Doctor of Philosophy (PhD)
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FDPC Deck Panels, Non-Proprietary UHPC, performance comparison, Particle Packing Analysis
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Full-depth precast concrete (FDPC) deck panels are a type of prefabricated bridge element used in accelerated bridge construction (ABC) that have been used in bridge construction since the 1960’s as an alternative to conventional CIP decks. The main purpose of using the prefabricated elements is to accelerate the construction and increase the long-term performance. FDPC deck panels itself offers superior durability and performance, but the connection between these elements still have shown some long-term issues like cracking. Ultra-high-performance concrete (UHPC) is an innovative and commercially available material that has been used to address concerns related to connection between precast elements. The high compressive strength and tensile strength alongside with superior durability of UHPC, has made it a solution for addressing the performance issue related to connection precast members, but its relatively high cost, has limited its widespread use. Hence, the non-proprietary UHPC was considered as an alternative of commercial UHPC with significantly lower price. In this study, previous investigations on FDPC deck panels were reviewed and a database for bridges constructed with FDPC deck panels were created and their long-term performance were predicted and compared with bridges constructed with cast in place deck. Then, a comprehensive experimental work was conducted to develop the non-proprietary UHPC using locally available material.
This research was expanded numerically then by studying the performance of non-proprietary UHPC in joint between FDPC deck panels. Finite element numerical analysis using ATENA was performed to compare the performance of developed non-proprietary UHPC with commercial UHPC in joint applications. Six different numerical specimens with different joint width were considered and the performance of different material under static loading were analyzed.
Results, revealed that the developed non-proprietary UHPC in this study, can perform similar to specimens with commercial UHPC joints. As it was expected, sensitivity analysis determined that tensile strength, tension function of UHPC and its bond behavior with precast elements, play the critical role and having a very high compressive strength and modulus of elasticity is not a big advantage when it is used to connect precast members under flexural load.
Previously Published In
D. Garber and E. Shahrokhinasab, “Performance Comparison of In-Service, Full-Depth Precast Concrete Deck Panels to Cast-in-Place Decks,” Accelerated Bridge Construction University Transportation Center (ABC-UTC), 2019.
E. Shahrokhinasab and D. Garber (2021). Long-term performance of full-depth precast concrete (FDPC) deck panels,” Eng. Struct., vol. 244, p. 112738.
E. Shahrokhinasab, T. Looney, R. Floyd, and D. Garber (2021). Effect of Fiber, Cement, and Aggregate Type on Mechanical Properties of UHPC,” Civ. Eng. J., vol. 7, no. 8, pp. 1290–1309
Shahrokhinasab, Esmail, "Improving the Long-term Performance of Full-depth Precast Concrete (FDPC) Deck Panels Using Non-Proprietary UHPC" (2021). FIU Electronic Theses and Dissertations. 4897.
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