Study on the influence of vehicle-mounted excitation on long bridges

As the transportation network continues to prosper, Bridges, as the core pillar of transportation infrastructure, play an indispensable and vital role in the grand blueprint of the country's transportation development, so it is vital to ensure the structural health and safe operation of long Bridges. Through the analysis of the influence of vehicle-mounted excitation on the long bridge, the bridge model is established, the grid division is performed, and the bridge boundary conditions are set up. Then applied to the bridge to simulate the disturbance of the external environment to the bridge, and a deformation cloud image of the bridge is obtained. The deflection of the long bridge under different excitation is obtained by constructing the scale model of the long bridge, selecting the vehicle scale model and the three-position sensor by experimental research. The experimental results show that the bridge does exhibit an obvious vibration response under vehicle-mounted excitation, and this response changes at different vehicle positions and speeds, which is manifested by significant differences in vibration amplitude and frequency. In addition, the analysis further found that the vibration response of the bridge is closely related to key factors such as the weight and speed of the vehicle, which provides a strong scientific basis for the safe operation of the bridge.