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Full-Text Articles in Engineering
Inspection Of Flexible Fillers In Post-Tensioned Bridges, Carley Gonzalez
Inspection Of Flexible Fillers In Post-Tensioned Bridges, Carley Gonzalez
Doctoral Dissertations and Master's Theses
The Florida Department of Transportation (FDOT) is currently pushing toward the use of flexible fillers (FF) in new post-tensioned (PT) bridges. Flexible fillers have several advantages compared to the currently used cementitious grouts (CG) and can offer longer-lasting structures by providing better corrosion protection and allowing for replaceable tendons, which reduces the overall maintenance costs over the structure’s lifespan. Due to these fillers being used in new bridges, FDOT needs effective nondestructive evaluation (NDE) methods to employ in their biennial inspections. There are currently numerous NDE methods available to inspectors that have been used to identify defects in PT bridges …
Ultrasonic Ndt Methods For The Evaluation Of Post-Tensioned Systems With Flexible Fillers, Denis Mcdonald
Ultrasonic Ndt Methods For The Evaluation Of Post-Tensioned Systems With Flexible Fillers, Denis Mcdonald
Doctoral Dissertations and Master's Theses
Non-destructive evaluation of post-tensioned structures with flexible fillers is desperately needed due to their rapid implementation in the State of Florida, primarily in roadway structures. This study provides an overview of existing evaluation methods for traditional post-tensioned structures with cementitious grouts and further explores two promising methods to be applied to flexible filler systems. The first method, diffuse ultrasound spectroscopy, indirectly evaluates posttensioned structures by quantifying the severity of microcracking in the structure. Microcrack detection is accomplished by processing received waveforms generated with a pitch-catch transducer configuration. The second method, coda-wave interferometry, measures the velocity variation at the tail end …
Evaluating The Effects Of Shored Construction On Steel Girder Composite Bridges, Parker Brooks
Evaluating The Effects Of Shored Construction On Steel Girder Composite Bridges, Parker Brooks
Doctoral Dissertations and Master's Theses
Steel composite girder bridges provide economic advantages and higher load-carrying capacity than non-composite alternatives. Over the years, a conventional sequence of un-shored construction for steel girder composite bridges has been developed. There is an alternative construction sequence, known as shored construction, that uses temporary supports (discretely or fully supported) for the superstructure during the installation of metal forms and the pouring of concrete. Shored construction also can be used in an Accelerated Bridge Construction (ABC) practice where construction occurs at a nearby site and fully-formed elements are transported to the final site using self-propelled modular transporters (SPMTs). In order to …