Far-Field Earthquake Responses of Overhead Line Equipment (OHLE) Structure Considering Soil-Structure Interaction

Ngamkhanong, Chayut; Kaewunruen, Sakdirat; Baniotopoulos, Charalampos

doi:10.3389/fbuil.2018.00035

Cited by 12 publications

(6 citation statements)

References 15 publications

(14 reference statements)

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“…It was clearly shown that the placement of the viscous dampers plays an important role in reducing the acceleration response. In addition, the optimal damping effect can be achieved by optimizing the parameters of the viscous dampers, similar to other researches [30][31][32][33][34].…”

Section: Appl Sci 2019 9 X For Peer Reviewmentioning

confidence: 75%

Shaking Table Tests of Suspended Structures Equipped with Viscous Dampers

Cai

Kaewunruen

2019

Applied Sciences

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In this study, a series of shaking table tests of a ten storey concrete suspended structure equipped with viscous dampers were carried out to evaluate the dynamic responses and vibration damping performance of suspended structures. The effects of link types between the primary structure and suspended floors and different seismic excitations on the response of suspended structure models was verified. The responses include the damping ratio, the frequency, maximum relative displacements, accelerations and maximum strains of the suspended structures. Test results showed that the damping ratio and the frequency of suspended structures installed with dampers (called damping suspended structure) are adjusted compared with a conventional suspended structure with rigid-bar links (conventional suspended structure). Maximum relative displacements of the primary structure of the damping suspended structure were distinctly smaller than those of the conventional suspended structure. However, the maximum relative displacement between the primary structure and the suspended floors of the damping suspended structure was significantly larger than that of the conventional structure, indicating that the swing of the suspended floor can help dissipate seismic energy. The peak acceleration and acceleration amplification factors of the damping suspended structure were less than the conventional suspended structure. Moreover, the peak acceleration response of the damping suspended structure was slightly behind the conventional suspended structure. The damping suspended structure certainly had a considerable and stable reduction for strain response, and the maximum strain response was decreased by 42.3%–72.7% for the damping suspended structure compared with the conventional suspended structure.

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Section: Appl Sci 2019 9 X For Peer Reviewmentioning

confidence: 75%

Shaking Table Tests of Suspended Structures Equipped with Viscous Dampers

Cai

Kaewunruen

2019

Applied Sciences

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“…A is the roughness constant ( As the most efficient infinite boundary, perfectly matched layers (PML) method is used to prevent spurious wave reflections from the truncated boundary [32,33,34,35,36,37]. while the left side of ground has the same mesh but with ground soils inside.…”

Section: Modeling Of the High-speed Train And Slab Trackmentioning

confidence: 99%

Seismic metamaterial barriers for ground vibration mitigation in railways considering the train-track-soil dynamic interactions

Kaewunruen

2020

Construction and Building Materials

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With the rapid development of high speed rail system, ground vibration mitigation solutions are desperately needed. Based on the concepts of phononic crystals, seismic metamaterial, which is a novel vibration mitigation method, can theoretically yield excellent performance in shielding dynamic propagation waves in broad frequency bands. However, the application of seismic metamaterials in railway-induced vibration mitigation is a recent and ongoing topic. Therefore, this study aims to create new contribution towards a better understanding into the mitigation effects by seismic metamaterials for railway-induced ground vibrations. The seismic metamaterials are made of an array of concrete inclusions in this study. The dispersion theory for seismic metamaterials is proposed for analyzing the theoretical band gaps. A 3D coupled train-track-soil interaction model is also developed based on the multi-body simulation principle, finite element theory, and perfectly matched layers method using LS-DYNA. The dimensions of seismic metamaterials are determined based on the dominant frequencies of vibration accelerations in natural ground. When the seismic metamaterials are adopted in railway ground, the vibration responses are investigated in both time and frequency domains to illustrate the mitigation effects. Finally, the numbers of inclusions, initial distances, and train speeds are changed to investigate their influences on shielding effects. The insight from this study provides a new and better understanding of attenuating ground vibrations using seismic metamaterials in high speed railways.

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“…Special thanks to European Commission for H2020-MSCA-RISE Project No. 691135 "RISEN: Rail Infrastructure Systems Engineering Network" (www.risen2rail.eu) [43]. In addition, the collaboration and assistance from EU Cost Action TU1404 (Towards the next generation standards for service life of cement-based materials and structures) is highly appreciated.…”

Section: Acknowledgmentsmentioning

confidence: 99%

Experimental Investigations into Earthquake Resistance of Steel Frame Retrofitted by Low-Yield-Point Steel Energy Absorbers

et al. 2019

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This paper is the world’s first to highlight an experimental investigation into the earthquake responses of a steel frame retrofitted by novel metallic bending energy absorbers made of low-yield-point steel with the yield strength of approximately 100 MPa. New results have been achieved by conducting comprehensive shaking table tests on a quarter-scaled model of a two-story, one-span building structure subjected to incremental intensity levels of input earthquake records. The detailed information of the specimens, material properties, monitoring sensors, and dynamic loading mechanisms has been presented. The experimental results in terms of seismic phenomena, dynamic characteristics, acceleration, inter-story drift ratios, and strain distributions are also analyzed by the data collected from a wide range of sensors. It is found that the seismic failure of the specimens depends largely on the energy absorbers, which dissipate the majority of seismic input energy in order to prevent the parent steel frame from being damaged by a severe earthquake. In addition, the retrofitted structure sufficiently satisfies the design criteria considering allowable drift limits under both frequent and rare earthquakes. This indicates the influential role of the novel low-yield-point absorber, in that the overall seismic performance of the retrofitted structure can be improved adequately for survival in high-intensity seismic fortification areas.

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Far-Field Earthquake Responses of Overhead Line Equipment (OHLE) Structure Considering Soil-Structure Interaction

Cited by 12 publications

References 15 publications

Shaking Table Tests of Suspended Structures Equipped with Viscous Dampers

Shaking Table Tests of Suspended Structures Equipped with Viscous Dampers

Seismic metamaterial barriers for ground vibration mitigation in railways considering the train-track-soil dynamic interactions

Experimental Investigations into Earthquake Resistance of Steel Frame Retrofitted by Low-Yield-Point Steel Energy Absorbers

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