Analysis of vibration response characteristics of subway station and superstructure with hard combination

The vibration response and noise caused by subway trains can affect the safety and comfort of superstructures. To study the dynamic response characteristics of subway stations and superstructures under train loads with a hard combination, a numerical model is developed in this study. The indoor model test verified the accuracy of the numerical model. The influence laws of different hard combinations, train operating speeds and modes were studied and evaluated accordingly. The results show that the frequency corresponding to the peak vibration acceleration level of each floor of the superstructure property is concentrated at 10–20 Hz. The vibration response decreases in the high-frequency parts and increases in the lowfrequency parts with increasing distance from the source. Furthermore, the factors, such as train operating speed, operating mode, and hard combination type, will affect the vibration of the superstructure. The vibration response under the reversible operation of the train is greater than that of the unidirectional operation. The operating speed of the train is proportional to its vibration response. The vibration amplification area appears between the middle and the top of the superstructure at a higher train speed. Its vibration acceleration level will exceed the limit value of relevant regulations, and vibration-damping measures are required. Within the scope of application, this study provides some suggestions for constructing subway stations and superstructures.