Measurement Analysis and Structural Vibration Reduction Optimization of"Bridge and Construction Integration"Type Elevated Stations
To study the vibration comfort level problem of"bridge and construction integration"type elevated stations,a typical elevated station of this type is taken as the research object.The field measurement analysis of its floor vibration caused by train operation is conducted,and a refined finite element model of the elevated station is established based on the theory of vehicle-bridge coupling analysis.The optimization analysis of structural vibration reduction of the elevated station is carried out from the aspects of vibration source,transmission path and affected body.The results show that the elevated station of this type is seriously affected by vehicle operation induced vibration,and the vibration sensitive area of the station hall floor is the center of the mid-span floor.The vibration response of the floor can be reduced by increasing the elastic modulus of the rail beam,reasonably increasing the storey height,placing secondary beams in the center of the floor slab in the station hall floor area and laying floating floor slab.But the effect of a single measure for structural vibration reduction is poor.While the optimal combination of the above-mentioned four measures has good vibration reduction effect.The maximum Z vibration level of the floor center after the vibration reduction optimization is 73.15 dB and the vibration reduction amount is 13.54 dB,which meets the requirements of vibration comfort.
vibration and wave"bridge and construction integration"type elevated stationvehicle-induced vibrationvibration comfortvibration control
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