Development of the northeast extreme tee (NEXT) beam for accelerated bridge construction

This thesis details a study of the structural behavior of Hybrid-Composite Beams (HCB) consisting of a fiber reinforced polymer (FRP) shell with a concrete arch tied with steel prestressing strands. The HCB offers advantages in life cycle costs through reduced transportation weight and increased corrosion resistance. By better understanding the system behavior, the proportion of load in each component can be determined, and each component can be designed for the appropriate forces. A long term outcome of this research will be a general structural analysis framework that can be used by DOTs to design HCBs as rapidly constructible bridge components. This study focuses on identifying the load paths and load sharing between the arch and FRP shell.Testing was performed by applying point loads on simple span beams (before placing the bridge deck) and a three beam skewed composite bridge system. Curvature from strain data is used to find internal bending forces, and the proportion of load within the arch is found. Additionally, a stress integration method is used to confirm the internal force contributions. The tied arch carries about 80% of the total load for the non-composite case without a bridge deck. When composite with a bridge deck, the arch has a minimal contribution to the HCB stiffness and strength as it is below the neutral axis. For this composite case the FRP shell and prestressing strands resist about 85% of the applied load while the bridge deck carries the remaining 15% to the end diaphragms and bearings.iii

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“…Using lightweight concrete in the members can reduce shipping costs and possibly increase available span lengths (Culmo and Seraderian 2010 …”

Section: Accelerated Bridge Constructionmentioning

confidence: 99%

Experiments on a Hybrid-Composite Beam for Bridge Applications

Nosdall

Moen

Cousins

et al. 2013

Transportation Research Record: Journal of the Transportation R

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“…In recent years, the Precast/Prestressed Concrete Institute (PCI) northeast in the US developed a new beam section, called as NEXT beam, for the purpose of accelerating bridge construction process [1,2]. A NEXT beam consists of two beam stems spaced at 1.524 m (5 ft) on centers, as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

“…A NEXT beam consists of two beam stems spaced at 1.524 m (5 ft) on centers, as shown in Fig. 1 [1,2]. The beam depth varies from 0.610 m (24 in) to 0.914 m (36 in) with 0.102 m (4 in) increments.…”

Section: Introductionmentioning

confidence: 99%

Skew Reduction Factors for Moment in NEXT Beam Bridges with Integral Abutments

Huang

Davis

2018

AMM

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Northeast Extreme Tee (NEXT) beams have been recently developed for the accelerated bridge construction. The skew effect on live load distribution in a NEXT beam bridge, especially with integral abutments, is not clear and shall be assessed. In this paper, various skew NEXT beam bridges are evaluated through validated finite element (FE) analyses with solid brick elements. Parameters as studied include beam section, span length, and skew angle. Per AASHTO LRFD specifications, one- and two-lane loaded cases are examined to obtain the maximum tensile strains in beam stems under the design live loading (HL-93). Unskewed bridges are used as control specimens to compute skew reduction factors (SRF) for moment from the obtained FE strains. The FE- and LRFD-SRFs for moment are compared in terms of figures, which indicate the LRFD-SRFs have good agreements with the FE-SRFs at large. For the majority of the bridges, LRFD-SFRs govern the FE-SRFs. The research findings from this paper are useful for practicing engineers to safely design a skew NEXT beam bridge with integral abutments.

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“…Precast Adjacent Box Girders This type of system consists of precast beams with an integral deck separated by a closure joint, eliminating the need to form and pour a concrete deck on the site [6]. There are multiple shapes for these girders: in the form of a rectangular prism, which is an ideal choice for short-span bridges [25]; in the form of a trapezoid, which can be a closed or open box and has the advantage of spanning the entire bridge with a reduced number of girders compared to other box girders [26]; and a box girder with an integral deck that uses post-tensioning and has the advantage of having a low height, allowing for its use for sites with limited clearance [25].…”

mentioning

confidence: 99%

“…The first is the NEXT F beam, where the top flange is used to support a cast-in-place reinforced concrete deck, and the second type is the NEXT D beam consisting of a precast integral deck [29]. The system has the advantages of being satisfactory for projects with clearance limitations and having a higher load capacity than standard double-T and box girders [5,25].…”

mentioning

confidence: 99%

Review of Accelerated Bridge Construction Systems for Bridge Superstructures and Their Adaptability for Cold Weather

Aurier

Hassan

Jaworski³

et al. 2023

CivilEng

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The application of Accelerated Bridge Construction methods (ABC) to build, renovate and rehabilitate aging bridges is most likely to reduce the economic and social impacts of projects. This is especially relevant in countries with severe winter climates, where bridge construction is typically interrupted during the winter period. The objective of this study is to present the state of the art related to elements, systems, connections and materials used for bridge superstructures in ABC projects and to highlight their adaptability to cold or northern climate countries. The literature review and presentation of results are based on the gathering of Prefabricated/Precast Bridge Elements and Systems (PBES) used for ABC projects in North America and which are also used in many countries around the world. Following this inventory, and after grouping the PBES, connections and materials, the authors were able to identify the possibility of adapting the ABC method for countries with cold and northern climates. Products that can be used down to −6 °C for connections are presented, and future research orientations are proposed.

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Development of the northeast extreme tee (NEXT) beam for accelerated bridge construction

Cited by 12 publications

References 0 publications

Experiments on a Hybrid-Composite Beam for Bridge Applications

Experiments on a Hybrid-Composite Beam for Bridge Applications

Skew Reduction Factors for Moment in NEXT Beam Bridges with Integral Abutments

Review of Accelerated Bridge Construction Systems for Bridge Superstructures and Their Adaptability for Cold Weather

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