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

Sadeghi, Javad; Esmaeili, Morteza

doi:10.1590/1679-78255252

Cited by 18 publications

(6 citation statements)

References 24 publications

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“…Considering the large running speed of the centrifuge, the sensor (Figure 9) used in the centrifuge model test is an ideal noncontact high-precision laser displacement sensor (Wenglor YP11MGVL80), with a range of 50 mm and an accuracy of 20 μm. Sadeghi and Esmaeili et al [28][29][30] gave a detailed introduction to the specifications of more test measuring instruments.…”

Section: Test Setupmentioning

confidence: 99%

Investigation on the Settlement of High Rockfill Embankment Using Centrifuge Tests

et al. 2021

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To study the deformation behavior of the high rockfill (HRF) embankment during construction and operation, based on more than a 50-m high rockfill embankment of the second-class road reconstruction project from Xunyang to Ankang of the national road 316 in Shaanxi, China, the centrifuge model test was performed to study the deformation laws of HRF embankment. The test results showed the following: (i) the HRF embankment was stable during construction and operation; (ii) during construction, the settlement occurred at the embankment top, and uplift occurred at the slope foot. Moreover, the deformation at the top was greater than that at the slope foot, and the deformations at both the top and the slope toe reached the maximum value at the end of construction; (iii) during operation, the settlement at the embankment top continued, and it changed rapidly at the start of operation. And then, the rate of the settlement slowed down and reached a steady state finally. The deformation of the slope foot was very small. This study can provide basis and reference for the design and construction of a similar project in mountain areas.

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Section: Test Setupmentioning

confidence: 99%

Investigation on the Settlement of High Rockfill Embankment Using Centrifuge Tests

et al. 2021

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“…The track model employed the ballastless track structure, which had the characteristics of strong stability, high smoothness and less maintenance, and is widely used in railway lines, especially in the high-speed rail. [16][17][18][19] According to the conditions on-site, the typical CRTSII type track structure was selected, including rail, fastener, track slab, CA mortar, base plate and foundation. 12 Because the track support layer of CRTSII type track structure was directly connected with the track slab, there was no vibration reduction effect, thus it can be ignored in the track model and regarded as a whole with the track slab.…”

Section: Finite Element Model Of Wheel-rail Transient Rolling Contactmentioning

confidence: 99%

Analysis of Rail Corrugation Characteristics on High-Speed Rail Based on Transient Finite Element Method

Wang¹,

Lei²

2021

The International Journal of Acoustics and Vibration

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By using the transient finite element method, a three-dimensional wheelset-track coupled rolling contact model for high-speed rail is established, and the rationality and effectiveness of the model are verified by field measurements. Next, the wheel-rail contact stress states and relative slip characteristics are calculated and analyzed to reveal the cause of inner rail corrugation. Then, the vertical vibration acceleration of the rail/wheel is taken as the output variable to study the dynamic responses of the wheelset-track system. Finally, the parameter sensitivity analysis is carried out. The results show that the maximum normal/tangential contact stress between the inner wheel and inner rail is greater than that between outer wheel and outer rail due to the unbalanced load of inner rail caused by the excess superelevation of track structure, which indicates that the unbalanced load of the inner rail may aggravate the development of rail wear, and the rationality of the model established in this paper is verified. The wheel-rail relative slip region on the inner rail side appears periodically, and the distance between the two adjacent slip regions is close to the characteristic wavelength of the measured inner rail corrugation, which illustrates that the periodic variation of slip regions on the inner rail surface plays an important role in the formation of rail corrugation, and the validity of the model is verified. The periodic distribution of wheel-rail relative slip regions on the outer rail surface is not obvious, demonstrating that the outer rail tends to form uniform wear, which is consistent with the fact that the outer rail corrugation is slight in the measured section. The wheelset-track system has been in the process of unstable continuous oscillation in the analysis interval, combined with the analysis results of the wheel-rail relative slip characteristics, it can be concluded that the unstable self-excited vibration of wheelset-track system under the condition of tangential contact force reaching saturation is the main cause of rail corrugation. The dominant characteristic frequencies of vertical vibration accelerations of rail and wheel are all 561 Hz, the corresponding characteristic wavelength (148 mm) is close to the distance (150 mm) between the calculated adjacent slip regions, and is also close to the characteristic wavelengths (125 mm and 160 mm) of inner rail corrugation, which shows that the resonance phenomenon occurs in the wheelset-track system at the above frequency, thus leading to the increase of dynamic responses of wheelset-track system. The fastener vertical stiffness and wheel-rail coefficient of friction have significant effect on the development of rail corrugation, and the running speed determines the occurrence probability of inner/outer rail corrugation by affecting the track superelevation state.

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“…Altogether, 12 types (cases) of slab tracks with various combinations of rail pads and resilient layers were considered (Table 4). They cover the possible conditions of track properties (Khajehdezfuly 2019, Lei and Wang, 2014, Lei and Zhang 2010, Sadeghi and Esmaeili, 2018. The vehicle characteristics were adopted from Chinese railway vehicle called CHR3 (Lei and Wang 2014, Lei and Zhang 2010, Sadeghi et al 2016b).…”

Section: Effects Of Track Parameters On the Trcmentioning

confidence: 99%

Development of train ride comfort prediction model for railway slab track system

Sadeghi

Rabiee

Khajehdezfuly

2020

Lat. Am. j. solids struct.

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Despite considerable importance of train ride comfort (TRC) in railway slab tracks, there is no TRC prediction model for the slab tracks in the available literature. In this regard, a practical TRC prediction model was developed in this research, taking into account all the track and rolling stock influencing parameters. For this purpose, a vehicle/slab-track interaction model was developed. The model was validated using the results obtained from a comprehensive field test. The effects of rail pad, resilient layer, subgrade, properties of rolling stock suspension systems and vehicle speed on the TRC were studied through a parametric study of the model in which random rail irregularities with various severities were considered. The results obtained were used to develop the TRC prediction model. The accuracy of the model predictions was evaluated by comparing them with those obtained from a railway field. It was shown that the TRC prediction model developed here is a reliable tool for estimation of the TRC from slab track properties, rolling stock parameters and track irregularities. Applicability of the model in the real world of practice is illustrated.

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

Cited by 18 publications

References 24 publications

Investigation on the Settlement of High Rockfill Embankment Using Centrifuge Tests

Investigation on the Settlement of High Rockfill Embankment Using Centrifuge Tests

Analysis of Rail Corrugation Characteristics on High-Speed Rail Based on Transient Finite Element Method

Development of train ride comfort prediction model for railway slab track system

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