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《Engineering Mechanics》 2017-12
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STUDY ON VERTICAL COUPLING VIBRATION OF LOW-MEDIUM SPEED MAGLEV TRAIN AND AT-GROUND-STRUCTURE SYSTEM

LI Xiao-zhen;GENG Jie;WANG Dang-xiong;ZHANG Xun;LIANG Lin;Department of Bridge Engineering, School of Civil Engineering, Southwest Jiaotong University;  
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 20 m 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 32.9 Hz; 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.
【Fund】: 国家自然科学基金项目(51378429);; 四川省科技计划项目(2016HH0076);; 四川省教育厅科研项目(16ZA0009)
【CateGory Index】: U266.4
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