Comparison of vibration and noise characteristics of urban rail transit bridges with box-girder and U-shaped sections

Li, Qi; Dai, Baorui; Zhu, Zhihui; Thompson, D.J.

doi:10.1016/j.apacoust.2021.108494

Cited by 16 publications

(4 citation statements)

References 31 publications

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“…As a kind of beam bridge structure widely used in practical engineering, U-beam bridges have the advantages of lower structure height and excellent anti-noise performance compared with box-beam bridges because of their unique structural characteristics [1,2]. U-beam bridges have become one of the important forms of railway and urban rail bridges.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Mechanical Behavior and Joint Shear Capacity Optimization of Glued Keys in Segmental U-Shaped Bridges

Yang,

Zhang,

Liang

et al. 2024

Buildings

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This paper presents an in-depth analysis of the mechanical behavior and joint shear capacity optimization of segmental U-shaped bridges, with a focus on the application of precast segmental techniques in the construction of U-beam bridges widely used in urban rail transit networks. This study further explores the roles of key position distribution and size in the overall stability and service behavior of such structures. Considering the critical case study of the Colombia Bogotá Metro Line 1 project, finite element modeling was carried out using ABAQUS 6.14 to simulate concrete material behaviors and to evaluate the stress–strain relationship in accordance with the concrete plastic damage model and existing standards. This research identifies the significant contribution of keys in minimizing deformation and enhancing shear capacity, demonstrating the pivotal influence of shear key design on the mechanical behavior of segmental bridges. By calculating the shear capacity under different cases, this study provides recommendations on key distributions and dimensions that optimize joint shear capacities, indicating that augmenting key size within the web plate section decisively reinforces the bridge’s mechanical resilience.

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Section: Introductionmentioning

confidence: 99%

Analysis of the Mechanical Behavior and Joint Shear Capacity Optimization of Glued Keys in Segmental U-Shaped Bridges

Yang,

Zhang,

Liang

et al. 2024

Buildings

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“…Liang et al [20] studied the vibration and noise of a long-span steel truss cable-stayed bridge laid with damping pads, and the bridge noise was tested to reduce noise by 10~13 dB(A). Li et al [21] compared the radiation noise of U-shaped, single-box, and double-box girder bridges, and the radiation noise of the single and double box-girder bridges was 8.6 and 11.7 dB lower than that of the U-shaped beam bridge. Harrison et al [22] studied panel acoustic contributions of a steel-concrete bridge with a SEA model considering the roughness of the wheel-rail interface, and the noise reduction measure by optimizing the bridge structure was proposed.…”

Section: Introductionmentioning

confidence: 99%

Bridge-Borne Noise Induced by High-Speed Freight Electric Multiple Units: Characteristics, Mechanisms and Control Measures

Du,

Wang,

et al. 2024

Applied Sciences

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The high-speed freight electric multiple unit (EMU) is one of the important development directions for railway freight transportation. To investigate the bridge radiation noise induced by the freight EMU, a noise prediction model consisting of the containers–vehicle–track–bridge dynamic model, finite element model, and boundary element model are established and validated. Through simulation, the bridge radiation noise under different train loading conditions is compared, and the noise radiation mechanism is revealed. Moreover, the noise reduction effect of the noise wall is studied, and the influences of noise wall heights and sound absorption materials are investigated. Results indicate that the bridge sound power and the sound pressure levels (SPLs) of near-field points increase slightly with train loads in the frequency range below 20 Hz and above 125 Hz, with a maximum increase of about 6.8 dB. The structure resonance, intense local vibration, and high acoustic radiation efficiency cause strong bridge radiation noise. The noise wall can realize a good overall noise reduction effect in the sound shadow zone; nevertheless, SPLs increased in areas between the bridge and the noise wall. The ground reflection affects the superposition of transmitted, reflected, and diffracted sound waves, which causes nonlinear relationships of noise reduction effects with the noise wall height. From the perspective of human hearing sensitivity, the loudness levels of typical field points increase with the frequency in the range of 20~80 Hz, and SPLs below 25 Hz are less than the threshold of hearing. Setting the noise wall can effectively reduce the loudness levels, and the reduction effect increases with the noise wall height.

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“…The U-shaped viaduct has many advantages, such as the level of rail, which can be reduced due to the distance between the bottom of the flange and the rail, which results in savings in the foundation and station design. The visual effect is in the side webs acting as a noise barrier and the capability of retaining the rail on the bridge in case of such unfavorable conditions as severe earthquakes [11,[15][16][17][18]. A prestressed U-shaped girder is an innovative and creative concept in metro rail bridge structure design.…”

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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Comparison of vibration and noise characteristics of urban rail transit bridges with box-girder and U-shaped sections

Cited by 16 publications

References 31 publications

Analysis of the Mechanical Behavior and Joint Shear Capacity Optimization of Glued Keys in Segmental U-Shaped Bridges

Analysis of the Mechanical Behavior and Joint Shear Capacity Optimization of Glued Keys in Segmental U-Shaped Bridges

Bridge-Borne Noise Induced by High-Speed Freight Electric Multiple Units: Characteristics, Mechanisms and Control Measures

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

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