Researches On The Inflences That Temperature Deformation And Creep Deformation Of Bridge Deck Have On The Train Running Performance Of Continuous Beam-framework Pier Bridge

In construction of the high speed railway bridges, because of the need of crossing existing lines, prestressed concrete continuous beam-framework pier bridge is widely adopted for its flexible capacity of crossing in recent years.The camber, and the deflection caused by temperature and the creep affect the track irregularity and the dynamic response of the vehicle-bridge system when the high-speed train passing through. Therefore, it is necessary to study it further. Based on WuJi canal super-major bridge(The bridge is continuous beam-framework pier bridge of7-16m) in Jin-Qin passenger transportation line,and taking the effect of temperature, creep and camber into account,the vehicle-bridge coupling vibration of continuous beam-framework pier bridge is analysed in this article. The main research contents are as follows:1.The design essentials and structural characteristics of the prestressed continuous beam-framework pier are summarized. China’s high-speed railway vehicle-bridge vibration research is briefly introduced. The necessity of study the vehicle bridge system coupling vibration analysis to this type of bridge and the effect of camber, creep and temperature effects is illustrated.2.According to the current railway standard on the continuous beam-framework pier bridge deck’s temperature deformation was calculated, the results show that in current railway standard the bridge deck temperature deformation has certain safety margin.3.Based on the principle of total potential energy with stationary val-ue in elastic system dynamics and the rule of "set in right position" for fo-ormulating system matrixes,the finite element modals of the continuous beam-framework pier bridge is established and the free vibration characteristic of this bridge is analyzed.4.Dynamic response of the vehicle-bridge system is analyzed and the results show that:The dynamic responses of the bridge are all within the allowed values when the influence of creep, temperature and camber effects are considered. And its variation to the different deck combination curve is not sensitive. But they have great impact on the running property of the vehicle.So great attentions should be paid to this problem at the stage of bridge design.