Analysis of the influence of support positions in transition zones. A numerical analysis

Sañudo, Roberto; Cerrada, Mikel; Alonso, Borja; dell’Olio, Luigi

doi:10.1016/j.conbuildmat.2017.03.204

Cited by 20 publications

(19 citation statements)

References 7 publications

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“…The initial development was based on 2D dynamic simulations (explained in Section 3 ). The initial models developed for the Dinatrans solution and an in-depth description can be found in [ 4 , 24 , 25 , 26 , 27 ], respectively.…”

Section: The Case Studymentioning

confidence: 99%

“…The ballast thickness is constant, so variation in track stiffness is due to rails with variable length, variable sleeper length, and variable pad stiffness. To achieve this, six configurations of sleepers (with variable length), and six different configuration of rails, inner and outer rails were previously numerically analyzed in [ 4 , 26 , 27 , 28 ]. The best solution was the one with length of inner rails 22.8 m and outer rails 18 m. This solution makes the track transition in vertical settlements and vertical stresses more gradual.…”

Section: The Case Studymentioning

confidence: 99%

“…The authors decided to focus on vertical displacements in rails and sleepers, vertical accelerations on sleepers, and stress in ballast. These variables were selected based on previous research and a state-of-the-art analysis [ 4 , 25 , 26 , 27 , 28 ]. When the field measurement program was designed, stress in ballast was difficult to obtain so the authors decided to measure shear stress in rails.…”

Section: The Case Studymentioning

confidence: 99%

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Monitoring Track Transition Zones in Railways

Sañudo

Jardí²,

Martinez³

et al. 2021

Sensors

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This manuscript presents the first measurement program and data collection on the Dinatrans track transition solution after it was installed in a track section in the north of Spain (Galicia). The Dinatrans solution was created to address the limitations of several track transition solutions. This novel solution consists of two inner and outer rails from slab track to ballast track, pads with different stiffness over sleepers of variable lengths installed from ballast track to slab track, and a simple substructure formed by non-structural concrete poured over the natural ground. The main objective of this research was to assess the suitability and the initial performance of the Dinatrans track transition solution. The measured variables for these initial real-world tests were vertical accelerations on sleepers, shear stress on rails, vertical displacements on rails and vertical displacements on sleepers. All measurements of these variables were obtained in an in-situ program by installing vertical accelerometers and LVDTs on the track structure and extensometer gauges on the rails and sleepers. The methodology and the procedures followed are described. The Dinatrans initial solution was compared with the Standard solution used in Spain using these initial measurements. This field analysis provides an initial understanding of the performance of the new track transition. Further measurements will be required to check the track transition performance over the long term; however, no maintenance works have been necessary since construction (2016).

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Section: The Case Studymentioning

confidence: 99%

Section: The Case Studymentioning

confidence: 99%

Section: The Case Studymentioning

confidence: 99%

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Monitoring Track Transition Zones in Railways

Sañudo

Jardí²,

Martinez³

et al. 2021

Sensors

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“…bridges, tunnels) on a Spanish railway line to calculate the vertical stiffness value of each point and cross-section designs were proposed to control the variations. Sañudo, Cerrada, Alonso, and dell'Olio (2017) considered a ballasted-slab track connection and investigated the optimal spacing of sleepers at the junction. Shahraki, Warnakulasooriya, and Witt (2015) assessed the behaviour of different transition zones when using longer sleepers, auxiliary rails, and improved subgrade.…”

Section: Short-term Performance Evaluationmentioning

confidence: 99%

Systems thinking approach for improving maintenance management of discrete rail assets: a review and future perspectives

Shang

Macho

Wang

et al. 2021

Structure and Infrastructure Engineering

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Performance evaluation and maintenance planning are gaining importance with ageing rail infrastructure and increasing demand on track safety and continuous availability. The discrete/point railway assets (e.g. bridges, level crossings) together with extended track sections constitute the main railway network infrastructure. The former has important implications in train safety, riding comfort and operating expenditures due to local intensified degradation and plays a role in effective network capacity due to their large quantity. The heterogeneity in asset features and operating environment also adds difficulties to efficient maintenance planning of multiple discrete assets. The current review screens the issue to level crossings, as little concern has been engaged to this asset type, and draws together different perspectives related to their maintenance management. The systems thinking approach is integrated and two levels of asset management (i.e. micro-and macro-level) are used to structure the synthesis, which are interdependent and synergistic. Two major approaches, namely, the mechanistic and data-driven modelling are synthesised. Both contribute to the maintenance knowledge and their comparisons are elaborated. Limitations in existing studies are identified and directions for future research are provided, aiming to contribute to a more refined 'inspection and diagnosis' process to properly capture the local track issues and move towards system-level maintenance approach for multiple level crossings.

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“…A transition zone, which is the section between a ballasted track and a slab track, or more specifically, the section on both sides of a concrete bridge slab in a ballasted track, is required to be designed and installed [ 80 ], One of the secondary applications of the asphalt is that it is an ideal material that can be applied in transition zones to restrict permanent settlement [ 81 , 82 ], increase the track modulus, and overcome the stiffness differences [ 83 ]. between the ballast and bridge’s or tunnel’s concrete deck.…”

Section: Review Of Case Studiesmentioning

confidence: 99%

A Review of Different Aspects of Applying Asphalt and Bituminous Mixes under a Railway Track

et al. 2020

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Asphalt is a common material that is used extensively for roadways. Furthermore, bituminous mixes have been used in railways, both as asphalt and as mortar. Different agencies and research institutes have investigated and suggested various applications. These studies indicate the benefits of bituminous material under railways, such as improving a substructure’s stiffness and bearing capacity; enhancing its dynamic characteristics and response, especially under high-speed train loads; waterproofing the subgrade; protecting the top layers against fine contamination. These potential applications can improve the overall track structure performance and lead to minimizing settlement under heavy loads. They can also guarantee an appropriate response under high-speed loads, especially in comparison to a rigid slab track. This review paper documents the literature related to the utilization of asphalt and bituminous mixes in railway tracks. This paper presents a critical review of the research in the application of asphalt and bituminous mixes in railway tracks. Additionally, this paper reviews the design and construction recommendations and procedures for asphalt and bituminous mixes in railway tracks as practiced in different countries. This paper also provides case studies of projects where asphalt and bituminous mixes have been utilized in railway tracks. It is anticipated that this review paper will facilitate (1) the exchange of ideas and innovations in the area of the design and construction of railway tracks and (2) the development of unified standards for the design and construction of railway tracks with asphalt and bituminous mixtures.

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Analysis of the influence of support positions in transition zones. A numerical analysis

Cited by 20 publications

References 7 publications

Monitoring Track Transition Zones in Railways

Monitoring Track Transition Zones in Railways

Systems thinking approach for improving maintenance management of discrete rail assets: a review and future perspectives

A Review of Different Aspects of Applying Asphalt and Bituminous Mixes under a Railway Track

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