Study On Vibration Response Of Metro Station Integrated Building Under Metro Train-induced

The metro station integrated building is a new structural type in recent years.It has the advantages of improving the utilization of land and space,driving the rapid development of surrounding areas,and making residents’ travel more convenient and efficient.Meanwhile,it has attracted extensive attentions because of the train-induced vibration and noise problems.In this thesis,based on a project of the metro station integrated building,the methods of numerical calculation and field testing were used to investigate the building vibration responses caused by metro trains entering and leaving the station.The vibration response of the overlying proposed building was predicted,and the difference in the vibration responses were compared when a train passing through the building at a constant speed and at an accelerating speed.The main research work and conclusions are as follows::(1)The measurement points were arranged on the platform floor,hall floor and floor B1 of the metro station integrated building,and the vibration responses of the station structure caused by trains entering and leaving the station were systematically analysed.The results indicate that when the steel-spring floating slab track(FST)is constructed in the station,the vibration responses of the platform floor and the hall floor are at lower levels.The vibration levels of the section on the top floor of the station increase with train speed.When two trains enter and exit the station at the same time,the superposition effect is not obvious.The vibration level significantly reduced with a maximum Z-vibration level of approximately 5 d B from the floor to the structural column.(2)In order to simulate the acceleration and deceleration effects when the train entering and leaving the station,an equivalent method of the train accelerating load was proposed considering reasonable simplification.Then,a group of equivalent train accelerating loads was calculated using the train-track coupling model.(3)Using the finite element(FE)software Midas GTS,a three dimensional(3D)dynamic FE model of the metro station integrated building was established.The equivalent train accelerating loads were applied on the model as an excitation,and the calculated and measured results were compared to analyse the validity of the model and the loads.Based on this comparison,the model of the overlying building of the metro station integrated building was established,and its vibration response was predicted.The calculation results indicate that when the steel-spring FST is constructed in the station,the vibration responses of the overlying proposed building are at lower levels,so there is no need to consider other vibration mitigation measures.(4)Based on the 3D dynamic FE model,the difference of the vibration responses of the structure were discussed under the train loads with constant speed and accelerating speed.The results indicate that there is little difference in the vibration response of the structure under train load with constant speed of 50 km/h and accelerating speed.