Based On The Analysis Of Transport Hub Vibration Response Characteristics And Comfort

With the rapid development of high-speed railway,the modern large-scale integrated transport hub combines various means of transport to realize the zero-transfer or short-range transport of various modes of transportation such as aviation,high-speed rail,general railway,rail transit,Due to its complex structure,the railway station structure contains viaducts,tunnels and other complex structural systems.As a result,the dynamic load of the train directly affects the interior of the structure,and its vibration response will reduce people’s comfort and may even affect the structure of the station building safety,How to effectively simulate the excitation of different vibration sources acting on the station building structure to study the environmental vibration characteristics of the integrated traffic hub has become an urgent problem to be solved in the structural design and vibration control of the station building,This issue has very important theoretical and practical significance for ensuring the normal use and safety of railway station structures.In this paper,the structural layer of Nanchang West Railway Station is measured and simulated,the vibration response induced by high-speed train,general-purpose train and subway train is analyzed and tested.The overall model of subway-subway tunnel-station building is established,and the influence of driving route,driving speed,two-lane driving and tunnel depth on the dynamic response of the structure is simulated,Based on the analysis of peak acceleration,spectrum analysis and 1/3 octave analysis,the vibration and propagation mechanism of the integrated transport hub station in the middle and low frequency range are studied.The local vibration characteristics and spectrum response characteristics of station structure are analyzed.Summarize the environmental vibration transmission characteristics of the integrated transport hub,and finally study the vibration comfort of the station structure.From the multi-criteria,evaluate the vibration response of the Nanchang West Railway Station.The new vibration given by German standard DIN4150 Limit,the research results of the new structure design and vibration prediction,vibration control has an important guiding role.(1)The structure of the station building is soft structure,the vibration response is at low frequency of 1-20 Hz,the natural frequency of floor structure is close to the main frequency of pedestrian load,and the comfort frequency should be selected reasonably(2)Different span of the floor has different vibration characteristics,the greater the span of the board,the softer the structure.Floor expansion joints can make the vibration response above 30 HZ decay rapidly.The vibration characteristics caused by different train types are the same,and the frequency distribution in different directions is basically the same.The main vibration frequency of station floor is concentrated in 0-300 Hz.The main vibration frequency of the floor of the waiting room mainly concentrates in 0-100 Hz.(3)Vibration response to the launch train and the mainline train are both transmitted through the centerline of the shaft.The vibration response of the key points of the floor is almost double that of single-track traffic in the two-lane driving condition.The key point of the floor is away from the center line of the track Increase 21 m,vertical acceleration vibration level average attenuation of 6 ~ 7dB;The vibrations of the vibration of the structural layer caused by subway trains at 20 Hz and 40 Hz are the slowest with the attenuation of distance.The attenuation of Z vibration level is 2 ~ 4dB for every 2m increase of buried depth for the same vehicle speed.The same depth,the speed for each additional 20 km / h,Z vibration level increased 2 ~ 5dB.(4)Compared with the existing comfort evaluation method,the new vibration limit given by the German standard is less strict than the traditional standard,and the new vibration limit is proposed to be 85 dB.