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A Failure Analysis Case Study of the Fluid-Structural Interactions on Trashracks

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dc.contributor.advisor Reinhall, Per en_US Scheumann, Timothy M. en_US 2012-09-13T17:36:37Z 2012-09-13T17:36:37Z 2012-09-13 2012 en_US
dc.identifier.other Scheumann_washington_0250O_10496.pdf en_US
dc.description Thesis (Master's)--University of Washington, 2012 en_US
dc.description.abstract A failure analysis investigation was completed on the trashracks at Powerhouse One of Rock Island Dam. The investigation was part of the overall condition assessment and rehabilitation work being performed at the dam. The trashracks were deemed a faulty system in 2005 when MWH, a contractor for Chelan County PUD, initially inspected the racks. Building on the original work completed by MWH, this project compiled background information and conducted field inspections to evaluate the future reliability of the trashracks. The field inspections identified consistent failures of the diagonal tie rods, discovered cracks in the rackbar welds, and highlighted the noticeable presence of corrosion damage. Though localized failures were identified, a static analysis concluded that the overall structural design was adequate for continued operations. Field tests and a finite element model were compared in a dynamic analysis to ensure the vibration induced stresses did not reach the allowable limit. Ultimately, the trashracks received new diagonal braces constructed from angle iron to replace the failing tie rods. Damaged welds, caused by the propagation of cracks from welding defects, were repaired and the racks were sandblasted to remove corrosion debris and repainted to prevent future degradation. en_US
dc.format.mimetype application/pdf en_US
dc.language.iso en_US en_US
dc.rights Copyright is held by the individual authors. en_US
dc.subject failure analysis; fluid-structural; Rock Island Dam; Scheumann; trashrack; trash rack en_US
dc.subject.other Mechanical engineering en_US
dc.subject.other Civil engineering en_US
dc.subject.other Mechanical engineering en_US
dc.title A Failure Analysis Case Study of the Fluid-Structural Interactions on Trashracks en_US
dc.type Thesis en_US
dc.embargo.terms No embargo en_US

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