Analytical solution on highway U-shape bridges using isotropic plate theory

Xiong, Wen; Cai, C.S.; Jian-shu, YE; Ma, Ying

doi:10.1007/s12205-015-0610-y

Cited by 5 publications

(1 citation statement)

References 10 publications

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“…The U-shaped viaduct concept was initially proposed by SYSTRA in 1992-93 for Santiago Chile [11]. The U-shaped bridge (also known as a half-through or channel bridge) is made of reinforced concrete and prestressed in the longitudinal direction [12,13]. Furthermore, due to economic considerations, state Departments of Transportation (DOTs) have shown a preference for reducing the number of girders.…”

Section: Introductionmentioning

confidence: 99%

Cost Optimization of Prestressed U-Shaped Simply Supported Girder Using Box Complex Method

et al. 2023

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The use of U-shaped girders has become increasingly popular in advanced projects such as metro rail systems due to their ability to provide greater vertical clearance beneath bridges. These girders, characterized by two webs and a bottom flange, contribute essential longitudinal stiffness and strength to the overall structure while effectively countering torsional forces in curved bridges. However, the design and construction of U-shaped girders present challenges, including their relatively higher self-weight compared to other girder types. Consequently, cost optimization has become a crucial focus in structural design studies. This research aims to develop an optimization model for prestressed U-shaped girders using the AASHTO LRFD bridge design specifications. The model is based on the Box complex method, with necessary modifications and improvements to achieve an optimal design. The objective is to minimize the total cost of materials, including concrete, steel reinforcement, and prestressing strands, while satisfying explicit and implicit design constraints. To facilitate the analysis, design, and optimization processes, a program is developed using Visual Studio 2010 and implemented in Visual Basic (VB.NET). The program incorporates separate subroutines for analysis, design, and optimization of the prestressed U-shaped girder, which are integrated to produce the desired results. When running the program, the optimization process required 229 iterations to converge to the optimal cost function value. The results demonstrate that the developed algorithm efficiently explores economically and structurally effective solutions, resulting in cost savings compared to the initial design. The convergence rate of the moment capacity constraint is identified as a key factor in achieving the optimal design. This research makes a significant contribution to the field of civil engineering by applying the classical Box complex method to the optimization of girders, an area where its utilization has been limited. Furthermore, this study specifically addresses the optimization of prestressed U-shaped girders in metro rail projects, where they serve as both the deck and support structure for train loading. By employing the Box complex method, this research aims to fill the research gap and provide valuable insights into the optimization of U-shaped girders. This approach offers a fresh perspective on designing these girders, considering their unique role in supporting metro rail loads. By leveraging the benefits of the Box complex method, researchers can explore new possibilities and uncover optimal design solutions for U-shaped girders in metro rail applications.

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Section: Introductionmentioning

confidence: 99%

Cost Optimization of Prestressed U-Shaped Simply Supported Girder Using Box Complex Method

et al. 2023

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Experimental and analytical behavior of a new type of concrete‐filled steel tube tied‐arch bridge with trough girder

Shen

Xing

et al. 2018

Stahlbau

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Trough girders are widely accepted in engineering on account of lowing construction depth and protection against traffic noise pollution, but most of them are used for simple‐supported girder bridges with a span of generally less than 30 m. On the railway line of Nanjing–Qidong in China a new railway bridge will be built which has a span of over 64 m but a construction depth of less than 2.4 m on which Shanghai–Nantong railway line is also passed, so the type of concrete‐filled steel tube tied‐arch bridge with trough girder was chosen. For such a new structure hardly used in engineering, there are no research results yet available about mechanical properties of the structure. This paper therefore makes for the bridge an experimental model of 1:4 geometric scale in order to test mechanical properties under operation load, cracking load, and ultimate load such as cracking diagram, load‐carrying capacity, stress distribution, and failure mechanism. According to the experimental results, when the model is subjected to longitudinal bending moment, the failure mode is similar to that of pure bending of a girder, and when the model is subjected to transverse bending moment failure mode behaves like the flexural failure mode of the traditional reinforced concrete structure. A non‐linear element analysis is also made on the model with the results in good agreement with that of the experiment. The same modeling method is applied to the finite element analysis of the real bridge, considering various load in design. In the analysis, it is finally verified that this new type of bridge meets specification requirements in strength, rigidity, and resistance to cracking.

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Mechanical Properties of Prestressed Concrete Trough Girder: Full-Scale Experiment and Nonlinear FE Analysis

Yuan,

Yang,

Wang

et al. 2024

KSCE J Civ Eng

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Analytical solution on highway U-shape bridges using isotropic plate theory

Cited by 5 publications

References 10 publications

Cost Optimization of Prestressed U-Shaped Simply Supported Girder Using Box Complex Method

Cost Optimization of Prestressed U-Shaped Simply Supported Girder Using Box Complex Method

Experimental and analytical behavior of a new type of concrete‐filled steel tube tied‐arch bridge with trough girder

Mechanical Properties of Prestressed Concrete Trough Girder: Full-Scale Experiment and Nonlinear FE Analysis

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