Analysis Of Vibration On The Roof Of The Double-decker Underground Vehicle Section Of The Subway

As an important part of urban public transportation,the subway can not only ease ground traffic congestion,but also effectively alleviate air pollution.With the rapid construction and use of the subway,the trains in the subway depot frequently run.The environmental vibration caused by the vehicle operation seriously affects people’s normal life and reduces the quality of people’s work environment.Safety,the use of equipment in the depot and the use and maintenance of related precision instruments present significant challenges.Therefore,this paper takes a double-deck underground vehicle section of a subway as the research object,and summarizes the vibration response of the vehicle section and the test characteristics based on the test data of each floor area.Relevant standard norms evaluate whether the vibration status of the depot exceeds the standard,and use the finite element software to establish the roof property model of the depot and predict its vibration.The main conclusions are as follows:1.The vibration propagation law of each section of each floor of the double-deck underground vehicle section of the subway is very complicated and does not have universal regularity.The main vibration frequency of the vibration caused by the operation of the train on the negative and negative layers is relatively low,and the vibration levels of the sections on the negative layer are larger than other floors.Low-frequency vibration will affect the use of precision instruments,and attention should be paid to the vibration isolation and vibration-proof measures in the relevant area of the negative layer.2.The overall vibration of the double-deck underground depot of the subway has its special law.As far as the horizontal direction is concerned,the train runs from the throat area to the straight line segment,and the vibration shows a trend of increasing first and then attenuating;In terms of vertical direction,when the train runs through the measuring point on the negative and negative layers,the vibration is transmitted from the source through the building structure to the ground layer,and not all of the superimposed amplification occurs,even with a certain attenuation.This has different characteristics from the propagation law ofvibration caused by general subway operation in buildings.3.According to the current status evaluation table of the sensitive point vibration of the double-deck underground vehicle section of the subway,it can be found that the overall vibration control of the subway depot except for the individual measuring points exceeds the standard.The vibration of the ground layer and the negative layer of the throat section 1exceeds the standard requirements,so the ground layer cannot be directly used as the building construction layer of the vehicle section,and the vibration reduction measures should be considered.4.The finite element software is used to establish the roof model of the vehicle section and predict the vibration condition.It is concluded that the vibration of the whole building has not exceeded the standard.However,it is recommended to improve the model after the design of the superstructure is completed to make the subway vehicle.And the vibration response of the property on the section of the section is more accurate.