in a laboratory flume set-up to mimic the flow, sediment, and design characteristics of a pier structure. The system was calibrated using site-specific properties to relate strain to a known magnitude force for different bridge pier designs, different scour depths, and structural impacts. The FBGs proved a reliable measure of strain and displacement for key components of bridge structures, such as piers, during varying flow …
Automated Erosion System To Protect Highway Bridge Crossings At Abutments, Thanos Papanicolaou Ph.D., Christopher Wilson Ph.D., Mohamed Elkakeem Ph.D.
Automated Erosion System To Protect Highway Bridge Crossings At Abutments, Thanos Papanicolaou Ph.D., Christopher Wilson Ph.D., Mohamed Elkakeem Ph.D.
Mid-America Transportation Center: Final Reports and Technical Briefs
A new instrument (Photo-Electronic Erosion Pin, or PEEP) was examined in collecting field data and remotely monitoring bank erosion near bridge abutments during floods. The performance of PEEPs was evaluated through a detailed field study to determine factors affecting their records. Proper calibration of the instrument was important in obtaining accurate erosion lengths. Calibration of the PEEPs within the banks nearby the study reach provided the most accurate erosion lengths. In addition, comparison with traditional, manual methods was recommended. Bank erosion was monitored at two study sites at the Clear Creek Watershed (CCW), IA between May 2009 and December 2009 …