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High-Speed railway 2023年第2期1卷 97-109页

作者： Xiaopei Cai Wanli Liu Liang Gao Yonghua Su Jingfan Yang School of Civil Engineering Beijing Jiaotong UniversityBeijing 100044China railway Engineering Research Institute China Academy of Raiway SciencesBeijing 100081China

The complex bridge-track interaction between kilometer-span bridges and continuous welded rail(CWR)brings great challenges to CWR *** a suspension bridge with laying CWR as a case,the mechanical properties of CWR on the bridge are analyzed to reveal the sensitive areas of the track,and the design method of CWR and track structures on the beam ends are *** results show that the unidirectional rail Expansion Joints(REJ)need to be installed on the beam end of the kilometer-span bridge to reduce rail longitudinal *** to the bridge characteristics,there is no CWR fixed area on the kilometer-span bridge,and rail longitudinal force on the main span caused by bending loads needs to be *** deformation of track on the beam end is complex,which is the weak area on the kilometer bridge,the large relative displacement between the stock rail of REJ and the main beam can cause poor stability of ballast bed on beam end,small resistance fasteners need to be laid on the sides of stock rail on the main beam to increase the stability of ballast and fasteners on the beam *** improve the driving safety and comfort of beam end,the Sleeper-Supporting Apparatus(SSA)should be specially designed to ensure the uniform transition of track on beam *** and wind loads have a significant impact on track regularity on the kilometer span bridge,the dynamic response of trains and bridges under those loads needs to be attended to.

关键词： Kilometer-span suspension bridge continuous welded rail rail expansion joint Statics mechanical properties Sleeper-supporting apparatus Dynamic response

Static mechanics analysis of no bumping no vibration welding structure with double-inclined surface for high-speed & heavy-load CWR

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Science China(Technological Sciences) 2011年第3期54卷 603-609页

作者： SONG YuQuan WANG MingHui SONG JiaWang Superplasticity and Plasticity Research Institute Jilin University Changchun 130022 China

It is known from our former theoretical analysis that the single-inclined welding surface which is inclined towards the transverse direction of the rail can only eliminate vertical bumping, and the single-inclined welding surface which is inclined towards the vertical direction of the rail can only eliminate lateral vibration. In this paper, we put forward a welding structure of double-inclined welding surface to eliminate the vertical bumping and lateral vibration at the same time, and analyze the stress state of continuous welded rail (CWR) by combining geometrical azimuth. Furthermore, the increase of bearing capacity of CWR with the double-inclined welding surface is theoretically analyzed.

关键词： continuous welded rail double-inclined welding surface bearing capacity regularity

Sensitive factors research for track-bridge interaction of Long-span X-style steel-box arch bridge on high-speed railway

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Journal of Central South University 2013年第11期20卷 3314-3323页

作者：刘文硕戴公连何旭辉 School of Civil Engineering Central South University

X-style arch bridge on high-speed railways(HSR)is one kind of complicated long-span structure,and the track-bridge interaction is essential to ensure the safety and smoothness of *** an X-style steel-box arch bridge with a main span of450 m on HSR under construction for example,a new integrative mechanic model of rail-stringer-cross beam-suspenderpier-foundation coupling system was established,adopting the nonlinear spring element simulating the longitudinal resistance between track and *** transmission law of continuous welded rail(CWR)on the X-style arch bridge was researched,and comparative study was carried out to discuss the influence of several sensitive factors,such as the temperature load case,the longitudinal resistance model,the scheme of longitudinal restraint conditions,the introverted inclination of arch rib,the stiffness of pier and abutment and the location of the rail expansion *** results indicate that the longitudinal resistance has a significant impact upon the longitudinal forces of CWR on this kind of bridge,while the arch rib’s inclination has little ***,temperature variation of arch ribs and suspenders should be taken into account in the *** the restraint system without longitudinally-fixed bearing and setting the rail expansion devices on both ends are more reasonable.

