摘要
为探究双层六线铁路列车-桥梁系统耦合振动的空间效应,通过数值方法实现了车桥耦合振动的仿真计算,确定了空间影响规律及全桥最不利杆件位置,并应用于疲劳损伤评估.结合实际列车开行频率建立车桥系统仿真模型,获取桥梁变幅应力时程,并基于Miner线性损伤累积理论与S-N曲线进行疲劳损伤分析.结果表明:空间行车工况下车桥动力响应满足规范要求;相较于平面行车,空间行车时车辆动力响应增大,且动车组比货物列车增幅更明显,动车组安全性指标的空间-偏载系数达到3.808;空间行车对桥梁的横向位移影响严重,影响系数达到1.546;空间行车时桥梁各关键杆件的疲劳损伤指数出现不同程度的增幅,最高可达48.21%;桥梁服役期间主桁最不利杆件连接细节处疲劳损伤度为0.509.
To explore the spatial effects of coupling vibration of double-deck six-line railway train-bridge systems, the simulation calculation of a train-bridge system was carried out by numerical methods. The spatial influence law and the most unfavorable rod position of the whole bridge were determined and applied to fatigue damage assessment. The simulation model of the train-bridge system was established based on the actual train frequency, and the time history of the bridge variable amplitude stress was obtained. The fatigue damage analysis was conducted based on the Miner linear damage accumulation theory and the stress-number curve. The results show that the dynamic responses of the vehicle and the bridge under spatial driving conditions meet the specification requirements. Compared with plane driving conditions, the dynamic responses of the vehicle increase in space driving conditions, and the increment of the high-speed electric multiple units(EMU) is more obvious than that of the freight train. The space-eccentric load coefficient of the EMU safety index is 3.808. The influence of space traffic on the transverse displacement of the bridge is significant, and the influence coefficient is 1.546. The fatigue damage indexes of the key rods of the bridge increase in different degrees when driving in space, and the maximum value is 48.21%. During the service period of the bridge, the fatigue damage degree of the main truss’ s most unfavorable link connection details is 0.509.
作者
崔圣爱
张猛
曾光
申路
苏姣
祝兵
Cui Sheng'ai;Zhang Meng;Zeng Guang;Shen Lu;Su Jiao;Zhu Bing(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2023年第1期67-75,共9页
Journal of Southeast University：Natural Science Edition
基金
国家自然科学基金高铁联合基金资助项目(U1834207)。
关键词
多线铁路
车桥耦合振动
联合仿真
多体系统动力学
疲劳性能评估
multiline railway
vehicle-bridge coupled vibration
co-simulation
multi-body system dynamics
fatigue performance assessment
