Abstract：Research purposes: Low and medium speed maglev railway is a novel transportation system, in which subgrade-track foundation beam structure has significant influences on system safety, operational stability and passenger comfort. In order to establish a simple and rational theoretical basis for practical engineering designs, a calculation method for track beam on subgrade foundation of the maglev railway is established based on the Timoshenko beam model on the Winkler elastic foundation. Research conclusions: (1) The formulas of deflections and internal forces on the beam under vertical vehicle loading are derived after a conversion of the dynamic vehicle load into equivalent inertia force using the pseudo-static approach with considering its boundary conditions, and it is mathematically carried out via the Laplace transformation method. A laboratory model test and on-site testing in a practical engineering are conducted to verify the proposed method. (2) The deflection and bending moment on the track foundation beam both present a parabolic distribution pattern along the beam length with the maximum value at the middle and the minimum at two ends. The maximum relative errors between the proposed and observed deflection and bending moment are about 10% and 5.6%, respectively. (3) The shear force on the beam exhibits a linear distribution along the beam length with zero at the mid-span, and the maximum error between the theoretical and experimental values is approximately 5%. (4) The proposed method can provide reference to specific design for track beam on subgrade foundation in low and medium speed maglev railway engineering.
贺钢, 邹泉锭, 肖世国, 齐远. 中低速磁悬浮铁路路基轨道梁计算方法*[J]. 铁道工程学报, 2024, 41(6): 52-56.
HE Gang, ZOU Quanding, XIAO Shiguo, QI Yuan. The Calculation Method for Track Beam on Subgrade Foundation in Low and Medium Speed Maglev Railway Engineering. Journal of Railway Engineering Society, 2024, 41(6): 52-56.
王理达. 中低速磁浮轨道梁关键技术研究[D]. 成都:西南交通大学, 2014.Wang Lida.Research on Key Technologies of Medium and Low Speed Maglev Track Beams[D].Chengdu: Southwest Jiaotong University, 2014.
[2]
高柏松,肖飞知.中低速磁浮交通低置线路结构动力特性分析[J].高速铁路技术,2022(4): 36-39.Gao Baisong, Xiao Feizhi.Dynamic Characteristics Analysis of Low Set Line Structure of Medium and Low Speed Maglev Transit[J]. High Speed Railway Technology, 2022(4): 36-39.
Liu J S.Phenomenon of Sharp Change and Concise Solutions for Timoshenko Beam Based on Modified Couple Stress Theory[J]. Acta Mechanica, 2022(7): 2595-2613.
[5]
倪萍,许超超,何军,等.超高速磁浮车-轨道梁竖向耦合振动分析[J]. 铁道科学与工程学报,2019(6):1361-1368.Ni Ping,Xu Chaochao,He Jun,etc. Vertical Coupling Vibration Analysis of Ultra High-speed Maglev Vehicle Guideway[J]. Journal of Railway Science and Engineering, 2019(6): 1361-1368.
[6]
El-Sayed T A, El-Mongy H H. A New Numeric-symbolic Procedure for Variational Iteration Method with Application to the Free Vibration of Generalized Multi-span Timoshenko Beam[J]. Journal of Vibration and Control, 2022(7-8): 799-811.
[7]
Sun Q K.A Numerically Stable Exact Method for Analysis of Partial-interaction Composite Beams Based on Timoshenko Beam Theory[J]. Engineering Structures, 2022(15): 456-467.
[8]
Mazilu T.Numerically Stable form of Green's Function for a Free-free Uniform Timoshenko Beam[J]. Mathematics, 2022(1):86.
[9]
Khasawneh F A, Segalman D.Exact and Numerically Stable Expressions for Euler-Bernoulli and Timoshenko Beam Modes[J]. Applied Acoustics, 2019, 151: 215-228.
[10]
GB/T5599—2019,机车车辆动力学性能评定及试验鉴定规范[S].GB/T5599—2019,Specification for Dynamic Performance Assessment and Testing Verification of Rolling Stock[S].
2024, Vol. 41 
版权所有 © 2014 《铁道工程学报》编辑部