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采用连续变化的局部接触应力来描述轮胎-路面接触面内的瞬态动荷载,研究了瞬态动荷载对柔性路面的影响。把瞬态动荷载模型成功地应用于三维有限元分析,计算了柔性路面在双轮组一次作用下的动态响应。计算结果表明,柔性路面在不同路面温度下的响应依据力学分析模型是准静态或动态的改变,动态模型中考虑到了质量惯性力和阻尼的作用。并且,采用动态分析的路面响应时间历程与实际的相似程度比较高,如果忽略质量惯性力和阻尼的作用,HMA层底拉应变和路基顶面的压应力计算值会变小。
The continuously changing local contact stress is used to describe the transient dynamic load in the tire-road contact surface and the influence of transient dynamic load on the flexible road surface is studied. The transient dynamic load model was successfully applied to the three-dimensional finite element analysis, and the dynamic response of the flexible pavement under the single action of double-wheel set was calculated. The calculation results show that the response of flexible pavement to different pavement temperatures is quasi-static or dynamic according to the mechanical analysis model, and the mass inertia and damping are taken into account in the dynamic model. Moreover, the pavement response time history with dynamic analysis is quite similar to the actual one. If the mass inertia and damping are neglected, the tensile stress at the bottom of HMA and the compressive stress at the top of subgrade will be smaller.