Doctor of Philosophy (PhD)
First Advisor's Name
First Advisor's Committee Title
Second Advisor's Name
Arindam Gan Chowdhury
Second Advisor's Committee Title
Third Advisor's Name
Third Advisor's Committee Title
Fourth Advisor's Name
Fourth Advisor's Committee Title
Fifth Advisor's Name
Fifth Advisor's Committee Title
Seismic connections, Accelerated Bridge Construction, Structural Engineering
Date of Defense
The synergistic interaction of steel and concrete in concrete filled tube (CFT) composite members improves structural performance by delaying local buckling of steel tube. Compared to localized confinement provided by discreet ties in reinforced columns, the steel tube provides continuous confinement to infill concrete which results in improved energy dissipation and ductility performance. Concrete filled tubes (CFTs) provide improved structural strength and ductility while minimizing the cost of column formwork. The construction sequence of CFT allows its use for accelerated bridge construction applications. The use of CFTs for bridges in the U.S. has been limited mainly due to lack of design provisions, particularly for seismic zones. This research proposes a new detail for column-to-footing connection using ultra-high performance concrete (UHPC). Several details were studied, and a detail comprises of CFT embedded in a layer of UHPC located near the plastic hinge zone of the column is selected to for experimental and numerical study. Using experiments from existing literature, pretest finite element analysis was carried out on the design parameters including effect of confinement, tension pull out and shear behavior of the connectors.
Three connection details were experimentally studied under a combination of constant axial and incremental lateral cyclic load. The proposed connection is desired to have a ductile behavior with the plastic hinge forming away from the footing which is typically designed as a capacity protected element. The results of the experiments and pretest analysis were used to carry out parametric finite element analysis. Further experimental and numerical study is proposed to recommend design and construction provisions.
Previously Published In
- Rehmat, S., Sadeghnejad, A., Mantawy, I.M. and Azizinamini, A., 2021. Experimental study on concrete filled steel tubes to footing connection using ultra-high performance concrete. Engineering Structures, 242, p.112540.
- Azizinamini, A., Rehmat, S. and Sadeghnejad, A., 2019. Enhancing resiliency and delivery of bridge elements using ultra-high performance concrete as formwork. Transportation Research Record, 2673(5), pp.443-453.
SHEHARYAR E REHMAT, FNU, "New Connection Details for Concrete Filled Tubes to Precast Concrete Elements for Accelerated Bridge Construction Applications" (2022). FIU Electronic Theses and Dissertations. 5038.
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