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为准确模拟行驶车辆作用下刚性路面的动力响应,建立车辆—路面空间耦合振动精细化分析模型。车辆采用质点—弹簧—阻尼器空间整车模型,混凝土刚性路面采用弹性地基板有限元模型,采用改进的谐波叠加法考虑路面平整度的三维空间分布,利用车轮和路面的位移协调方程将车辆振动和路面振动联立求解。实例分析表明,所建立的车—路耦合振动模型能够真实地反映车辆和路面间的空间几何耦合关系和力学耦合关系;在三维路面不平度的激励下,车辆和路面的动态响应均表现出明显的空间分布特性;与瞬态动力分析方法相比,利用考虑路面不平度空间分布的车—路耦合振动模型对混凝土路面进行车辆动力响应分析时,路面弯沉和板底应力有明显增大。
In order to accurately simulate the dynamic response of a rigid pavement under the driving vehicle, a detailed analysis model of coupling vibration of the vehicle-pavement space is established. The vehicle uses mass-spring-damper space vehicle model. The concrete rigid pavement adopts the elastic foundation plate finite element model. The improved harmonic superposition method is adopted to consider the three-dimensional space distribution of pavement roughness. By using the wheel-pavement displacement coordination equation, Vibration and road surface vibration solve simultaneously. The case study shows that the established vehicle-road coupling vibration model can truly reflect the geometric coupling and the mechanical coupling between the vehicle and the road. Under the excitation of the three-dimensional road roughness, the dynamic responses of the vehicle and the road show obvious Compared with the transient dynamic analysis method, the road surface deflection and floor stress increase obviously when the dynamic response of concrete pavement is analyzed by the vehicle-road coupling vibration model considering the spatial distribution of road roughness.