A bending-shearing spring damper element is introduced to simulate the restraint effect of shear hinge on the end displacement of floating slab.The model of train and steel spring floating slab track under the condition of shear hinge connection is established accordingly.Modal expansion method and Newrnark-β method are adopted to calculate the dynamic responses of train-floating slab track system.The influence of shear hinge on the vibration reduction effect of train-track system is investigated.Through analyzing the train-track dynamic responses under different combinations of shear hinge parameters,the optimization for the combinations of shear hinge parameters is carried out.Results show that,the train-track dynamic responses at slab ends are obviously larger than other positions without the restraint of shear hinge.The rail displacement amplitude at slab ends is 57.6％ larger than other positions,which has a negative impact on the long-term operation of the train and passenger comfort.Setting the shear hinge at the ends of floating slab can reduce the discontinuity of the overall track stiffness at slab ends,thus the train-track dynamic response can be reduced.The bending stiffness of shear hinge can effectively improve the overall stiffness of floating slab track,while the shear stiffness can effectively reduce the displacement difference of slab ends.The optimal combination of the shear hinge parameters in the magnitude range of 105～ 1012 is obtained based on the statistical analysis of response amplitude,i.e.,the bending stiffness and shear stiffness is 5 000 MN · rad-1 and 5 000 MN · m-1 respectively.%采用弯剪弹簧阻尼单元模拟剪力铰对浮置板板端位移的约束作用,建立剪力铰连接条件下列车—钢弹簧浮置板轨道模型.采用模态分析法和Newmark-β法求解列车—浮置板轨道的动力响应,研究剪力铰对列车和轨道减振效果的影响,并通过不同剪力铰参数组合下的车轨动力响应分析,进行剪力铰参数组合的优化.结果表明:无剪力铰情况下,车轨动力响应在板端处均较其他位置处明显偏大,其中,板端处钢轨位移幅值较非板端处增大了57.6％,对列车长期运营及乘客舒适度造成不利影响;将剪力铰设置于浮置板板端位置,可减小板端轨道整体刚度的不连续,从而减小车轨动力响应;剪力铰的抗弯刚度可有效提高浮置板轨道的整体刚度,剪力铰的抗剪刚度则可有效降低板端位移差;通过对响应幅值的统计分析,得到在105～1012量级范围内剪力铰的抗弯刚度和抗剪刚度的最优组合为抗弯刚度5 000 MN·rad-1、抗剪刚度5 000 MN·m-1.
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