Doctor of Philosophy (PhD)
First Advisor's Name
First Advisor's Committee Title
Second Advisor's Name
Second Advisor's Committee Title
Third Advisor's Name
Third Advisor's Committee Title
Fourth Advisor's Name
Seung Jae Lee
Fourth Advisor's Committee Title
Fifth Advisor's Name
Fifth Advisor's Committee Title
Bridge Engineering, Steel Bridges, Seismic Design, Continuity detail, Simple for Dead load and Continuous for Live load, Ultra-high Performace Concrete
Date of Defense
The simple for dead load and continuous for live load (SDCL) steel bridge system has been implemented in non-seismic areas with desirable field performance. However, in seismic areas, the application of the SDCL steel bridge system has not been implemented due to a lack of verified seismic details. A connection for the steel girders over an intermediate pier using a concrete diaphragm suitable for seismic areas was developed using numerical analysis. The field application of the developed connection required experimental verification and validation.
One of the main objectives of this study was experimental verification of the developed detail under seismic loads. In this study, component level and system-level testing were performed on scale models of SDCL steel bridge system made with the developed connection detail. Component testing was performed on a scaled connection detail under cyclic loads. And the shake-table test was done on a scaled two-span steel bridge, which was subjected to earthquake excitations. In both tests, the behavior of the connection detail was desirable. The plastic hinge was formed at predefined locations and prevented the capacity-protected elements from damage. Based on the result of the experiments and complementary numerical analysis on a full-scale prototype bridge a set of design recommendations was developed.
Another objective of the study was the development of a simplified connection detail utilizing ultra-high performance concrete (UHPC). UHPC has superior mechanical properties such as high compressive and tensile strength and high ductility. UHPC is an attractive material for accelerated bridge construction applications because of its high early strength gain. In this study, a new connection detail utilizing UHPC was developed using numerical analysis. The numerical models were validated with the available experimental data. Multiple sets of parametric studies were performed to develop the connection detail and understand the behavior of the connection under various loading scenarios. The result of the numerical analysis was used to develop a set of design recommendations for the UHPC connection of the SDCL steel bridge system in non-seismic and seismic areas.
Sadeghnejad, Amir, "Alternative Connections for Accelerated Construction of Simple for Dead load and Continuous for Live load Steel Bridge System" (2021). FIU Electronic Theses and Dissertations. 4636.
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