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交通荷载下沥青路面动力响应研究是建立路面动态设计体系的基础,是目前道路界研究的热点问题之一。将车辆荷载视为移动荷载,沥青路面结构视为层状体系结构,路面材料视为粘弹性材料,基于连续体系统动力学和线性理论,建立了沥青路面动力学模型。模型中将车轮荷载处理为间距足够大的周期荷载,采用Fourier变换技术,在求解移动简谐荷载作用下沥青路面动力响应基础上,得到任意复杂分布形式的车轮荷载作用下的沥青路面动力响应。以一种典型的半刚性基层沥青路面为例,分析了其动力响应规律,与加速加载试验结果进行对比,在沥青面层底部动态应变时间历程曲线、动力响应横向分布规律和最大动应变数值等3个方面,理论分析结果与试验结果吻合良好,验证了模型的可靠性。
The research on the dynamic response of asphalt pavement under traffic load is the basis of establishing the dynamic design system of pavement, which is one of the hot issues in the current research of road circle. Considering the vehicle load as a moving load, the asphalt pavement structure is regarded as a layered structure and the pavement material is considered as a viscoelastic material. Based on the continuum system dynamics and linear theory, a dynamic model of asphalt pavement is established. In the model, the wheel loads are treated as periodic loads with enough spacing. The dynamic response of asphalt pavement under any wheel load is obtained by using the Fourier transform technique to solve the dynamic response of asphalt pavement under the action of moving harmonic load. Taking a typical semi-rigid asphalt pavement as an example, the dynamic response of the asphalt pavement is analyzed and compared with the results of accelerated loading test. The dynamic strain time history curve, the horizontal distribution of dynamic response and the maximum dynamic strain value In three aspects, the theoretical analysis is in good agreement with the experimental results, which verifies the reliability of the model.