Change regularity by FEM for dynamic response of structural layers of asphalt pavement with dynamic load

This paper aims at the damage of structural layers of asphalt pavement which is caused by dynamic load, uses half sinusoidal incentive load model to consider the vibration effect of dynamic load in the response of pavement structure; through simulating the driving conditions of vehicles at different speed, analyzes the change regularity of dynamic tensile stress at the bottom of each structural layer and vertical displacement of pavement surface with dynamic load by three dimensional finite element analysis. Then comparatively studies the response with static load. The results show that peak value of vertical displacement of pavement surface and dynamic tensile stress at the bottom of the each pavement structural layer increase with the decrease of vehicle speed. When the vehicle speed is less than 34 Km/h, peak value of dynamic tensile stress at the bottom of basement layer will exceed the static tensile stress, which is more likely to result in damages to the structure of asphalt pavement. The paper also provides reference for completing design specification of asphalt pavement.