摘要
随着圆曲线钢箱梁桥在城市交通中的应用愈发广泛,为探究其在中低速磁浮车辆运行作用下的振动响应特性,基于多体动力学和有限元方法建立车辆-轨道-钢箱梁刚柔耦合动力学模型,采用动态电磁阻尼力影响的二维磁轨关系,并考虑轨道关键部件的参振作用,分析圆曲线段钢箱梁的振动特性,探讨钢箱梁板厚、车辆速度及车体质量对钢箱梁振动响应的影响。结果表明:受曲率影响,钢箱梁在发生弯曲的同时亦会伴生扭转,产生弯扭耦合振动;钢箱梁的振动主要由10~20 Hz的钢箱梁整体弯曲振动、30~40 Hz的钢箱梁扭转振动以及50~70 Hz的轨道局部振动引起;计算得到的钢箱梁跨中横向及垂向最大挠度分别为1.26 mm、3.88 mm,均满足相关标准要求,钢箱梁具有足够的支撑刚度;各工况下的垂向加速度均未超过5.0 m/s^(2)的限值,且最高达到2.2 m/s^(2);在板厚10 mm以及超员载荷工况下,横向加速度大多超过1.4 m/s^(2)的限值,且最高达到4.0 m/s^(2);车辆速度的减小和车体质量的增加均会放大弯扭耦合作用影响,而板厚的增加则能够有效降低弯扭耦合作用影响,当板厚由10 mm增至40 mm时,一阶横弯及扭转频率对应振幅分别减小94.3%、98.7%。
With the application of circular curved steel box girder bridge in urban traffic becoming more extensive,in order to investigate its vibration response characteristics under the operation of the medium-low-speed maglev vehicle,a rigid-flexible coupled dynamic model of vehicle-track-steel box girder(SBG)is established based on multi-body dynamics and finite element method.Both the two-dimensional magnetic/rail relationship with the dynamic electromagnetic damping force and the interaction among key components of the track are considered in the model.The vibration characteristics of the SBG in the circular curve segment are analyzed,and the effects of slab thickness,vehicle speed and car-body mass on vibration responses of the SBG are discussed.Results show that under the influence of curvature,the SBG is bent with torsion,resulting in bending-torsional coupled vibration.The vibration of the SBG is mainly caused by the overall bending vibration of the SBG at 10~20 Hz,the torsional vibration of the SBG at 30~40 Hz,and the local vibration of the track at 50~70 Hz.The calculated maximum lateral and vertical deflections of the SBG midspan are 1.26 mm and 3.88 mm,respectively,which meet the requirements of the relevant standards.The SBG has sufficient support stiffness.The vertical acceleration under all operating conditions doesnt exceed the limit of 5.0 m/s^(2) and reaches the maximum of 2.2 m/s^(2).Under the condition of 10 mm slab thickness and overload,the lateral acceleration mostly exceeds the limit of 1.4 m/s^(2) and reaches the maximum of 4.0 m/s^(2).Under the influence of torsional vibration,the lateral acceleration decreases with the increase of velocity,contrary to the vertical acceleration.Both the reduction of vehicle speed and the increase of car-body mass will magnify the influence of bending-torsional coupling,while the increase of slab thickness can effectively reduce the influence of bending-torsional coupling.When the slab thickness increases from 10 mm to 40 mm,the corresponding amplitudes of the fi
作者
尚贤洪
刘宇
李苗
雷成
马卫华
罗世辉
SHANG Xianhong;LIU Yu;LI Miao;LEI Cheng;MA Weihua;LUO Shihui(State Key Laboratory of Traction Power,Southwest Jiaotong University,Chengdu 610031,China;Product Research&Design Center,CRRC Tangshan Co.,Ltd.,Tangshan 063035,China;Henan Engineering Research Center of Rail Transit Intelligent Security,Zhengzhou Railway Vocational&Technical College,Zhengzhou 451460,China)
出处
《铁道标准设计》
北大核心
2024年第4期109-115,122,共8页
Railway Standard Design
基金
国家自然科学基金项目(51875483,52102442)。
关键词
中低速磁浮
圆曲线钢箱梁桥
刚柔耦合
动力学
振动响应
弯扭耦合作用
medium-low-speed maglev
circular curved steel box girder bridge
rigid-flexible coupling
dynamics
vibration response
bending-torsional coupling
