Study On Vibration Response In Buildings Over Metro Depot Due To Road Traffic

With the rapid development of urban metro construction in China,the construction of metro depot has developed rapidly in recent years because of its high land utilization rate and high rate of return on investment.However,the rail lines in the depot area are concentrated,and there are many curves and turnout sections,so the vibration and noise of the over-track buildings can be caused when the subway trains enter and leave the depot frequently.In addition,road vehicles can also be designed in some metro depot project.For the structural design of the road under over-track building of the metro depot,the vibration response of the over-track building structure can be more complicated and changeable due to the dual effect of subway train operation and road traffic.Based on this,this paper takes the over-track building of the metro depot which passed by road as the road research object and establishs a large dynamic finite element numerical.The vibration acceleration of the column structure of the metro depot caused by road traffic and metro traffic was used as the input excitation of the finite element model to study the effect of road traffic and metro traffic on the vibration response of the over-track building structure.The main research work and basic conclusions are stated as follows:1.This paper selected Beijing north road and north central axis landscape avenue intersections as the test site,and tested the vibration acceleration response of the bridge deck and the bridge pier structure caused by road traffic.Then " pier-rail-deck " threedimensional finite element model was established to verify the reliability and rationality of the model with the measured road traffic load as the load input.2.Taking beijiao metro depot of Foshan metro as the research object,the dynamic finite element model of the over-track building of the metro depot through by road and subway was established,and the vibration response of the over-track building structure under the measured road traffic load,metro train load and both two loads were calculated respectively.The results show that the vibration response caused by traffic flow at 50km/h is generally less than that caused by metro train running at 5km/h,but the vibration response caused by large vehicles on the road is close to that caused by metro.In addition,the control frequency of the vibration of the roof structure caused by road traffic load is concentrated at 10-30 Hz,while the main frequency of the vibration caused by metro operation is mainly at 40-60 Hz.The two types of vibration can be well distinguished through the vibration spectrum.3.The road traffic loads measured on site were classified according to vehicle type and speed,and the vibration response of the over-track building structure under different types of road traffic loads was calculated.The results show that the vibration response of the roof structure increases with the increase of traffic speed and axle load.4.By changing the section form of the column connecting the cover plate of Beijiao metro depot,the influence of the different section size and shape of the column on the vibration transmission of road traffic load is studied.It is found that the vibration response of the roof structure decreases with the increase of the connecting column section,but the change of column section shape has little effect on the vibration response.5.The vibration response of different floors of the over-track building structure is studied under different road traffic loads and different connecting column structure forms.The results show that regardless of the load type and column structure,the vibration response of the over-track building increases first and then decreases with the increase of the floor.