Analysis of the Impact of Traffic Density on Coupled Vibration of Overloaded Random Traffic Flow and Bridge
The study establishes a model of heavy random traffic flow based on cellular automata and introduces a vehicle-bridge coupled vibration system to explore the law of bridge vibration response induced by the density of heavy random traffic flow.By simulating one-way two-lane heavy random traffic flow under periodic boundary conditions using cellular automaton and NaSch model,the study aims to accurately reproduce the evolution of traffic flow on the bridge,and establish a coupled vibration model of heavy random traffic flow and bridge which vehicle type,speed,lane,weight,and driver behavior characteristics are taken into consideration.MATLAB software is used for programming to solve the coupled vibration characteristics of heavy random traffic flow and bridge.The results show that the overloaded traffic flow transitions from free flow to blocking flow,and the vertical deformation of the bridge gradually increases.The vibration acceleration initially increases and then decreases.The maximum vertical deformation of the bridge occurs during blocking flow,and the vertical vibration velocity and acceleration response of the bridge are most intense during dense flow.The energy peak of the bridge's vibration response is mainly concentrated around the bridge's main frequencies of 4 Hz and 9 Hz.With the increase in traffic density and the decrease in vehicle speed,the energy peak of the bridge's vibration response excited by random traffic flow first increases and then decreases.The maximum vibration response energy peak occurs during dense flow when the vehicle occupancy rate is 18%,and the congested flow with a vehicle occupancy rate of 31%is most likely to excite higher-order frequency vibrations in the bridge.
overloaded random traffic flowvehicle-bridge coupled vibrationcellular automatontraffic density
万方数据
维普
