车路耦合作用力特性及混凝土路面动态响应

应用1/4车-路耦合动力学模型及直接积分法,分析车辆以一定速度匀速移动时,车辆参数(集中质量、悬挂系统弹簧刚度和轮胎弹簧刚度)、路面板参数(路面板厚度、接缝宽度、接缝错台和接缝传荷等)以及地基参数(地基刚度、地基阻尼及地基弱化指数等)对车-路耦合作用力的影响;给出了动荷系数(动静荷载比)随各参量变化的影响曲线及其统计特征;探讨了有接缝混凝土路面板动弯沉和动应变的变化规律.结果表明,随着车速的提高,车-路耦合作用力的变异性增大,路面板动弯沉和动应变的波动性增强;因此,在水泥混凝土路面设计时,车-路耦合引起的动态效应应予以考虑.

Vehicle road Coupling Force Characteristics and Dynamic Responses of Concrete Pavements

When vehicles moving at a uniform speed on concrete pavements, the influences of different parameters, such as the vehicle parameters (concentrated mass, suspension stiffness and tyre stiffness), the pavement structure parameters (pavement thickness, joint width, joint faulting, joint load transfer capacity etc.) and the sub grade parameters (sub grade reaction modulus, sub grade damping and sub grade strength weakening index etc.), on the time varying force are systematically analyzed with the established quarter vehicle road coupling dynamics model and the direct integration method. The curves of loading impact factor (dynamic load upon static load) against a variety of parameters are provided, and the statistic characteristics of loading impact factor is also depicted. Then, the dynamic displacement and strain of concrete pavements are discussed accordingly. The results show that the variance of time varying force is getting larger with the increase of the vehicle moving speed, and the dynamic effects of displacements and strains on concrete pavements become more remarkable; therefore, while designing concrete pavements, the dynamic effects of concrete pavement arising from vehicle road interaction shall be considered.