Vehicle Bridge Resonance Judgment Method for Continuous Rigid Frame System

Numerical analysis method was presented in this paper to solve the response of the vehicle-bridge coupled vibration. In this method the bridge model and vehicle model were set up separately in the ANSYS environment. Then the relationship of the response of the coupled vibration was calculated by APDL language. Finally the vibration time response was obtained by imposing the coupled relationship on vehicles and bridges at any time. This method proved to be reasonable by comparing with existing literature and experimental results. This paper also presents the judging method and formulas of the response of the coupled vibration based on the conditions of single vehicle and multivehicles driving on the continuous rigid frame bridge and raised the judging models for resonance of different driving conditions. The results are in good agreement with the facts. The results showed that continuous rigid frame bridges are likely to cause response of resonance under the conditions of a single vehicle and equally spaced traffic flow. The load effect of the pier increases much more sharply than that of the main girder when the resonance occurs. Based on the results of this paper, it is suggest that disrupting the traffic flow by setting the deceleration traffic signs at the different longitudinal position on the bridge deck is an effecctive way to decrease the frequency of the resonance of the continuous rigid frame bridges.