求解高速列车引起连续梁桥墩顶反力的半解析方法.docVIP

 A semi-analytical method to solve reaction on pier top induced by high-speed train over continuous girder bridge# Cao Yanmei* 5 10 15 20 25 30 35 40 (School of Civil Engineering, Beijing Jiaotong University, Beijing 100044) Abstract: In order to calculate the force transmitted to the top of pier induced by high-speed train running through continuous girder bridge, the semi-analytical dynamic interaction model is established for train-track-continuous girder bridge system, in which the dynamic character-istics of train, track, and bridge are taken into account. In the method, all the derivations are carried in the frequency domain and the vibrations in the time domain are obtained by inverse Fourier transformation, which makes it very convenient to observe dynamic characteristics of train-track-bridge structure from the point of frequency. Compared to the FEM model, the presented semi-analytical method is easier to calculate and the solution is more accurate. Keywords: High-speed train; continuous girder bridge; semi-analytical method; reaction on pier top 0 Introduction Over the last decades, as a rapid transportation, the high-speed railway has developed rapidly in China and abroad. Since the elevated bridge has the advantages of less land use, small pier and abutment settlement, and convenient transfer with other forms of transports, high-speed railway lines built on elevated bridges are being widely used. For example, in Japan, for the Shinkansen, the structure of various bridges takes up nearly half of the total railway length; in China, for the 1038 km Beijing-Shanghai High-speed Railway, the length of bridges is 1016 km, occupying 80.5 per cent of the total railway line. However, the environmental vibrations induced by the elevated railway system may cause human annoyance, damage to ancient and historical buildings, and interruption of sensitive instruments. Therefore, it is necessary to develop the prediction and assessment methodology for ground vibra