重载铁路桥上货物列车脱轨预防措施  

Derailment precautions of freight train on bridge in heavy haul railway

作　　者：龚凯[1] 向俊[1] 毛建红[1,2] 余翠英[1] GONG Kai;XIANG Jun;MAO Jianhong;YU Cuiying(School of Civil Engineering, Central South University, Changsha 410075, China;School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang 330013, China)

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]华东交通大学土木建筑学院,江西南昌330013

出　　处：《中南大学学报（自然科学版）》2017年第12期3406-3414,共9页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金委员会与神华集团有限公司联合资助项目(U1261113);高等学校博士学科点专项科研基金资助项目(20100162110022);牵引动力国家重点实验室开放课题资助项目(TPL0901,TPL1214);江西省青年科学基金资助项目(20142BAB216003)

摘　　要：针对重载铁路常见桥梁结构特点,建立货物列车-轨道-桥梁系统(简称"FTTB系统")空间振动计算模型;按照列车脱轨能量随机分析理论,提出重载铁路FTTB系统横向振动稳定性分析方法。通过算例,计算圆形墩加固前、后FTTB系统横向振动稳定性及其振动响应。研究结果表明:算例中圆形墩加固后FTTB系统抗脱轨能力可提高50%;圆形墩加固前、后FTTB系统横向振动失稳临界车速分别为134.45 km/h和156.99 km/h,容许极限车速分别为107.56 km/h和125.59 km/h;圆形墩加固后货物列车以80 km/h车速过桥时平稳性有保证;与加固前相比,桥梁跨中和墩顶横向位移分别减小54.5%和83.8%。该分析方法能够同时反映货物列车脱轨信息和FTTB系统空间振动特性,可为桥上货物列车脱轨预防措施提供更加全面、科学的评价。Considering the general structure characteristics of bridges in heavy haul railway,the freight train?track?bridge(FTTB)system spatial vibration calculation model was established.Meanwhile,based on the random energy analysis theory of train derailment,the analysis method of lateral vibration stability of FTTB system was proposed.Through a calculation example,the lateral vibration stability and the corresponding vibration response of FTTB system before and after the reinforcement of the circular pier were calculated.The results show that the anti-derailment capacity of FTTB system increases by50%after the circular pier reinforcement in the calculation example.Before and after the circular pier reinforcement,the lateral vibration critical speed of FTTB system is134.45km/h and156.99km/h,and the admissible limit speed is107.56km/h and125.59km/h,respectively.After the reinforcement,the operation stability of freight train is guaranteed when the freight train passes over the bridge with speed of80km/h.Moreover,the lateral displacements of the bridge mid-span and the top of the pier are reduced by54.5%and83.8%,respectively,compared with those before the reinforcement.In conclusion,this method reflects not only the freight train derailment information but also the spatial vibration characteristic of FTTB system.It can provide more comprehensive and scientific evaluation for the derailment precautions of the freight train.

关 键 词：铁道工程 重载铁路 货物列车 横向振动 

分 类 号：U213.2[交通运输工程—道路与铁道工程]