The Influence Of Creep-Shrinkage And Temperature Effect On Coupled Vibration Of Vehicle-Bridge System For Long-Span Continuous Rigid Frame Bridge

With the accelerating development of Chinese high-speed railway, the long-span continuous rigid frame bridge is very widely used by its convenient construction, strong spanning ability and favorable smooth-going of the line. Along with the increasing of the speed of train, it raises a high standard for the smooth-going of the line, while, the deformation of the bridge caused by creep-shrinkage and temperature effect, may deteriorate the comfortable and running safety in high-speed railway. Therefore, it is important and meaningful to make some corresponding research.The thesis takes a88m+168m+88m continuous rigid frame bridge as an example. Based on vehicle-track-bridge coupling vibration theory, taking the effect of creep-shrinkage and temperature into account, the vehicle-track-bridge coupling vibration is analyzed in this article with BDAP V2.0(bridge dynamic analysis program). The main conclusions are as follows:(1) Considering the influence of creep-shrinkage or temperature effect, there is little change in the dynamic displacement and acceleration of bridge, the rate of wheel load reduction, vertical acceleration and Sperling value increase in different degrees. The result show that the safety index and the vehicle vertical dynamic response increased as the increment of deformation.(2) When the most disadvantageous condition of creep-shrinkage and temperature effects are taken into account, the maximum rate of wheel load reduction increase by14.3%while the maximum growth of the vertical acceleration of vehicle is10.7%. The result show that the creep-shrinkage and temperature effect may have adverse effects in the analysis of vehicle-track-bridge coupled system.(3) The deck deformation caused by creep and temperature changes belongs to vertical long-wave irregularity, affects greatly in vehicle vertical comfort when the train is traveling at a high speed while the lateral acceleration and lateral Sperling value change a little in this condition.The research results are significant to the theoretical research and practical applications for long-span continuous rigid frame bridge.