关键词： high-speed railway track-bridge interaction X-style steel-box arch bridge continuous welded rail

Analytical solution to mapping rail deformation under bridge transverse deformation using energy variational principle

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Journal of Central South University 2022年第8期29卷 2654-2664页

作者： LAI Zhi-peng JIANG Li-zhong ZHOU Wang-bao LIU Xiang YU Jian ZHANG Yun-tai School of Civil Engineering Central South UniversityChangsha 410075China School of Civil Engineering Fujian University of TechnologyFuzhou 350118China

The track geometry is a critical factor that affects the running safety and riding comfort of trains moving on a high-speed railway *** study addresses the mapping relationship between the track deformation and lateral deformations of *** equations and natural boundary conditions of the track-bridge system are established based on the energy variational principle,and an analytical solution is derived for the track deformation accounting for lateral bridge deformations.A five-span simply-supported bridge with continuous welded rail has been selected as the case *** mapping rail deformations are compared to the finite element results,and both results agree well with each other,validating the analytical method proposed in this *** influence factors on the mapping rail deformation are further *** show that the mapping rail deformation is consistent with the girder displacement at the area that is away from the girder ends when the flexural stiffness ratio between the track and the bridge girder is *** interlayer stiffness has a significant effect on the mapping rail deformation when the track flexural stiffness is of a high value.

关键词： energy variational principle simply-supported beam bridge high-speed railway continuous welded rail mapping rail deformation

Influence of the Randomness of Longitudinal Resistance of Ballast Bed on Track-Bridge Interaction

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Engineering（科研） 2023年第11期15卷 729-741页

作者： Weiwu Dai Yunfei Zhang Bowen Liu Kaize Xie School of Safety Engineering and Emergency Management Shijiazhuang Tiedao University Shijiazhuang China School of Civil Engineering Shijiazhuang Tiedao University Shijiazhuang China

To get the influence of the randomness of longitudinal resistance of ballast bed (LRBB) on track-bridge interaction, the statistical law of LRBB was studied with existing test data and the Shapiro-Wilk test. Based on the principle of track-bridge interaction, a rail-sleeper-bridge-pier integrated simulation model that could consider the randomness of LRBB was established. Taking a continuous beam bridge for the heavy-haul railway as an example, the effect of the randomness of LRBB on the mechanical behavior of continuous welded rail (CWR) on bridges under typical conditions was carefully examined with a random sampling method and the simulation model. The results show that the LRBB corresponding sleeper displacement of 2 mm obeys a normal distribution. When the randomness of LRBB is considered, the amplitudes of rail expansion force, rail bending force, rail braking force and rail broken gap all follow normal distribution. As the standard deviations of the four indexes are small, which indicates the randomness of LRBB has little effect on track-bridge interaction. The distributions of the four indexes make it possible to design CWR on bridges with the limit state method.

关键词： continuous welded rail Track-Bridge Interaction Longitudinal Resistance of Ballast Bed Normal Distribution

Influence of Track Parameters on welded Turnout Group

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Journal of Southwest Jiaotong University(English Edition) 2007年第2期15卷 122-125页

作者：徐庆元王平屈晓晖李树德 School of Civil Engineering Southwest Jiaotong University No.3 railway Survey and Design Institute

By building the finite element model, the track parameters, including the ultimate longitudinal resistance, the length of the intermediate straight line, and the gap between spacer blocks, were analyzed for their influences on the longitudinal forces and displacements of the single turnout and turnout group, respectively. The results indicate that when the longitudinal resistance drops from 32 to 20 N/cm, the maximum additional longitudinal force of the turnout group increases by 19. 2%, and the maximum additional longitudinal displacement of the turnout group grows by 85.3% compared with 50.4% for the single turnout. When the length of intermediate straight line rises from 0 m to infinite, the maximum additional longitudinal force decreases by 38.8%, and the maximum additional longitudinal displacement by 80.3%.

关键词： railway engineering welded turnout group Finite element method continuous welded rail