卡车动载实测与分析

Measurement and Analysis of Dynamic Loading of Trucks

通过在卡车各轴上安装了变形传感器,标定后得到变形传感器和轮胎接地压力之间的转化关系,进行了卡车动载实测,分析了路面平整度、车速及载重对卡车动载的影响.结果表明,当路面行驶质量指数为优、中、差时,平均动载系数分别为5%、15%和20%左右,最大动载系数可达25%;最大动载相对于静载平均增加20%、55%和80%左右,最大动载变化率可达90%以上.动载系数、最大动载及其变化率均随车速的增加而增加,当行驶质量指数较差时,增加幅度更为明显.研究成果为在路面结构分析和设计中考虑动载影响提供了基础数据.

Deformation sensors were installed on truck axles and calibrated to get the relationships between the sensor readings and tire contact pressure.The truck dynamic loading was measured,and the effects of pavement evenness,vehicle speed and truck weight on the dynamic loading were analyzed.The results show that the average dynamic load coefficients（DLC）are 5%,15%和20%for good,median,and poor ride quality index（RQI）,respectively,and the maximum DLC is more than 90%.The maximum dynamic loads（MDL）are 20%,55%and 80% more than the static load,and the changing rate of MDL can be more than 90%.DLC,MDL and its changing rate increase with speed,especially when the RQI is poor.The results presented provide the basic data for considering the dynamic load in pavement analysis and design.