A 2.5D Finite Element Approach for Predicting Ground Vibrations Generated by Vertical Track Irregularities

Bian, Xuecheng; Chao, Chen; Jin, Wan-feng; Chen, Yunmin

doi:10.1007/978-981-10-5610-9_12

Cited by 6 publications

(6 citation statements)

References 18 publications

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“…Other researchers modelled the railway track as 2.5D to reduce simulation computational time [116][117][118][119][120]. The 2.5D is used to model the geometry of the track as two dimensional while considering for three-dimensional load cases.…”

Section: Model Dimensionmentioning

confidence: 99%

Geomechanical Modelling of Railroad Ballast: A Review

Alabbasi

Hussein

2019

Arch Computat Methods Eng

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Traditional ballasted tracks have been used intensively around the world with ballast as the main material for tracks. Ballast has a significant contribution to the track alignment, stability and sustainability. After service, ballast deforms and degrades. Periodic ballast maintenance is needed which is a time and cost expensive activity. Understanding the mechanical behaviour of railroad ballast leads to better design and efficient maintenance. From the literature, there are two main approaches used to understand the mechanical behaviour of railroad ballast; large scale experimental and modelling. This paper aims to review the state of the art of literature on the modelling approaches used to understand ballast mechanical behaviour. It discusses the key findings from each modelling approach in understanding ballast mechanical behavior. It presents the main concerns and limitations of each modelling approach from different perspectives related to ballast modelling. It summarizes the limitations, gaps and gaps’ developments of the researches used to understand ballast behaviour via modelling approach.

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Section: Model Dimensionmentioning

confidence: 99%

Geomechanical Modelling of Railroad Ballast: A Review

Alabbasi

Hussein

2019

Arch Computat Methods Eng

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“…erefore, its computational efficiency is greatly improved. Previous works have applied 2.5-D FEM for solving the problems related to highspeed railway and soil foundation [26][27][28][29][30]. In particular, Yang and Hung applied the 2.5-D method to analyze environmental vibration control for high-speed railway [26].…”

Section: Introductionmentioning

confidence: 99%

Prediction of Viscoelastic Pavement Responses under Moving Load and Nonuniform Tire Contact Stresses Using 2.5-D Finite Element Method

Wang

Zhao

et al. 2020

Mathematical Problems in Engineering

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This study developed two-and-half dimensional (2.5-D) finite element method (FEM) to predict viscoelastic pavement responses under moving loads and nonuniform tire contact stresses. The accuracy of 2.5-D FEM was validated with two analytical solutions for elastic and viscoelastic conditions. Compared to three-dimensional (3-D) FEM, the computational efficiency of the 2.5-D method was greatly improved. The effects of loading pattern and speed on pavement surface deflection and strain responses were analyzed for asphalt pavements with four different asphalt layer thicknesses. The analyzed pavement responses included surface deflections, maximum tensile strains in the asphalt layer, and maximum compressive strains on top of subgrade. The loading patterns have influence on the mechanical responses. According to the equivalent rule, the point load, rectangle type, and sinusoid-shape contact stresses were studied. It was found that the point load caused much greater pavement responses than that of the area-based loading. When the tire loading was simplified as uniform contact stress in rectangular area, the maximum tensile strains in the asphalt layer varied with the width/length ratio of contact area. Additionally, it was shown that the dynamic responses of pavement structure induced by the sinusoid-shape contact stresses and realistic nonuniform stresses were quite similar to each other in all the cases. The pavement strain responses decreased as the speed increased due to viscoelastic behavior of asphalt layer. The study results indicate that asphalt pavement responses under moving load can be calculated using the proposed 2.5-D FEM in a fast manner for mechanistic-empirical pavement design and analysis.

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“…It was presented 8 that capturing the hidden effects that are not obtained by 2D models due to variations in the geometric and material properties of the soil–structure system; a full 3D finite element modeling may still be necessary. 8 Yang and Hung 9 represented the soil–tunnel interaction system to study the impact of soil layers, assuming the material and geometry properties of the soil–tunnel system to be uniform along the load-moving direction. Also, they analyzed the case of a tunnel embedded in a uniform viscoelastic half-space, with or without bedrock, subjected to an underground moving train with a speed of 108 km/h.…”

Section: Introductionmentioning

confidence: 99%

Influence of rubber pads on vibration levels and structural behavior of subway tunnels

Khalil

Metwally

Ahmed

2020

Journal of Low Frequency Noise, Vibration and Active Control

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The principal aim of this paper is to analyze the impact of rubber pad systems on levels of vibrations and values of stresses and deformations induced in the subway tunnel segments. Thus, the 3D model has been selected to be isotropically simulated in the ANSYS program to conduct a finite element analysis. Therefore, the proposed track system in the tunnel of line 4 of the Greater Cairo Metro has been selected as an analytical and simulation case study. The impact of using eight different values for the stiffness of the rubber pad system in the case of a single tunnel has been analyzed. The results showed that levels of vibrations are significantly affected and are in logarithmic correlation with the stiffness. Also, the impact of the stiffness on the deformations and stresses are determined as well as mathematical models connecting the different parameters have been introduced.

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A 2.5D Finite Element Approach for Predicting Ground Vibrations Generated by Vertical Track Irregularities

Cited by 6 publications

References 18 publications

Geomechanical Modelling of Railroad Ballast: A Review

Geomechanical Modelling of Railroad Ballast: A Review

Prediction of Viscoelastic Pavement Responses under Moving Load and Nonuniform Tire Contact Stresses Using 2.5-D Finite Element Method

Influence of rubber pads on vibration levels and structural behavior of subway tunnels

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