Optimization of vibration reduction of the rubber floating-slab tracks

Jin, Hao; Zhou, Shunhua; Liu, Weining

doi:10.21595/jve.2016.17234

Cited by 8 publications

(10 citation statements)

References 14 publications

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“…F I G U R E 2 (a-c) Rubber-floating slab with different forms of rubber layer (unit: mm) [22] F I G U R E 3 Side-view of proposed High Damping Rubber (HDR) bearing of a single rubber layer without steel shims Modes 8 and 9 of the response, which resulted at natural frequencies of 386.27 and 517.13 Hz, respectively, were the last two symmetrical shape modes, where their contour plot graphs (Figure 5a,b) revealed the transition regions of zero deformation (colored in blue). The combination of the blue regions of the two shape modes created four nodal points (in red circles), which were positioned at a quarter the span of the plate from each edge (Figure 5c) and highlighted the optimum location of the HDR bearings.…”

Section: Optimal Location Of Rubber Bearingsmentioning

confidence: 99%

“…This study proposed a square‐section High Damping Rubber (HDR) bearing with a single layer of rubber designed in accordance with ISO. [ 21 ] This was based on a previous work by Jim et al, [ 22 ] which demonstrated that a point‐like rubber layer (such as square and rectangular section pads) was more effective in damping vertical vibrations than linear and full‐surface rubber layers below the floating slab when tested under railway vibrations in the laboratory (Figure 2).…”

Section: Development Of Hybrid Rubber‐concrete Isolation Slab System ...mentioning

confidence: 99%

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Hybrid rubber‐concrete isolation slab system with various shape factors for structures subjected to horizontal and vertical vibrations

Fayyadh

Hejazi

2022

Structural Design Tall Build

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Summary The present framework proposed the development of a Hybrid Rubber‐Concrete Isolation Slab System (HRCISS) to support building structures subjected to horizontal and vertical vibration due to ground motion and machine or equipment operation in the structure. Given that the effect of the shape factor on both horizontal and vertical stiffness has yet to be reported, the proposed composite system was comprised of two layers under the nodal points of the upper layer near the slab corners with four High Damping Rubber (HDR) components positioned between the slab layers to dissipate multidirectional (horizontal and vertical directions) vibrations. The ABAQUS software was utilized to model the finite element model (FEM) and simulate the HRCISS subjected to cyclic horizontal and vertical displacements. For the optimal HDR design, the model was applied in five 3‐story buildings, and the effect of distinct shape factors (0 < S < 2) of the HDR bearings—the ratio of bearing's loaded area to unloaded area (free to bulge)—within the hybrid system was evaluated. For each building with a specific HDR shape factor, the HRCISS was installed in the first, second, and third stories, separately, to investigate the influence of the installation level of the isolation system on the overall structural performance. The multistory buildings were subjected to two types of vibration loads: the interior machine‐induced vibrations, and the exterior seismic‐induced vibrations in the horizontal and vertical directions. Based on the results, the FEM results proved the significant influence of the shape factors on the dynamic response of the HRCISS under both interior and exterior 3D vibrations when applied in multistory buildings. The lateral drift of the three‐story one‐bay buildings decreased with the decrement of shape factor with buildings of HRCISS installed in 1st story recording more reduction. Moreover, the deflection in the structural slab under the HRCISS decreased for lower shape factor bearings. Nevertheless, the reduced deflection was less affected by the level of the machine‐equipped story. The rubber layer also stiffened in shear and compression directions with a higher shape factor.

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Section: Optimal Location Of Rubber Bearingsmentioning

confidence: 99%

Section: Development Of Hybrid Rubber‐concrete Isolation Slab System ...mentioning

confidence: 99%

Hybrid rubber‐concrete isolation slab system with various shape factors for structures subjected to horizontal and vertical vibrations

Fayyadh

Hejazi

2022

Structural Design Tall Build

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“…Vogiatzis and Kouroussis [ 11 , 12 ] established a finite element (FE) model for the DPFST of the Athens Metro to study and improve the vibration reduction effect (VRE) of the track system. Jin [ 13 ] combined the vehicle–floating slab-track (FST)-tunnel–soil coupled model and multi-island genetic algorithm to optimize the stiffness of rubber STMs and improve the VRE. Xin et al investigated the effect of the stiffness of STMs on the dynamic performance of the transition zone between the fixed slab track and the FST [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

Evaluation Method of the Vibration Reduction Effect Considering the Real Load- and Frequency-Dependent Stiffness of Slab-Track Mats

et al. 2021

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The purpose of this research was to investigate and improve the accuracy of the existing slab-track mat (STM) specifications in the evaluation of the vibration reduction effect. The static nonlinearity and dynamic mechanical characteristics of three types of STMs were tested, and then a modified fractional derivative Poynting–Thomson (FDPT) model was used to characterize the preload and frequency dependence. A modified vehicle–floating slab track (FST) coupled dynamic model was established to analyze the actual insertion loss. The insertion loss error evaluated by the frequency-dependent tangent stiffness increased with the increase in STM nonlinearity, and the error obtained by the third preload tangent stiffness was usually greater than that of the second preload. Compared with the secant stiffness, the second preload frequency-dependent tangent stiffness was more suitable for evaluating STMs with high-static–low-dynamics (HSLD) stiffness. In order to reflect the frequency dependence effect and facilitate engineering applications, it is recommended that second preload tangent stiffness corresponding to the natural frequency of the FST be used for evaluation. Furthermore, the insertion loss of the STMs with monotonically increased stiffness decreased as the axle load increased, and the opposite was true for the STMs with monotonically decreased stiffness. The vibration isolation efficiency of the STMs with HSLD stiffness was both stable and better than that of the STMs with monotonic stiffness.

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“…Li and Wu (2008) developed several track models to determine the vibration isolation performance of the floating slab track. An innovative idea of using recycled rubber is available in the literature dealing with the behavior of the floating slab track (Jin et al, 2017). The behavior of the floating slab track was optimized using the numerical optimization method, called the multipoint approximation method, and also using a genetic algorithm-based approach (Yan et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation on train-induced environmental vibration in floating ladder tracks

Zakeri¹,

Ebrahimi-Gholami²,

Liravi³

et al. 2020

Journal of Theoretical and Applied Mechanics

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A floating ladder track is established in the present paper as a next-generation non-ballasted track system. The three-dimensional model consists of a track (mass-spring-damping system) and the underlying soil. Rectangular pulse loading with an amplitude of 60 kN is considered as the wheel loading system. A time domain coupled finite element with a semi-infinite absorbing boundary condition is employed using FEM software. Due to axial symmetry of the model instead of the track axle, only half of the model is simulated. It is observed that the performance of the floating ladder track is better in mitigating measured vibration than that of the traditional ballasted track. Numerical results of the floating ladder track reveal that the increase of damping and stiffness yields more vibration responses, which is a straight nonlinear relationship. Although increasing density of the protective layer decreases vibrations on the ground, it has no effect on structural components of the track except for the protective layer. Furthermore, this kind of track is more effective at a closer distance to the source of vibrations.

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Optimization of vibration reduction of the rubber floating-slab tracks

Cited by 8 publications

References 14 publications

Hybrid rubber‐concrete isolation slab system with various shape factors for structures subjected to horizontal and vertical vibrations

Hybrid rubber‐concrete isolation slab system with various shape factors for structures subjected to horizontal and vertical vibrations

Evaluation Method of the Vibration Reduction Effect Considering the Real Load- and Frequency-Dependent Stiffness of Slab-Track Mats

Numerical investigation on train-induced environmental vibration in floating ladder tracks

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