Research on Dynamic Response of Simply-supported Beam Bridge under Different Traffic Flow States
In order to understand the influence of traffic flow state on the dynamic response of bridge,according to the road service level,the space headway and vehicle speed are selected as the evaluation indexes of traffic flow state and the two-axle plane vehicle model is selected to establish the multi-vehicle vehicle-bridge coupling vibration analysis model to analyze the dynamic response of simply-supported beam bridge under different traffic flow states based on the modal synthesis method.The results show that when the number of vehicles reaches 3,the maximum vertical displacement in the middle of the bridge span is the largest,when the number of vehicles increases to 5,the maximum vertical displacement in the middle of the bridge span tends to be stable;when the distance between vehicles increases,the superimposed dynamic effect between the vehicles is weakened,and the maximum vertical displacement in the middle of the bridge span gradually decreases and approaches the value under the single vehicle;in different traffic flow states,the steady flow has the least influence on the dynamic response of the bridge,and the restricted flow has the greatest influence on the dynamic response of the bridge.
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