Initial Study On Vibration Control Of Bridge

The problem of the vibration of bridge under vehicles was put forward from practice. The bridge not only should bear the static, but also the effect of moving loads and the vibration inertia power of bridge and vehicles when the vehicles pass the bridge. Higher the speed of the vehicles is, more important the safety problem is. The safety of high speed vehicles and the riding comfort of passengers should be guaranteed. So it is important to study the vibration controlling technology of bridge.According to vibration theory, the dynamic differential equation of the vehicle-bridge coupling system was deduced. The bridge vibration control was analyzed using MATLAB soft with two parameter optimization formulas of MTMD. It includes several parts as followed:1. The dynamic model of bridge under moving vehicles was established through the analysis on vehicle-bridge coupling effect. The dynamic differential equation of the simple supported beam under moving vehicles was deduced by the mode of beam.2. The natural frequency and mode function of continues beam was deduced by three-bending -moment method and analytic method, and the results of two methods was contrasted.3. Three analogue method of track irregularity was introduced. It was simulated by triangle series method in this paper and the result was contrasted with the analytic method.4. The vibration of simple-supported beam under moving vehicles was controlled by two MTMD parameters optimization methods and the controlling effect was compared and discussed.5. The dynamic character of the continuous beam under moving vehicles was analyzed, and the vertical vibration controlling of the continuous beam was studied with the Den Hartog parameter method.6. The vehicle balance of fore-and-aft control was compared and studied.