Dynamic Response of Long-Span Arch Bridge and Riding Comfort under Wind Load

Wind and vehicle loads are the primary factors influencing the dynamic response of long-span bridges and ride comfort. The bridge surface roughness under different grades was simulated using the trigonometric series approach, the wind load was generated by the fast spectral analysis method, and a dual-axle, four-wheel, 13-degree-of-freedom car model was established. The Jiujiang Yangtze River Bridge is selected as the engineering background, with the mode approach used to establish the vehicle-bridge coupled vibration balance differential equation and the Newmark-β integral iteration adopted to solve it. The overall weighted root-mean-square acceleration of the car body was calculated according to the ISO2631-1997 standard to evaluate riding comfort. The dynamic responses and riding comfort of the vehicles were studied as they passed through the Jiujiang Yangtze River Bridge at different wind velocities, driving speeds, and bridge roughness grades. In addition, the dynamic responses of the bridge were studied at different wind velocities. The results showed that the vehicle's dynamic response increases with increasing wind velocity and vehicle speed, degradation of the bridge surface condition, and deterioration of riding comfort. An increase in wind velocity reduced the vertical displacement of the bridge, whereas the vertical acceleration and lateral vibration responses increased significantly.