李小珍, 耿杰, 王党雄, 张迅, 梁林. 中低速磁浮列车-低置梁系统竖向耦合振动研究[J]. 工程力学, 2017, 34(12): 210-218,247. DOI: 10.6052/j.issn.1000-4750.2016.11.0868
引用本文: 李小珍, 耿杰, 王党雄, 张迅, 梁林. 中低速磁浮列车-低置梁系统竖向耦合振动研究[J]. 工程力学, 2017, 34(12): 210-218,247. DOI: 10.6052/j.issn.1000-4750.2016.11.0868
LI Xiao-zhen, GENG Jie, WANG Dang-xiong, ZHANG Xun, LIANG Lin. STUDY ON VERTICAL COUPLING VIBRATION OF LOW-MEDIUM SPEED MAGLEV TRAIN AND AT-GROUND-STRUCTURE SYSTEM[J]. Engineering Mechanics, 2017, 34(12): 210-218,247. DOI: 10.6052/j.issn.1000-4750.2016.11.0868
Citation: LI Xiao-zhen, GENG Jie, WANG Dang-xiong, ZHANG Xun, LIANG Lin. STUDY ON VERTICAL COUPLING VIBRATION OF LOW-MEDIUM SPEED MAGLEV TRAIN AND AT-GROUND-STRUCTURE SYSTEM[J]. Engineering Mechanics, 2017, 34(12): 210-218,247. DOI: 10.6052/j.issn.1000-4750.2016.11.0868

中低速磁浮列车-低置梁系统竖向耦合振动研究

STUDY ON VERTICAL COUPLING VIBRATION OF LOW-MEDIUM SPEED MAGLEV TRAIN AND AT-GROUND-STRUCTURE SYSTEM

  • 摘要: 为了探讨中低速磁浮列车-低置梁系统竖向耦合振动,基于SIMPACK和ANSYS联合仿真,首先建立了中低速磁浮列车-桥梁/低置梁系统竖向耦合振动模型,以某试验线20 m简支梁现场动载试验为依据,验证此方法的可靠性。随后,根据所建立的中低速磁浮列车-低置梁系统竖向耦合振动模型进行动力仿真分析,并探讨了不同参数对低置梁竖向动力响应的影响。结果表明:低置梁自振频率较高,一阶竖弯达32.9 Hz;低置梁框架跨中竖向动位移及加速度均较底板中心大,框架振动属于高频振动(相对于底板振动),在50 Hz~100 Hz加速度显著大于底板中心;磁浮列车荷载加载频率较高,该加载频率(整数倍)易与低置梁自振频率重合或接近而产生共振效应,显著放大低置梁动力响应;随着支撑脱空长度的增大,低置梁动力响应显著增大,且增速加大,随着路基刚度和底板厚度的增大,低置梁动力响应减小,且减小的幅度变小。

     

    Abstract: In order to study the vertical coupling vibration of a low-medium speed maglev train and at-ground-structure system, a vertical coupling vibration model of the maglev train-bridge (at ground structure) system was established firstly based on the SIMPACK and ANSYS joint simulation. The joint simulation method was verified by the field experiment for a 20m simply-supported girder in a test line. Then, the vertical coupling vibration model of the maglev train and at-ground-structure system was analyzed. The influence of the parameters for the at-ground structure was discussed. The study results indicated that:the vibration frequency of the at-ground structure is relatively high; the first order vertical bending frequency is 32.9Hz; the vertical displacement and acceleration of the frame center are both bigger than that of the bottom center; the vibration of the frame is the high frequency, comparing with the bottom vibration; the acceleration is significantly greater than that of the bottom in the range of 50 Hz~100 Hz; the load frequency of the maglev train is relatively high and the loading frequency (integer multiple) is easily coincidence with or close to the natural frequency of the at-ground structure, which leads to the resonance effect and the dynamic responses of the at-ground structure are significantly enlarged; with the increase of the void length of subgrade supporting, the dynamic responses of the at-ground structure are obviously enlargement and the growth rate is increased; with the increase of uniform spring stiffness and the bottom thickness, the dynamic responses are reduced and the decrease rates are smaller.

     

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