Dynamic Viscoelastic Analysis of Asphalt Pavements

PDF(2005 KB)

Journal of Vibration and Shock ›› 2009, Vol. 28 ›› Issue (9) : 159-162.

论文

Dynamic Viscoelastic Analysis of Asphalt Pavements

Zhao Yanqing Zhong Yang

Author information +

History +

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.