Research On Environmental Vibration Characteristics In Bridge Section Of Cheng-Guan Rapid Railway

Environmental vibration induced by the rail traffic has attracted considerable attention, which has become one of the seven environmental hazards. Many specialists home and abroad had done lots of researches and obtained abundant research result. However, the existing research results can not solve the problem of vibration generated by present rail system. The thesis mainly based on the environment vibration theory and combined in-situ test to measure the environment vibration induced by the Cheng-guan rapid railway. It can be helpful to understand the environmental vibration characteristics.First of all, In-situ tests have been conducted on the bridge of the main line and preliminary revealed the environmental vibration characteristic of Cheng-guan rapid railway. Secondly, using the equation proposed in the thesis, the formula presented by [2010] No.44and the recommended by Japan’s Kyoto institute of pollution prediction to forecast the environmental vibration of Cheng-guan rapid railway. Finally, the equation feasibility was certified by comparing and the best prediction equation was selected for the Cheng-guan rapid railway. The main results of the thesis are as follows:1. Form the variation of the various test data: the vibration level and the vibration acceleration are all decreased with the increase of the distance from the central line. The attenuation rapid near the vibration source is greater than that outside source.2. The high frequency near the vibration dominates the vibration relative to the far from outside through the analysis of the1/3octave of each measurement point curve. The main frequency range, optimal frequency and vibration amplitude are all decreased with the increase of the distance from the central line. The main vibration frequency is mainly between10-63Hz.3. The result shows that the increase of train rapid will lead to the increase of vibration strength according to the Time-history and Fourier curve in and outside of the third point of Quanfu countryside.4. It is suggested that the environmental vibration basically decreases with exponential through regression analysis. Result showed that the proposed equation quite adapted to the Cheng-guan rapid railway, followed by the [2010] No.44and the equitation recommended by Japan’s Kyoto institute of pollution. Therefore, the proposed equitation quite suit for the prediction to the Cheng-guan rapid railway compared to other two methods.