Experimental investigation on loading pattern of railway concrete slabs

Sadeghi, Javad; Liravi, Hassan; Esmaeili, Morteza

doi:10.1016/j.conbuildmat.2017.07.025

Cited by 40 publications

(16 citation statements)

References 22 publications

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“…The track and rolling stock parameters conditions (provided in Table 1) were either measured in the sites or provided by the metro authorities. More details of the test sites are presented in (Sadeghi, Liravi et al 2017). Two types of sensors were used for the measurement.…”

Section: Field Measurements Proceduresmentioning

confidence: 99%

“…The stiffness of the tracks was computed using the Talbot-Wasiutynski method(Ali Zakeri and Abbasi 2012, Heydari-Noghabi, Varandas et al 2017, Sadeghi, Liravi et al 2017. For this purpose, the vertical deflections of the rail relative to the tunnel invert were measured for two different axle loads.…”

Section: Field Measurements Proceduresmentioning

confidence: 99%

“…Schematic view of the Talbot-Wasiutynski method is presented in Figure 4. Instrumentations and testing procedure were precisely designed considering the Talbot-Wasiutynski method detailed in the literature (Kerr 2000, Sadeghi, Liravi et al 2017. In each site, 3 meters of the tracks were instrumented (i.e., LVDTs were set on 5 consecutive rail seats) to obtain the pattern of the rail deflections at the rail seats positions (Figure 5-a).…”

Section: Field Measurements Proceduresmentioning

confidence: 99%

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Effectiveness of track stiffness reduction in attenuation of metro induced vibrations received by historical buildings

Sadeghi

Esmaeili

2018

Lat. Am. j. solids struct.

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Preservation of historical buildings is a main challenge in civil engineering field. One of the main concerns in this regard is metro induced vibration received by historical structures. There is a need to evaluate effectiveness of vibration mitigation measures in preservation of monumental buildings. The most widely used method of reducing metro vibrations is changes in the structure of the vibration source (not sufficiently investigated in the literature). In response to this need, effectiveness of track stiffness reduction in mitigation of vibration was investigated in this research. Comprehensive field tests were conducted in the Iranian metro lines. The track stiffness as well as the induced vibrations were measured. It was shown that track stiffness has noticeable role in the track levels of vibration, and in turn in metro vibration reduction. The amounts of vibration reduction were derived as a function of track stiffness reduction.

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Section: Field Measurements Proceduresmentioning

confidence: 99%

Section: Field Measurements Proceduresmentioning

confidence: 99%

Section: Field Measurements Proceduresmentioning

confidence: 99%

See 1 more Smart Citation

Effectiveness of track stiffness reduction in attenuation of metro induced vibrations received by historical buildings

Sadeghi

Esmaeili

2018

Lat. Am. j. solids struct.

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“…[10][11][12][13][14][15] Nowadays, slab track superstructure is used widely compared to the ballasted one by dint of its advantages. 16 Although a review of the literature related to the ballasted tracks indicates that rail irregularity and rail pad stiffness have the most effects on the wheel/ rail force, very few works have been carried out on the effect of rail pad stiffness on the wheel/rail force in slab track. For instance, Heydari-Noghabi et al 17 simulated the vehicle/slab track interaction using a two-dimensional (2D) numerical model.…”

Section: Introductionmentioning

confidence: 99%

Effect of rail pad stiffness on the wheel/rail force intensity in a railway slab track with short-wave irregularity

Khajehdezfuly

2019

Proceedings of the Institution of Mechanical Engineers, Part F:

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In this paper, a two-dimensional numerical model is developed to investigate the effect of rail pad stiffness on the wheel/rail force in a slab track with harmonic irregularity. The model consists of a vehicle, nonlinear Hertz spring, rail, rail pad, concrete slab, resilient layer, concrete base, and subgrade. The rail is simulated using the Timoshenko beam element for considering the effects of high-frequency excitation produced by short-wave irregularity. The results obtained from the model are compared with those available in the literature and from the field to prove the validity of the model. Through a parametric study, the effect of variations in rail pad stiffness, vehicle speed, and harmonic irregularity on the wheel/rail force is investigated. For the slab track without any irregularity, the wheel/rail force is at maximum when the vehicle speed reaches the critical speed. As the rail pad stiffness increases, the critical speed increases. When the amplitude of irregularity is high, wheel jumping phenomenon may occur. In this situation, as the vehicle speed and rail pad stiffness are increased, the dynamic wheel/rail force is increased. In the low-frequency range, the wheel/rail force increases as the rail pad stiffness increases. In the high-frequency range, the wheel/rail force increases as the rail pad stiffness is decreased.

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“…Labibzadeh et al (2017b) implemented a modified version of CDP model in an innovative inverse method to evaluate the long-term behavior of an aged concrete structure. Sadeghi et al (2017) conducted a research on the mechanism of transfer of load from railway to concrete slab support and improved the current practice of design of such slabs using CDP with a nonlinear model.…”

Section: Introductionmentioning

confidence: 99%

Effect of Stress Path, Size and Shape on the Optimum Parameters of a Brittle-Ductile Concrete Model

Labibzadeh

Hamidi

2017

Engineering Structures and Technologies

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The main purpose of this study is to investigate the effects of the stress path, size and shape of the specimen, on the optimum values of the plastic input parameters of Concrete Damaged Plasticity-CDP- model of the ABAQUS software. This study concentrates on eccentricity, dilatation angle and viscosity input parameters. To finding optimum values of the mentioned parameters, an objective function which estimates the error of the model predictions was defined and tried to minimize. For evaluating the effect of the stress path on this optimization procedure, four different standard tests were simulated by the ABAQUS software: uniaxial compression, dual compression, dual-border cut specimen and three-point bending tests. For studying the effect of the size of the specimen, the three-point bending test, with three different sizes of the beam were modeled in the ABAQUS software. Furthermore, for investigating the effect of the specimen shape on the input parameters, a notched disk in a tensile stress field was modeled. Obtained results demonstrated that the path of the stress can influence significantly on the optimum values of the input parameters, while it was revealed that the CDP model can automatically take into account the size and shape effects in the simulation.

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Experimental investigation on loading pattern of railway concrete slabs

Cited by 40 publications

References 22 publications

Effectiveness of track stiffness reduction in attenuation of metro induced vibrations received by historical buildings

Effectiveness of track stiffness reduction in attenuation of metro induced vibrations received by historical buildings

Effect of rail pad stiffness on the wheel/rail force intensity in a railway slab track with short-wave irregularity

Effect of Stress Path, Size and Shape on the Optimum Parameters of a Brittle-Ductile Concrete Model

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