摘要
为解决既有铁路梁部抢修器材存在的强度刚度低、通车速度慢、拼架时间长、储存运输不便等问题,基于可展结构的特点,提出一种可展式铁路抢修梁的技术方案和架设方法:通过不同数量中间构架的纵向拼组并调整构架的展开状态,可使抢修梁适应32 m和24 m跨度的桥梁抢修;通过小型机具的辅助,可使抢修梁实现导梁架设以加快抢修进度;利用ANSYS软件建立32 m跨度抢修梁的有限元模型,并对抢修梁进行静力学分析和模态分析;利用UM软件建立C70敞车和CRH380A高铁动车的多体动力学模型,对抢修梁进行车桥耦合振动分析。结果表明:抢修梁跨中上弦杆、梁端右倾斜腹杆和梁端销轴对抢修梁的安全性起控制作用;抢修梁一阶自振频率为5.965 Hz,对应振型为横向弯曲,说明抢修梁的横向刚度较弱;货运列车通过抢修梁时,重车编组对桥梁响应不利,空车编组对车辆响应不利;影响桥梁安全性和车辆运行安全性的指标均随车速的提高而非线性增长。经分析,可展抢修梁的力学性能满足相关规范的要求,且货运列车和高铁列车能够分别以最高60 km/h和100 km/h的车速安全通过抢修梁。
In order to solve the problems of low strength and rigidity,slow traffic speed,long time for assembling,and inconvenient storage and transportation of existing railway emergency repair girder,based on the characteristics of deployable structure,a technical scheme and erection method for deployable railway emergency repair girder were proposed:Through the longitudinal assembly of different numbers of intermediate frames and adjusting the unfolded state of the frame,the emergency repair girder can be adapted to the emergency repair of bridges with a span of 32 m and 24 m;with the assistance of small machines,the guide girder erection can be achieved to speed up the repair progress.The finite element model of the 32 m-span emergency repair girder was established by ANSYS software,and the static analysis and modal analysis of the emergency repair girder were carried out;The multi-body dynamics models of C70 freight train and CRH380A high-speed train are established by UM software,and the vehicle-bridge coupling vibration analysis for the emergency repair girder was carried out.The results show that:The mid-span top chord,the right inclined web member at the girder end and the pin at the girder end control the safety of the emergency repair girder;The first-order natural vibration frequency of the emergency repair girder is 5.965 Hz,and the corresponding mode shape is lateral bending,indicating that the lateral stiffness of the emergency repair girder is weak;The heavy train formation is disadvantageous to the bridge response,and the empty train formation is disadvantageous to the vehicle response;The indexes that affect bridge safety and vehicle safety increase nonlinearly with the increase of train speed.Through analysis,the mechanical properties of the deployable emergency repair girder meet the requirements of relevant specifications,and freight trains and high-speed trains can safely pass through the emergency repair girder at a speed of up to 60 km/h and 100 km/h respectively.
作者
张非凡
徐光兴
李明阳
ZHANG Feifan;XU Guangxing;LI Mingyang(Hebei Engineering Research Center for Traffic Emergency and Guarantee,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;School of Safety Engineering and Emergency Management,Shijiazhuang Tiedao University,Shijiazhuang 050043,China)
出处
《铁道标准设计》
北大核心
2024年第1期117-125,共9页
Railway Standard Design
基金
国家重点研发计划项目(2016YFC0802207)
河北省教育厅在读研究生创新能力培养资助项目(CXZZSS2022111)。
关键词
铁路桥梁
铁路抢修梁
可展桥梁
架设方案
有限元模型
车桥耦合分析
railway bridge
railway emergency repair girder
deployable bridge
erection method
Finite Element Model
vehicle-bridge coupling analysis
