Layout Optimization of Rail Expansion Joint on Long‐Span Cable‐Stayed Bridge for High‐Speed Railway

Cai, Xiaopei; Liu, Wanli; Xie, Kaize; Zhu, Wenjun; Tan, Xiyuan; Gao, Yongjie

doi:10.1155/2020/8855140

Cited by 8 publications

(7 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A solid element was used to simulate the point rail with a material density of 7850 kg/m 3 , an elastic modulus of 2.1 × 10 11 Pa, and a Poisson’s ratio of 0.3. 20 Each characteristic section of the point rail was imported from the tip end of the point rail to the entire rail’s head section while fully considering the spatial variable section characteristics of the point rail, as shown in Table 1, and interpolation was performed to simulate the spatial transition between the heterogeneous characteristic sections, as shown in Figure 1.…”

Section: Analysis Of the Elastic Deformation Line Of The Point Rail I...mentioning

confidence: 99%

Study on the optimization of high-speed turnout crossing structures based on actual elastic deformation of point and splice rails

Wang

Zhao²,

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part F:

View full text Add to dashboard Cite

In this paper, to address the shortcomings of the crossing structure design based on the elastic bending center method and the lack of related research, an optimization method for high-speed turnout crossing structures was proposed based on the actual elastic deformations of point and splice rails. Based on the finite element theory, the actual loading characteristics and spatial variable section characteristics of point and splice rails were fully considered, and a refined simulation analysis model of the switching system of point and splice rails in crossing areas was established. Moreover, the elastic deformation lines of point and splice rails in the nonworking state were obtained for the first time, which were consistent with actual situations. On this basis, system optimization was performed for the connecting parts of the crossing with a movable point in a high-speed turnout. In the crossing structure simulation model, the length adjustment values of the first–sixth spacer blocks between the branch line–wing and point rails and between the mail line–wing splice rails were ≤1 mm. Moreover, the lengths of the seventh–ninth spacer blocks decreased by gradually increasing amounts, and the length of the ninth spacer block decreased the most (∼6 mm). The length of the second spacer block between the point and splice rails slightly increased, but the length of the third spacer block significantly decreased by 6 mm. The length adjustment value of the distance block between the point and splice rails was smallest (0.7 mm). The calculated optimal lengths of the connecting parts of the crossing were found to be close to the empirical values used in actual manufacturing processes, and the dimension optimization patterns were completely consistent with actual situation, which validates the proposed optimization method. Thus, the proposed method can effectively improve the coordination between rails and connecting parts in crossing areas, substantially reduce internal stresses in crossing systems, and improve their assembly performance and service life. Moreover, the proposed optimization parameters can provide valuable references for the research on next-generation high-speed turnouts (400 km/h) and for improving the designs of existing high-speed turnouts.

show abstract

Section: Analysis Of the Elastic Deformation Line Of The Point Rail I...mentioning

confidence: 99%

Study on the optimization of high-speed turnout crossing structures based on actual elastic deformation of point and splice rails

Wang

Zhao²,

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part F:

View full text Add to dashboard Cite

show abstract

“…In past studies, many scholars have studied bridge expansion joints [ 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 ]. Winkler et al [ 16 ] proposed a method to collect bridge expansion joint data.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Bridge Expansion Joint Damage Based on Natural Frequency

Feng

Yang

et al. 2023

Sensors

View full text Add to dashboard Cite

In this paper, three studies on modal bridge expansion joints were conducted through experiments. The advantages and disadvantages of acceleration and fiber optic strain sensors in the tested modal expansion joints were compared. Secondly, the variation in the natural frequency of the modal bridge expansion joints at different concrete curing periods was investigated. Finally, the effect of damage on natural frequency in different parts (the center beam, the support bar, and concrete in the anchorage zone) of the modal bridge expansion joint was analyzed. For this purpose, three specimens were cast, each with six damage states. Manual methods damaged the specimens. An impact hammer was used to excite the corresponding parts of the different components. The results showed that the acceleration sensor is optimal for the modal bridge expansion joint test. The specimen’s natural frequency increased with the curing time’s growth. The natural frequency increased by 10 Hz from day 3 to day 28 of curing. With the gradual increase in damage, the natural frequencies of the center beam and support bar showed a gradual decreasing trend. The damage to the concrete in the anchorage zone caused less significant changes in the natural frequency, but the overall natural frequency still had a decreasing trend. The sensitivity of each frequency to the damage was different in different parts.

show abstract

“…In the research on seamless track on cable-stayed bridges, Cai et al [18] established the finite element model of a long-span cable-stayed bridge, and the research shows that installing REJ on a long-span cable-stayed bridge can significantly reduce the longitudinal force of rail. Zhao et al [19] established a spatial finite element model for a 1092 m main span suspension bridge based on the bridge-track interaction theory and put forward a specific correction method to keep the rail in a zero-stress state when just laid.…”

Section: Introductionmentioning

confidence: 99%

Research on the Influence of Geotextile and Elastic Cushion on the Static Performance of Ballastless Track on Long-Span Cable-Stayed Bridges

Cai,

Chen,

Wang

et al. 2023

Applied Sciences

View full text Add to dashboard Cite

The elastic cushion is mostly used between the layers of ballastless tracks laid on a large-span cable-stayed bridge with a main span of more than 300 m. The rubber material is easy to harden and age, the geotextile has good acid-alkali resistance and antiwear performance, and the feasibility of geotextile application on the large-span cable-stayed bridge can be explored. The coupling model of a long-span cable-stayed bridge and the ballastless track was established to analyze the longitudinal mechanical characteristics of the seamless line, the deformation of the track structure, and the separation of the track plate and base plate under different loads. The results show that the application of geotextile or elastic cushion has little effect on the longitudinal mechanical properties of seamless lines. Compared to the elastic cushion, laying the geotextile increases the longitudinal stress of the slab by 0.13 Mpa, 0.025 Mpa, and 0.06 Mpa under different types of loads. The strength calculation of the seamless track is within the safety range. Laying elastic cushion can restrain the generation of separation under vertical loads, but there is no effect laying elastic cushion under temperature loads and braking loads, and the height of separation was less than 0.4 mm. The stress and deformation of the ballastless track do not exceed the standard when applying geotextile; it is feasible to apply geotextile on ballastless tracks on a large-span cable-stayed bridge. The next step is to study the vehicle–bridge–track dynamic response when elastic cushion and geotextile are laid.

show abstract

Layout Optimization of Rail Expansion Joint on Long‐Span Cable‐Stayed Bridge for High‐Speed Railway

Cited by 8 publications

References 25 publications

Study on the optimization of high-speed turnout crossing structures based on actual elastic deformation of point and splice rails

Study on the optimization of high-speed turnout crossing structures based on actual elastic deformation of point and splice rails

Experimental Study of Bridge Expansion Joint Damage Based on Natural Frequency

Research on the Influence of Geotextile and Elastic Cushion on the Static Performance of Ballastless Track on Long-Span Cable-Stayed Bridges

Contact Info

Product

Resources

About