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Resilience Of Bridges Following Aftershocks, Diego Francisco Espinosa
Resilience Of Bridges Following Aftershocks, Diego Francisco Espinosa
Electronic Theses and Dissertations
The ability to predict the reduction in capacity of a structure after an earthquake is vital in the process of assessing a structure after a main-shock or an after-shock. Main-shocks are normally followed by a few aftershocks in a short period of time. Researchers in the past have focused for the most part on the effects of main-shocks on buildings. Very little research has been performed on the ability to predict the reduction in capacity of bridges in aftershocks. This thesis focuses on providing a way of assessing the reduction in capacity for main-shocks as compared to aftershocks and the …
Transfer And Development Length Of Strands In Post-Tensioned Members After Anchor Head Failure, Elie El Zghayar
Transfer And Development Length Of Strands In Post-Tensioned Members After Anchor Head Failure, Elie El Zghayar
Electronic Theses and Dissertations
Post-tensioning tendons in segmental bridge construction are often only anchored within the deviator and pier segments. The effectiveness of the post-tensioning (PT) system is therefore dependent on proper functioning of the anchorages. On August 28, 2000 a routine inspection of the Mid-Bay Bridge (Okaloosa County, Florida) revealed corrosion in numerous PT tendons. Moreover, one of the 19-strand tendons was completely slacked, with later inspection revealing a corrosion-induced failure at the pier anchor location. Anchorage failure caused all PT force to transfer to the steel duct located within the pier segment that in turn slipped and caused the tendon to go …
Response Sensitivity Of Highway Bridges To Random Multi-Component Earthquake Excitation, Kyle Cronin
Response Sensitivity Of Highway Bridges To Random Multi-Component Earthquake Excitation, Kyle Cronin
Electronic Theses and Dissertations
Highway bridges provide a critical lifeline during extreme seismic events and must maintain serviceability under a large range of earthquake intensities. Consequently, the advent of more computational power has allowed more advanced analysis approaches for predicting performance and vulnerability of highway bridges under these seismic loads. In traditional two-dimensional finite element analyses, it has been demonstrated that the incidence angle of the ground motion can play a significant role in structural response. As three-dimensional nonlinear time history analyses are used more frequently in practice, ground motions are still usually applied along a single bridge axis. It is unknown how three …