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

2019 ◽  
Vol 4 (2) ◽  
pp. 25 ◽  
Author(s):  
Nerma Caluk ◽  
Islam Mantawy ◽  
Atorod Azizinamini
Keyword(s):  
High Performance Concrete ◽  
Plastic Hinge ◽  
Main Idea ◽  
Protective Layer ◽  
Bridge Columns ◽  
Technical Note ◽  
Accelerated Bridge Construction ◽  
Bridge Construction ◽  
Construction Time ◽  
Normal Concrete

Ultra-high performance concrete (UHPC) is a durable material that allows the construction of innovative structural elements and conforms with accelerated bridge construction (ABC) goals. The main idea of this research is to utilize UHPC to prefabricate a shell that acts as a stay-in-place form for bridge columns. The prefabricated shell eliminates the conventional formwork while reducing the on-site construction time and acting as a durable protective layer for the normal concrete inside the shell against environmental attacks. In addition, the UHPC shell provides additional confinement to the column concrete, which improves the column’s structural performance. During construction and after completing the column reinforcement work onsite, based on the conventional construction methods, the prefabricated UHPC shell is placed around the column reinforcement, followed by casting a portion of UHPC for a column-to-footing connection, which improves the capacity of the connection and shifts the plastic hinge zone above the connection. Once the UHPC portion hardens, normal concrete is placed inside the shell, forming a permanent concrete-filled UHPC shell. The construction process is finalized by placing and connecting a prefabricated cap beam to the column through the same developed connection as that in this research. This technical note presents the development of two test specimens using an UHPC shell in lieu of a conventional formwork with the advantage of improving the column performance and durability.

New Connection Detail to Connect Precast Column to Cap Beam using Ultra-High-Performance Concrete in Accelerated Bridge Construction Applications

2018 ◽  
Vol 2672 (41) ◽  
pp. 207-220 ◽  
Author(s):  
Mohamadreza Shafieifar ◽  
Mahsa Farzad ◽  
Atorod Azizinamini
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Precast Concrete ◽  
Experimental Program ◽  
Accelerated Bridge Construction ◽  
Ultra High Performance Concrete ◽  
Bridge Construction ◽  
Construction Time ◽  
Element Analysis ◽  
Displacement Ductility

Accelerated bridge construction (ABC) is a paradigm change in delivery of bridges. ABC minimizes the traffic interruption, enhances safety to public and workers by significantly reducing on-site construction activities, and results in longer-lasting bridges. The use of precast elements is gaining attention owing to inherent benefits of accelerated construction. Designing an economical connection is one of the main concerns for these structures. New improved materials such as ultra-high-performance concrete (UHPC) with superior characteristics can provide solutions for joining precast concrete elements. In this paper two types of column to cap beam connection using UHPC are proposed for seismic and non-seismic regions. Among the merits of the proposed details, large tolerances in construction and simplicity of the connection can be highlighted which facilitates and accelerates the on-site construction time. The experimental program was carried out to evaluate the performance and structural behavior of the proposed connections. Four specimens were subjected to constant axial compressive loads and cyclic lateral loading. Results of the experiment showed that the displacement ductility of the specimens, incorporating suggested details, demonstrated adequate levels of displacement ductility. More importantly, the proposed connections prevented the damage into capacity protected element—in this case the cap beam. Analytical and nonlinear finite element analysis on the specimens was carried out to better comprehend the behavior of the proposed connections.

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

2020 ◽  
Vol 2674 (2) ◽  
pp. 158-166 ◽  
Author(s):  
Nerma Caluk ◽  
Islam M. Mantawy ◽  
Atorod Azizinamini
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Plastic Hinge ◽  
Protective Layer ◽  
Structural Elements ◽  
Ultra High Performance Concrete ◽  
Reinforced Concrete Column ◽  
Construction Time ◽  
The North ◽  
Drift Ratio

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.

scholarly journals Polymer Concrete for Bridge Deck Closure Joints in Accelerated Bridge Construction

2019 ◽  
Vol 4 (2) ◽  
pp. 31 ◽  
Author(s):  
Islam Mantawy ◽  
Rahulreddy Chennareddy ◽  
Moneeb Genedy ◽  
Mahmoud Reda Taha
Keyword(s):  
Shear Strength ◽  
High Performance ◽  
Bridge Deck ◽  
High Performance Concrete ◽  
Polymer Concrete ◽  
Accelerated Bridge Construction ◽  
Development Length ◽  
Bridge Construction ◽  
Reinforcing Bar ◽  
Bar Diameter

Prefabricated concrete bridge deck panels are utilized in Accelerated Bridge Construction (ABC) to simplify bridge deck construction. Concrete with good bond and shear strength as well as excellent flowability is required to fill bridge deck closure joints. This paper discusses the use of polymer concrete (PC) for bridge deck closure joints in ABC. PC produced using poly methyl methacrylate and standard aggregate was tested. Test results of PC are compared to Ultra-High Performance Concrete (UHPC). Development length, lap splice length and shear strength of unreinforced PC were tested. It is shown that PC has a development length of 3.6 to 4.1 times the reinforcing bar diameter that is close to one-half the development length of 6 to 8 times the bar diameter required with UHPC. PC also showed a shorter splice length compared with that reported for UHPC. Finally, unreinforced PC showed shear strength that is twice that of UHPC. It is evident that using PC in bridge deck closure joints in ABC can improve constructability and provide cost-savings and eliminate reinforcing bar congestion.

Decision Making and Economic Analysis for Accelerated Bridge Construction

2013 ◽  
Vol 423-426 ◽  
pp. 2196-2201 ◽  
Author(s):  
Zeng Zhong Wang ◽  
Bin Shi
Keyword(s):  
Decision Making ◽  
Construction Projects ◽  
New Technology ◽  
Cost Effective ◽  
Accelerated Bridge Construction ◽  
Bridge Construction ◽  
Construction Time ◽  
Early Stages ◽  
Effective Manner ◽  
The Impact

Accelerated Bridge Construction (ABC) is recognized as an important method to design and rehabilitate highway bridge structures. ABC is bridge construction that uses innovative planning, design, materials, and construction methods in a safe and cost-effective manner to reduce the onsite construction time that occurs when building new bridges or replacing and rehabilitating existing bridges. ABC uses both new technology and innovative project management techniques to reduce the impact of bridge construction projects on the public and to reduce bridge construction costs. In the early stages of a construction project, engineers need to assess whether elements of ABC are achievable and effective for a specific bridge location. Use of decision-making tools in early stages of planning is advocated as a mechanism for helping decision maker assess alternatives with more confidence and for preventing investment in alternatives that are more costly. In this study, a set of decision making tools, based on the Bridge Construction Index (BCI) were developed. This tool is prepared for transportation specialists and decision-makers to determine if ABC techniques are more effective than traditional construction for a given bridge replacement or rehabilitation project.

Accelerated bridge construction in Washington State: From research to practice

PCI Journal ◽  
2012 ◽  
Vol 57 (4) ◽  
pp. 34-49 ◽  
Author(s):  
Bijan Khaleghi ◽  
Eric Schultz ◽  
Stephen Seguirant ◽  
Lee Marsh ◽  
Olafur Haraldsson ◽  
...  
Keyword(s):  
Washington State ◽  
Accelerated Bridge Construction ◽  
Research To Practice ◽  
Bridge Construction
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