Influence of Combination Types on Vibration Response of Superstructure of Subway Station
In order to study the effect of subway vibration on the dynamic response of different types of subway stations and their superstructures,three kinds of combination types,namely"soft combination","hard combination Ⅰ",and"hard combination Ⅱ"were proposed based on the differences in the main bearing of the connection between the subway station and the superstructure.The train load spectrum was obtained by means of the vehicle-rail coupling model,and a numerical simulation model of the subway station-superstructure was established using finite difference software FLAC3D and compared with measured data to verify the correctness of the model and the parameters.Finally,the vibration response of the superstructure under the three kinds of combination types was studied based on numerical simulation from the time domain and frequency domain.The results show that the acceleration peak from the station hall to the first floor of the superstructure decreases by 69.10％under the soft combination and 2.08％under the hard combination Ⅰ,but it increases by 2.94％under the hard combination Ⅱ.The vibration acceleration of the superstructure in the hard combinations is larger than that in the soft combination.The vibration frequency of the superstructure under the three kinds of combination types is mainly 40-90 Hz.In addition,for the same floor of the superstructures,the vibration decreases with the increase in the distance from the vibration source.The maximum acceleration level of the first floor of the superstructure under the soft combination is 68.2 dB,which has decreased by 11.3 dB compared with that of the station hall layers.The maximum acceleration level of the superstructure under the hard combination Ⅰand hard combination Ⅱ is 83.4 dB and 79.4 dB.The first principal stress attached to the superstructure is very small due to subway vibration,and it attenuates quickly in the upward propagation process.From the station hall to the superstructure,the attenuation of the first principal stress of the soft combination is 85.81％,and that of the hard combination Ⅰ and hard combination Ⅱ is 63.46％and 72.27％,respectively.Furthermore,the spacer soil attenuates the additional stress obviously.It is suggested to choose the soft combination in the actual construction project of subways.
万方数据
维普
