Researches on Longitudinal Sound Field Radiated by Railway Box Bridge Arranged with CRTSIII Slab Track

Zhang, Xiaoyun; Shi, Guozhen; Zhang, Xiaoan; He, Zhenxing; Yin, Qiang

doi:10.1061/9780784481257.043

Cited by 1 publication

(2 citation statements)

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“…However, at present, it is difficult to determine the fixing-device stiffness in the CRTS II slab track because there are no reference testing results. Zhang, 7 Zhu, 9 Xu and Zhang, 10 and Su 11 set the fixing device stiffness as 10 2 MN/mm, 10 3 MN/ mm, 10 4 MN/mm, and 40 times the stiffness of the bridge cross section, respectively, in TBI analysis. The fixing device was often assumed to be a rigid connection between the bridge and base plate.…”

Section: Introductionmentioning

confidence: 99%

“…Previous studies have shown that the track-bridge interaction (TBI) force of the CRTS II ballastless track on bridge superstructures can increase significantly when the longitudinal stiffness of the fixing device deteriorates to a certain extent. 7 A recent study noted that the stiffness of the fixing device has a significant impact on rail deformation. 8 Hence, the fixing device is an important component in the CRTS II ballastless track, and its working performance has a significant impact on the mechanical performance of the track-bridge system.…”

Section: Introductionmentioning

confidence: 99%

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Stiffness identification of fixing device in CRTS II slab track based on long-term monitoring data

Wang

Lin

et al. 2023

Structural Health Monitoring

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The fixing device is an important component in the China Railway Track System (CRTS) II slab track, through which the longitudinal force of the track can be transferred to bridges and piers. The stiffness of the fixing device significantly affects the mechanical properties of the track. However, it is difficult to evaluate stiffness using conventional detection methods, because the fixing device is located under the base plate. In this study, the fixing-device stiffness of simply supported bridges was identified using long-term monitoring data and finite element (FE) analysis. First, a monitoring scheme was proposed based on the principle of track–bridge interaction. The strain in the base plate on both sides of the fixing device, as well as the temperature of the base plate and bridge, were obtained from 2015 to 2018. Then, the stiffness of the fixing device was proved to be closely related to the strain difference of the base plate on both sides of the fixing device, and the corresponding nonlinear mapping relationship was established through FE analysis. Finally, the fixing-device stiffness over 4 years was identified using long-term monitoring data and the established mapping function, and the influence of the stiffness degradation on the mechanical property of the track was discussed. This study can provide a reference for the design and maintenance of CRTS II slab tracks on multi-span simply supported bridges.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%