Study on the Seismic Influence Coefficient of Track Irregularity
on the Train Dynamic Effect of High-Speed Railway Bridge
基于轨道不平顺对高铁桥上列车动力效应的地震影响系数研究
Track irregularity is an important factor affecting the train-track-bridge system interaction, and for the seismic design of the track-bridge system, the study of the law of the influence of track irregularity on the train dynamic effect is of great theoretical significance. Based on this, the finite element models of China railway track structure (CRTS) II plate high-speed railway simple-supported girder bridge and CRH2C high-speed train model are developed and compared with the shaking table test results to verify their validity. Considering track irregularity and earthquake randomness, a sample library of the train dynamic effect of the track-bridge system under earthquake is established, the probabilistic statistical characteristics of the train dynamic effect are analyzed, and the influence level of track irregularity on the train dynamic effect of the track-bridge system under earthquake is studied, and the standard value of track irregularity influence coefficient of train dynamic effect based on probability guarantee rate is proposed. The results indicate that: the influence of track irregularity on the seismic response of bridge structure is slight, with their greatest impact not exceeding 1%. However, it has a significant impact on the seismic response of track structures. The standard values of the sliding and mortar layers' track irregularity influence coefficients are 1.49 and 1.71, respectively, at 0.1 g. Under various peak ground acceleration (PGA) settings, the fasteners' standard values for the track irregularity influence coefficient are less than 1.1. Additionally, the degree of influence of track irregularity on the seismic response of track structure decreases significantly as the PGA increases.
轨道不平顺严重影响列车-轨道-桥梁系统的相互作用。基于轨道桥梁系统的抗震设计，本论文研究了轨道不平顺对列车动力效应的影响规则，具有重大理论意义。在此基础上，本论文建立了带中国铁路轨道结构（CRTS）II型轨道系统的高速铁路简支梁桥有限元模型和CRH2C高速列车模型，并将其与振动模型对比。验证了其有效性。本论文基于轨道不平顺和地震不可测，建立了地震时轨-桥系统的列车动力效应样本库，分析了列车动力效应的概率统计特征，研究了地震下轨道不平顺对轨-桥系统的列车动力效应的影响程度，提出了概率保证率下轨道不平顺对列车动力效应影响系数的标准值。结果表明，轨道不平顺对桥梁结构地震反应的影响很小，最大不超过1%。但是，它对轨道结构的地震反应影响很大。轨道重0.1g时，滑动层和砂浆层轨道不平顺性影响系数的标准值分别为 1.49 和 1.71。基于多种峰值地动加速度 (PGA) ，紧固件对轨道不平顺影响系数的标准值小于 1.1。而且，随着 PGA 增加，轨道不平顺对轨道结构的地震反应的影响愈发降低。
Key words:Track irregularity; high-speed railway track-bridge system; train dynamic effect; seismic response; influence coefficient
关键词：轨道不平顺；高铁-轨道-桥梁系统；动车动力效应；地震反应；影响系数
来源：MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
发表时间：2023-05-03
检索：翟雅婷
翻译：蒲婷
一审：徐小焱
二审：彭莉
三审： 罗玲娟
上传发布： 姜浩
