Durable Bridge Columns using Stay-In-Place UHPC Shells for Accelerated Bridge Construction

Caluk, Nerma; Mantawy, Islam M.; Azizinamini, Atorod

doi:10.3390/infrastructures4020025

Cited by 24 publications

(8 citation statements)

References 3 publications

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“…Since UHPC material is smooth once hardened, the friction between the UHPC shell and the normal concrete was expected to be an issue; however, no notable slippage was observed. To prevent any possible slippage, the longitudinal bars of the cage could be partially embedded in the UHPC shell and shared with column concrete which will enhance the bond between the shell and the conventional concrete ( 3 ). Another possible solution for this issue would be the use of the UHPC shell with corrugation in the inner surface similar to the corrugation in socket connections ( 18 – 20 ).…”

Section: Discussionmentioning

confidence: 99%

“…To prevent possible risk of formwork and scaffolding failure, a concept has been developed at Florida International University by the third author where ultra-high performance concrete (UHPC) is used to construct a prefabricated shell that acts as a permanent stay-in-place form for bridge elements such as bridge columns and cap-beams ( 3 , 4 ). Caluk et al provide the constructability of UHPC shells for columns, and Azizinamini et al show detailed experimental results and comparison of cap-beams made of UHPC shell and identical cast-in-place cap-beams ( 3 , 4 ). The use of prefabricated shells eliminates the conventional formwork and scaffolding, reduces right-of-way issues, traffic congestion, and on-site construction time.…”

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confidence: 99%

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Cyclic Test of Concrete Bridge Column Utilizing Ultra-High Performance Concrete Shell

Caluk

Mantawy

Azizinamini

2020

Transportation Research Record

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Ultra-high performance concrete (UHPC) is a durable material that can be used in constructing new and unique structural elements. This research utilizes UHPC to construct prefabricated shells that act as stay-in-place forms for bridge columns and eliminate the use of traditional formwork. These innovative structural elements reduce the on-site construction time, improve the structural performance of the column, and act as a protective layer in aggressive environments. Generally, during the construction process, the prefabricated UHPC shell is placed around the column reinforcement, which is fabricated using conventional methods. To connect the UHPC shell and column reinforcement with the footing and footing dowels, a step made of UHPC is utilized. The UHPC step connection is designed to shift the plastic hinge away from the column-to-footing interface. In the next stage, normal concrete is cast inside the shell, forming a concrete-filled UHPC shell. The final stage of construction involves placing and connecting a prefabricated cap-beam using the same UHPC step connection. The column specimen was tested under constant axial load and incremental lateral load. In this test, the UHPC shell cracked on the north side at a drift ratio of 3%; however, the column had a significant capacity and behaved similarly to a conventional reinforced concrete column during higher cycles of drift ratios. The test was completed after the column had reached a drift ratio of 7.5% when the first bar ruptured. No damage occurred in the footing and UHPC step which proved that the design was successful in shifting the plastic hinge away from the column-to-footing interface.

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Section: Discussionmentioning

confidence: 99%

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confidence: 99%

Cyclic Test of Concrete Bridge Column Utilizing Ultra-High Performance Concrete Shell

Caluk

Mantawy

Azizinamini

2020

Transportation Research Record

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“…UHPC has steel fibers and it also has high strength properties so that it fulfills the mechanical testing criteria for 3D-printing. This 3D-printing system is flexible enough to print different bridge elements such as cap beam shells (25)(26)(27) or column shells (28,29).…”

Section: Conceptual Design Of 3d-printermentioning

confidence: 99%

3D-Printing of Ultra-High-Performance Concrete for Robotic Bridge Construction

Javed

Mantawy

Azizinamini

2021

Transportation Research Record

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Automation and robotics are integral parts of many industries but their potential for field implementation has not been significantly recognized by the construction industry. This is mainly attributed to conventional construction and design practices which undermine the benefits offered by these new technologies such as repetitions, precision, time savings, and increased safety. There is a need for advanced materials and 3D-printing systems which are capable of constructing structural elements with performance that emulates conventionally cast elements. This study presents a detailed framework and performance metrics for materials and 3D-printing systems for bridge applications. In addition, a study was carried out on ultra-high-performance concrete (UHPC) which showed sufficient extrudability and workability for 3D-printing applications. A 3D-printing system was developed for 3D-printing of continuous additive layers of UHPC with accelerated heat curing. Accelerated heat curing was used to enhance buildability, expedite the printing of the UHPC layers, and maximize the number of printed layers within the material open time. The effect of heat curing on material properties was also evaluated to obtain the optimal temperature to satisfy compressive strength requirements. This research effort aims to augment automated construction techniques and develop solutions to extend the applications of accelerated bridge construction.

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“…The method refers to the simultaneous bending and axial capacity of a section, namely to the ultimate combinations of bending moment and axial force [1,2,[4][5][6]8,10,13,28,29,32,[35][36][37][38][39][40][41][42][43]. Those combinations define the bending moment-axial force interaction curve.…”

Section: Bending Moment-axial Force Interaction Curve As a Criterion For Optimalitymentioning

confidence: 99%

Optimal Design of Seismic Resistant RC Columns

Foraboschi

2020

Materials

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Although the author is well aware that it is nothing special, presented here is the method that he uses to design the columns of a seismic resistant reinforced concrete structure, in hopes that this could be of use to someone. The method, which is directed at satisfying the capacity design requirements without excessively large sections, consists of proportioning the column so that the seismic action effects shall be resisted by the maximum of the bending moment–axial force interaction curve. That design condition is defined by two equations whose solution provides the optimal aspect ratio (or, alternatively, the optimal section side length) and the maximum feasible reinforcement ratio. The method can be used directly to determine the optimal column for given beam spans and vertical loads, or indirectly to determine the optimal beam spans and vertical loads for given cross-sectional dimensions. The paper presents the method, including its proof, and some applications together with the analysis on the optimality of the obtained solutions. The method is intended especially for the practicing structural engineer, though it may also be useful for educators, students, and building officials.

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Durable Bridge Columns using Stay-In-Place UHPC Shells for Accelerated Bridge Construction

Cited by 24 publications

References 3 publications

Cyclic Test of Concrete Bridge Column Utilizing Ultra-High Performance Concrete Shell

Cyclic Test of Concrete Bridge Column Utilizing Ultra-High Performance Concrete Shell

3D-Printing of Ultra-High-Performance Concrete for Robotic Bridge Construction

Optimal Design of Seismic Resistant RC Columns

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