Researches On The Bridge's Dynamic Response Under Active Vehicle Load

As the rapid development of national economy, communications and transport undertakings, highway transport amount is constantly increasing, burden of highway bridge is more and more heavy, especially that, as an important facility of communications and transport, after a period of using, the deck surface would be demaged in the certain extent, which will lead to the driving vibration, and this viberation will impect the bridge structure, if severely, will cause damage to the bridge structure, therefore, the dynamic response of highway bridge became more and more restricting the safty and activity of the bridges. Therefore, researches on the bridge's dynamic response under active vehicle load are widely concerned by the engineers. Based on the theory findings by the predecessor, further research on the dynamic response of highway bridge caused by deck smoothness are carried out in this paper. The author's work and originality innovation points are as following:(1)Concerning to the unsmooth of deck, more reasonable random unsmooth theory are indrifted. According to the Power Spectrum Density which described the pavement smoothness, analog simulation on the 5 different pavement degrees by the mathematic model in computer is carried out.(2) By the using of ANSYS, combined with bridge-vehicle vibration incremental equation, simulated the motion process of the load on the beam, influence to the bridge impect factor and nodal force by the vehicle speed and pavement smoothness are analyzed.(3) To describe the vehicle-bridge couple effect more veritably, using ANSYS/LS-DYNA to simulate it, established solid model of the vehicle and bridge separately, considering the touch and impect between the both in the motion to simulate the interaction between vehicle and bridge, elementary results are indicated. Element meshment and influence between material difference to the vibration response of bridge are discussed. Indicated that equivalence the influence of pavement smoothness to prismoid can simplify the problem.