沥青路面动态粘弹性响应分析

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振动与冲击 ›› 2009, Vol. 28 ›› Issue (9) : 159-162.

论文

沥青路面动态粘弹性响应分析

赵延庆钟阳

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Dynamic Viscoelastic Analysis of Asphalt Pavements

Zhao Yanqing Zhong Yang

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文章历史 +

摘要

沥青混合料是一种典型的粘弹性材料，在高速行车荷载作用下路面结构承受动态荷载，所以对沥青路面结构进行动态粘弹性分析，才能更客观的反映其行为特性。本文对典型的沥青路面结构建立了三维动态粘弹性有限元模型，分析了路表弯沉动态粘弹性响应及影响因素。结果表明弯沉峰值的大小及出现时间受计算点离轮载距离的影响。阻尼比对弯沉峰值的影响不大，但对弯沉振动衰减速率影响较大，阻尼越大，衰减的越快。温度对弯沉峰值及振动衰减速率均有较大的影响，温度越高，振动衰减的越快。比较了不同条件下动态分析和准静态分析得到的弯沉峰值，表明动态分析得到的结果平均要大12％左右，且弯沉峰值增加百分比受横向距离的影响。

Abstract

Asphalt mixtures are typical viscoelastic materials and pavements are subjected to dynamic loads under high-speed traffic. Thus, behavior of asphalt pavements can be more realistically described by conducting dynamic viscoelastic analysis. In this study, a three-dimensional dynamic viscoelastic model was developed for a typical asphalt pavement, and dynamic viscoelastic response of surface deflection and its influencing factors were evaluated. The results show that the deflection peak value and time of its occurrence were affected by the distance between the point of interest and applied load. Damping ratio has negligible influence on deflection peak value, while it has significant influence on the decaying rate of deflection vibration. The vibration decays more rapidly with an increasing damping ratio. Temperature has great effects on both the deflection peak value and decaying rate. Decaying rate increases with increasing temperature. Comparisons were made between the peak values of deflection obtained through dynamic and Quasi-static analyses. The results indicate that the peak values obtained from dynamic analysis were about 12% larger than those obtained from Quasi-static analysis, and the percentage of increase in the peak value varies with horizontal distance.