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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Showing 1-5 of 607 Abstracts search results
March 1, 2021
Seong Ryong Ahn and Thomas H.-K. Kang
Impact resistance of concrete panels has been researched since the 19th century. Studies therein primarily
focused on conventionally reinforced concrete and steel fiber-reinforced concrete. Little research on the impact
resistance of prestressed concrete exists. This paper investigated the impact resistance of prestressed concrete panels
subject to hard and soft/hollow projectiles and under an assortment of prestressing levels. Damage mode, velocity
change, impact force, and internal energy were measured and analyzed. A total of twelve finite element analyses,
which considered high strain rate effects, were performed, as well as preliminary analyses with different mesh sizes.
It is observed that level of prestressing tends to improve perforation resistance of concrete panels. Additionally,
large deformation at soft projectiles occurred during impact, consuming the greater internal energy of the projectiles,
unlike hard projectiles. As a result, soft projectiles caused a smaller degree of local failure on the concrete panels
than hard projectiles with the same mass and velocity.
January 1, 2021
Christopher Gamache, Ananda Bergeron, and Pooya Farahbakhsh
The intent of this paper is to provide an illustrative example of a municipal bridge replacement design
project utilizing fiber reinforced polymer materials approved for use by the Florida Department of Transportation.
Specifically this paper describes the design of the Nathaniel J. Upham (40th Avenue NE) Bridge replacement project
and illustrates the application of carbon fiber reinforced polymer (CFRP) prestressing tendons and glass fiber
reinforced polymer (GFRP) reinforcing bars in both precast and cast-in-place concrete elements. Due to the structure’s
high level of exposure in the extremely aggressive environment, the design for the replacement bridge focused on
concrete elements that were durable and resilient to the effects of corrosion in those conditions. Prestressed and castin-
place concrete elements with GFRP and CFRP reinforcement and prestressing tendons were utilized for the primary
structural elements with direct exposure to salt water. In addition, link slabs with GFRP reinforcing were utilized at
each intermediate bent to improve the bridge’s performance. The design of the bridge elements followed the Florida
Department of Transportation’s design guidelines and requirements. The bridge replacement project is currently at
the completion of the design phase and is scheduled to be advertised in the early summer of 2020 with the start of
construction anticipated in the fall of 2020.
Joseph Losaria, Steven Nolan, Andra Diggs II, and David Hartman
This case study highlights the use of Fiber Reinforced Polymer (FRP) materials on the US 41 Highway
Bridge over North Creek in Sarasota County near the Florida Gulf Coast. Design and construction involved the use
of Glass-FRP (GFRP) reinforcement on the cast-in-place (CIP) concrete flat slab superstructure, Carbon-FRP (CFRP)
prestressing strands on the concrete piles, and GFRP reinforced precast panels for the substructure combining a bridge
bearing abutment and retaining wall system. The application of FRP prestressing and reinforcing is promoted by the
Florida Department of Transportation (FDOT) under their Transportation Innovation Challenge initiative. Soldier-pile
retaining walls are a commonly used system in southeastern US coastal states, but the incorporation of innovative
materials such as CFRP-prestressing for piles and GFRP-reinforcing for concrete panels is not yet widespread.
Comparison of lateral stability results of this wall system during construction and in the final condition is discussed.
In addition, to describing the preferred FRP-PC/RC solution adopted for this project, a comparison is provided to a
recently completed adjacent bridge that utilized a conventional carbon-steel PC soldier-pile and RC precast panel wall
system. A further comparison is presented for the design and cost of the wall system based on the project design
criteria (ACI 440.1R, ACI 440.4R, and 2009 AASHTO LRFD Bridge Design Guide Specifications for GFRPReinforced
Concrete, 1st Edition) with the refinements and savings possible under the newer editions. Finally, the
life-cycle cost, durability and environmental benefits from the use of the innovative CFRP and GFRP reinforcing
systems in this type of traditional wall system, are identified for typical urban coastal areas with extremely aggressive
conditions, congested access, and challenging environmental constraints.
Wael Zatar, Hai Nguyen, and Hien Nghiem
Many aging concrete bridges across the United States have exhibited severe deteriorations and in urgent
need of rehabilitation, retrofitting or replacement. The deterioration is caused by a combination of factors including
corrosion of reinforcing steel, freeze-thaw damage and chloride/water ingress. Fiber-Reinforced Polymer (FRP)
composite fibers, laminates, reinforcing bars and prestressed tendons have been successfully employed in civil
infrastructure applications in the past three decades. The State of West Virginia has one of the highest percentages of
structurally deficient bridges in the United States and this study covers a few case studies of the use of FRP composites
for rehabilitating the State’s deficient bridges. Non-destructive ultrasonic pulse-echo testing is employed to map
reinforcing rebars and detect delaminations of reinforced concrete slabs. A software, that employs the modified
synthetic aperture focusing technique (SAFT) image reconstruction algorithm and signal processing, is developed to
effectively visualize the reinforcing rebars and delaminations.
October 21, 2020
The design and analysis of structural concrete elements is a topic of practical interest. While sometimes the effect of torsion is only addressed based on simple examples, practicing engineers are faced with the need to include the effects of torsion in their designs of a variety of structures and load arrangements.
This Special Publication (SP) contains papers about the design of reinforced and prestressed concrete elements for torsion. The focus of the SP is on practical design examples according to different concrete bridge and building codes. In addition to the design examples, papers dealing with the current state of the art on torsion in structural concrete, as well as recent advances in the analysis and design of concrete elements failing in torsion, are added.
The objectives of this SP are to provide practicing engineers with the tools necessary to better understand and design concrete elements for torsion. The need for this SP arose after the development of the State-of-the-Art Report on Torsion of Joint ACI-ASCE Committee 445 “Shear and Torsion” and Subcommittee 445-E “Torsion”. Usually, the attention that is paid to torsion in engineering education is limited to simplified textbook examples. The examples in this SP show applications in bridges and buildings, where the torsion design is combined with the design for flexure and shear. Additionally, the examples in this SP give insight on the different outcomes when using different bridge and building codes. Finally, the papers that include theoretical considerations give practicing engineers a deeper understanding and background on torsion in structural concrete.
The views from an international group of authors are included in this SP, subsequently representing a variety of building and bridge codes the engineer may encounter in practice. In particular, authors from the United States, Canada, Ecuador, the Netherlands, Italy, Greece, and the Czech Republic contributed to the papers in this SP. Views from academia and the industry are included.
To exchange experience in the design of torsion-critical structures as well as new research insights on torsion, Joint ACI-ASCE Committee 445 and Subcommittee 445-E organized two sessions titled “Examples for the Design of Reinforced and Prestressed Concrete Members under Torsion” at the ACI Fall Convention 2020. This SP contains several technical papers from experts who presented their work at these sessions, in addition to papers submitted for publication only.
In summary, this SP addresses numerous practical examples of structural elements under torsion in bridges and buildings, as well as insights from recent research applied to practical cases of elements under torsion. The co-editors of this SP are grateful for the contributions of the authors and sincerely value the time and effort they invested in preparing the papers in this volume, as well as the contributions of the reviewers of the manuscripts.
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