Dynamic Response of Large Span Self-anchored Suspension Bridge Under Moving Vehicular Load

This paper studies the vehicle-bridge coupled vibration problems using the modal synthesis method. The independent vibration equation of the vehicle system and bridge system are established based on D'Alembert principle. Using the coupling condition, considering the impact of the deck roughness, the unified coupled vibration equation is given out and solved using the Newmark-β numerical method. A real bridge is analyzed using the method proposed in this paper. Several sensitive parameters such as deck roughness and vehicle speed are studied to get the influence law of the bridge dynamic response. The dynamic amplification factor of the different structural members is calculated based on the dynamic response. The results show that the current existing design code still has considerable improvements on provision of the impact factor and some recommendations for improvement are given out.