Dynamic Response Analysis of Asphalt Pavement Due to Combined NonUniform Moving Load

Abstract:

To study the influence of temperature distribution on the dynamic response of asphalt pavement, a 3D finite element model in transient mode of asphalt pavement, subjected to nonuniform moving load, was established based on the measured temperature distribution in the field and the dynamic modulus results of the actual pavement material in lab. The dynamic response time history and spatial distribution of pavement structure within the actual temperature field was analyzed and compared with that of the isothermal structure model. The result shows that the temperature simulated by the bottom temperature control method could be used to analyze the actual dynamic response during both the lowtemperature and hightemperature period in summer. The isothermal pavement structure overestimates the vertical strain and the shear strain of upper layer and lower layer, but underestimates the shear strain of the middle layer during the hightemperature period in summer. During the lowtemperature period in summer, the actual dynamic response of asphalt pavement was larger than the value calculated from the isothermal model. The isothermal model underestimates the effect of temperature distribution on the rutting and cracking potential of asphalt pavement.

Key words:road engineering; isothermal model; numerical simulation; dynamic response; temperature field; nonuniform moving load