Flexible Pavement Response Analysis under Dynamic Loads with Non-Uniform Tire Contact Stresses at Different Speeds and Surface Roughness

Pavement responses are affected by the magnitude and frequency of dynamic loads generated by vehicles, which are significantly dependent on axle configuration, pavement surface roughness, and vehicle speed. This paper analyzed dynamic loading effect on flexible pavement responses at different speeds. Full truck models were used to estimate vertical tire forces caused by pavement profiles with different roughness levels. An advanced three-dimension (3D) finite element (FE) model, which had been validated in the previous study, was utilized to simulate pavement responses under dynamic loads with non-uniform contact stresses. The dynamic load coefficient (DLC) of tire forces increased linearly with vehicle speed for class 5 vehicle considered in the analysis. This increasing trend was found more significant for the rougher pavement surface. The variation of dynamic loads causes the variation of pavement responses. The asphalt pavement responses at deeper depth (tensile strains at the bottom of asphalt layers and compressive strains on the top of subgrade) were more sensitive to dynamic load variation than those at near-surface (shear strains). The pavement responses were more sensitive to the variation of dynamic loads at high speeds as compared to low speeds. The study results provided the upper and lower limits of pavement responses due to dynamic loads for pavement design applications.

• Supplemental Notes:
  • This paper was sponsored by TRB committee AFD80 Standing Committee on Pavement Structural Modeling and Evaluation.
• Corporate Authors:

  Transportation Research Board

  ,    
• Authors:
  • Wang, Hao
  • Zhao, Jingnan
  • Zhang, Xianming
• Conference:
  • Transportation Research Board 98th Annual Meeting
  • Location: Washington DC, United States
  • Date: 2019-1-13 to 2019-1-17
• Date: 2019

Language

• English

Media Info

• Media Type: Digital/other
• Features: Figures;
• Pagination: 4p

Subject/Index Terms

• TRT Terms: Dynamic loads; Finite element method; Flexible pavements; Mathematical models; Operating speed; Rolling contact; Roughness; Stresses
• Subject Areas: Design; Highways; Pavements;

Filing Info

• Accession Number: 01698416
• Record Type: Publication
• Report/Paper Numbers: 19-04276
• Files: TRIS, TRB, ATRI
• Created Date: Mar 2 2019 3:41PM