The Vibration Acceleration Attenuation Variation and Spectrum Characteristics Analysis of High-speed Railway Bridge Section
The attenuation and spectrum characteristics of vibration acceleration at different monitoring points within a 60 m range centered on piers and abutments in high-speed railway bridge sections were studied through on-site monitoring.The ground vertical acceleration response caused by the train running load presented an overall attenuation trend with the distance increasing,however,there was a local amplification section at 20-30m and the Z vibration level at 25 m is equivalent to the vibration level at 5～10 m.The vertical 1/3 octave band vibration level of measuring point got to 90 dB at the vibration source of bridge pier.With the increase of distance,the high frequency vibration showed rapidly attenuation,while low frequency vibration attenuated slowly and spread further.The effective value of 1/3 octave band velocity at the vibration source could meet the precision instrument's effective value of 12.5 μm/s except for the vibration source point.The effective value of vibration acceleration at 5～40 m was relatively close in each frequency band,and the low-frequency vibration at 50～60 m was significantly weakened.Attention should be paid to the sustained impact of high-speed train running on precision instrument production sites aiming at the local amplification section of vibration acceleration.
万方数据
维普
