不平整路面上的非稳定车流荷载研究及应用

车辆动荷载是引起路面损坏的最主要原因。目前国内外相关研究多集中于单一车辆对路面结构所产生的动荷载，实际上路面结构所承受的是车流荷载，而且车流在行驶过程中各车辆的车速和车辆之间的距离会产生变化，但关于这方面的研究甚少。针对这一工程实际问题，采用微观交通流模型中的跟车模型来模拟车流行驶过程中各车辆的速度以及它们之间车距的变化，车辆振动模型采用1/4车身结构的两自由度模型，并根据国家标准GB7031-861]规定生成路面轮廓的时域信号。最后分析了某水泥混凝土路面在生成的车流荷载作用下的动力响应，为研究车流荷载作用下路面结构动力响应提供了基础性成果。

Study and application of unstable traffic flow loads on rough pavement

The accidented pavements could bring displacement disturbance to the vehicles moving on them;and the irregular disturbance caused the vibration of the vehicle,which made the vehicles produce additional dynamic loads on pavement during vehicles running.The vehicle dynamic loads are the main reason that caused the pavement failure.The correlative studies concentrated on the dynamic load of single vehicle on pavement,while the unstable traffic flow loads worked on pavement actually.Aimed at the engineering problem,the car-following model was used to simulate the velocities and relative distances of every vehicle on pavement.PSD(Power Spectral Density) was used to describe the stochastic characteristic of pavement roughness.Then,the simulation model of the quarter vehicle vibration system was built using Simulink.The dynamic response analysis of cement concrete pavement under traffic flow loads was processed;and some conclusions were drawn,that could provide references for the structural design of pavement and vehicle,and the analysis of dynamic interaction between vehicles and pavements.