首页|中低速磁浮诱发交通枢纽换乘中心振动响应研究

中低速磁浮诱发交通枢纽换乘中心振动响应研究

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  • 国家科技期刊平台
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针对中低速磁浮诱发机场综合交通枢纽换乘中心(GTC)振动问题,建立磁浮列车-轨道梁耦合振动模型和轨道梁-GTC-土体有限元模型,采用两步法对车致GTC振动响应特征、传播规律和振级进行分析.磁浮列车采用多体动力学建模,轨道梁采用有限元法建模,两者之间通过线性化磁轨关系形成耦合振动模型,并通过与现场实测结果对比验证了模型的正确性.基于所建立的耦合振动模型,获取H型钢轨枕与承轨台之间的扣件力时程并将其施加在轨道梁-GTC-土体模型上,通过瞬态分析得到了GTC典型观测点的动力响应.结果表明:磁浮列车诱发振动沿高度方向传播时,结构柱和楼板的振动响应均随高度的增加先减小后增大,沿水平方向传播时,振动响应随距离的增大而快速衰减;GTC振动响应存在明显的倍频现象,即扣件力主频倍频处振动响应的功率谱密度曲线存在明显峰值;当车速为60 km/h时,车辆激励主频与轨道梁一阶竖向自振频率接近,此时观测点的1/3倍频程最大振级大于其他车速;当磁浮列车以60～120 km/h车速通过GTC时,各楼层最大Z振级均未超过规范限值,表明该机场GTC具有良好的整体刚度.
Study on Vibration Response of Transfer Center of Transportation Hub Induced by Low-to-medium Speed Maglev Trains
To address the vibration problem of the airport ground transportation center(GTC)induced by low-to-medium speed maglev train,a coupled vibration model of maglev train-guideway girder and a finite element model of guideway girder-GTC-soil are established,and then the two-step method is used to analyze the response characteristics,propagation laws,and vibration levels of the vibration problem.The maglev train is modeled using multi-body dynamics,and the guideway girder is modeled using finite element method.The coupled vibration model is formed by linear magnet-rail relationship between the two components,and the correctness of the model is verified by field measurement results.Based on the established coupled vibration model,the time history curves of the fastener force between the H-shaped rail sleeper and the rail support platform are obtained.The fastener force is applied to the guideway girder-GTC-soil model,and the dynamic response of typical observation points of GTC is obtained by transient analysis.The results show that when the vibration induced by maglev train propagates along the height direction,the vibration responses of structural columns and floors decrease first and then increase with the increase of height.When the vibration propagates along the horizontal direction,the vibration response decreases rapidly with the increase of distance.There is an obvious frequency doubling phenomenon in the vibration response of GTC,that is,there is an obvious peak value in the power spectral density curve of the vibration response at the frequency doubling of the main frequency of the fastener force.When the vehicle speed is 60 km/h,the main frequency of the vehicle excitation is close to the first-order vertical natural frequency of the guideway girder.At this time,the maximum vibration level of the 1/3 octave of the observation point is greater than other vehicle speeds.When the maglev train passes through the GTC at 60～120 km/h,the maximum Z vibration level of each floor does not exceed the standard limit,indicating that the airport GTC has good overall stiffness.

low-to-medium speed maglev trainairportground transportation center(GTC)propagation lawvibration level assessmenttwo-step method

王力东、孙天洋、卜秀孟、韩艳、李凯

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长沙理工大学 土木工程学院,湖南 长沙 410114

桥梁工程安全控制教育部重点实验室(长沙理工大学),湖南 长沙 410114

中国建筑第五工程局有限公司,湖南 长沙 410004

中低速磁浮 机场 换乘中心 传播规律 振级评估 两步法

国家自然科学基金国家自然科学基金中国博士后科学基金湖南省自然科学基金湖南省研究生科研创新项目

52208459521784522022M7230042022JJ40496CX20220895

2024

10.16339/j.cnki.hdxbzkb.2024057

湖南大学学报(自然科学版)
湖南大学

湖南大学学报(自然科学版)

CSTPCD北大核心
影响因子：0.651
ISSN：1674-2974
年,卷(期)：2024.51(5)
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