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| 1 | 板边离缝对桥上CRTSⅢ型板式无砟轨道动力特性的影响显示文摘CRTSⅢ型板式无砟轨道结构中的自密实混凝土层损伤会致使轨道板部分脱空,进而影响列车行驶的舒适性、安全性以及轨道板和桥梁结构的耐久性。为研究板边离缝对桥上CRTSⅢ型板式无砟轨道系统动力响应的影响,基于多体动力学理论,利用ANSYS+SIMPACK联合仿真,建立了考虑墩台纵向支座刚度、轨道结构及层间接触特性的列车-轨道-桥梁一体化动力仿真模型,分析了不同离缝宽度、长度以及离缝位置工况下系统的动力特性,并归纳了板边离缝的长度和宽度的限值。研究表明:在自密实混凝土没有沿轨道板横向完全脱空时,板边离缝对列车-轨道-桥梁系统动力特性的影响不大。当自密实混凝土沿轨道板横向完全脱空时,在离缝长度超过1 m后,系统动力响应变化幅度增大。当离缝长度达到1.6 m时,轮重减载率达到0.769,超过限值,威胁列车行驶的安全性;当轨道板竖向加速度增幅达到250.1%的,将影响轨道系统的使用寿命。 | 闫斌 程瑞琦 潘文彬 谢浩然 付贺鑫 | 2022 | Journal of Central South University2022，29，8： | 3 |
| 2 | Seismic analysis of high-speed railway irregular bridge–track system considering V-shaped canyon effect显示文摘To explore the effect of canyon topography on the seismic response of railway irregular bridge-track system that crosses a V-shaped canyon, seismic ground motions of the horizontal site and V-shaped canyon site were simulated through theoretical analysis with 12 earthquake records selected from the Pacific Earthquake Engineering Research Center(PEER) Strong Ground Motion Database matching the site condition of the bridge.Nonlinear seismic response analyses of an existing 11-span irregular simply supported railway bridge-track system were performed under the simulated spatially varying ground motions. The effects of the V-shaped canyon topography on the peak ground acceleration at bridge foundations and seismic responses of the bridge-track system were analyzed. Comparisons between the results of horizontal and V-shaped canyon sites show that the top relative displacement between adjacent piers at the junction of the incident side and the back side of the V-shaped site is almost two times that of the horizontal site, which also determines the seismic response of the fastener. The maximum displacement of the fastener occurs in the V-shaped canyon site and is 1.4 times larger than that in the horizontal site. Neglecting the effect of V-shaped canyon leads to the inappropriate assessment of the maximum seismic response of the irregular high-speed railway bridge-track system. Moreover, engineers should focus on the girder end to the left or right of the two fasteners within the distance of track seismic damage. | Zhihui Zhu Yongjiu Tang Zhenning Ba Kun Wang Wei Gong | 2022 | Railway Engineering Science2022，30，1： | 2 |
| 3 | Geometry deviation effects of railway catenaries on pantograph– catenary interaction: a case study in Norwegian Railway System显示文摘This paper presents a non-contact measurement of the realistic catenary geometry deviation in the Norwegian railway network through a laser rangefinder.The random geometry deviation is included in the catenary model to investigate its effect on the pantograph–catenary interaction.The dispersion of the longitudinal deviation is assumed to follow a Gaussian distribution.A power spectrum density represents the vertical deviation in the contact wire.Based on the Monte Carlo method,several geometry deviation samples are generated and included in the catenary model.A lumped mass pantograph with flexible collectors is employed to reproduce the high-frequency behaviours.The stochastic analysis results indicate that the catenary geometry deviation causes a significant dispersion of the pantograph–catenary interaction response.The contact force standard deviations measured by the inspection vehicle are within the scope of the simulation results.A critical cut-off frequency that covers 1/16 of the dropper interval is suggested to fully describe the effect of the catenary geometry deviation on the contact force.The statistical minimum contact force is recommended to be modified according to the tolerant contact loss rate at high frequency.An unpleasant interaction performance of the pantograph–catenary can be expected at the catenary top speed when the random catenary geometry deviation is included. | Yang Song Tengjiao Jiang Petter Navik Anders Rønnquist | 2021 | Railway Engineering Science2021，29，4： | 2 |
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