Probabilistic analysis of buckling of continuous welded rail considering stochasticity in track

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K04661
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 22020:Structure engineering and earthquake engineering-related
• Research Institution: Niigata University
• Principal Investigator: Abe Kazuhisa 新潟大学, 自然科学系, 教授 (40175899)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 軌道座屈管理 / 座屈確率 / 初期通り変位 / 道床横抵抗力 / ランダム波形

Outline of Final Research Achievements

Probabilistic analysis of continuous welded rail track buckling is achieved. For this purpose, the Monte Carlo simulation (MCS) is performed, in which the initial lateral misalignment and track lateral resistance are generated as stationary random process. It was found that the buckling probability is sensitive to statistical parameters such as the standard deviations of the misalignment and the lateral resistance. Influence of the track lateral realignment on the buckling strength is also discussed. Through MCS, it was found that the realignment based on the 10m-chord versine criterion can be an effective remedy for the reduction of track buckling probability. Moreover, possibility of buckling prediction based on measurement data which is obtained for the lateral alignment is discussed. It was found that the buckling analysis with alignment estimated from 5m-chord versine data enables the buckling prediction with good accuracy.

Free Research Field

応用力学

Academic Significance and Societal Importance of the Research Achievements

継目の無いロングレール軌道では適切な座屈管理が重要となる．軌道座屈強度はレールの横方向初期たわみ(通り変位)と横方向拘束力(道床横抵抗力)とに大きく依存するが，それらはバラツキを有しているため，座屈強度の確定論的評価ができない．現行では，座屈が確実に発生し得ないレベルのレール温度に基づいた管理がなされているが，過度な安全性が求められている懸念がある．
本研究では，上述の不確実性を考慮して軌道座屈強度を確率論的に評価した．また，軌道状態に関する情報量の多寡に応じた管理手法についても検討した．これらの成果をとおし，より合理的な座屈管理手法の可能性を示唆することができた．