Vibration test of superstructures in metro station throat area
In order to study the vibration impact of subway operation on the upper buildings,taking the super-structure of the throat area of a subway station in Fuzhou City as the test object,the method of field test was adopted for an analysis of the vibration response characteristics at the central points of the superstructure buil-ding slabs and the footings of shear walls in the throat area of subway stations,and the comfort degree was evaluated based on the annoyance model.Results show that with the increase of the number of floors,vibration gradually attenuated in the middle of the floor in the lead plumb direction,while the fourth floor experienced vibration amplification,particularly the effective values of the vibration acceleration of the floor slab and shear wall foot;the dominant frequency of the floor plate's lead plumb direction amplitude peak was 40～70 Hz,while the shear wall foot's lead plumb direction amplitude peak was mainly around 10 Hz.The amplitudes showed an initial tendency of attenuation and then amplification with the increase of floors.The horizontal plumb track amplitude showed a positive correlation with the number of floors,with peak amplitude peaks con-centrated mainly in the ranges of 0～20 Hz and 40～60 Hz;the vibration acceleration level VAL of the floor slabs increased with the increase of frequency in the range of 1～50 Hz but gradually decreased with the in-crease of frequency in the range of 50～80 Hz.The first floor VAL exceeded the first level of the limit,and the lead vertical Z vibration level VLZ of each plumb track decreased overall as the number of floors increased;the occupants of the property above the throat area of the subway station may experience"mild annoyance"in the first-floor bedroom during subway operation.The research findings can serve as a reference for the vibration damping design of subway station superstructures.
metro stationsuperstructurethroat areavibration testvibration levelannoyance degree
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