Effects of Random Non-uniform Load on Asphalt Pavement Dynamic Response
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International Journal of Pavement Research and Technology Journal homepage: www.springer.com/42947
Effects of Random Non-uniform Load on Asphalt Pavement Dynamic Response Zhoujing Yea, Yinghao Miaoa, Weidong Zhanga, Linbing Wanga,b* a
National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, China b Virginia Tech Lab on Multifunctional Materials, Virginia Tech, Blacksburg, VA 24061, United States Received 16 May 2020; received in revised form 23 July 2020; accepted 11 August 2020
Abstract
Dynamic response analysis of pavement helps with structure and material optimization. The vehicle loading has a significant effect on the pavement dynamic response, which is usually assumed to be concentrated load, uniform load, or harmonic load without considering the space-time characteristics. In this study, a validated quarter vehicle model and finite element road model were developed to obtain the random non-uniform load. The random non-uniform load integrates the randomness characteristics due to the vehicle-road interaction and spatial characteristics caused by the tire pattern. The impacts of the vehicle weight, speed, and road roughness on the vehicle dynamic load were analyzed. The effect of random non-uniform load on pavement dynamic response was investigated by comparing the pavement responses under constant non-uniform load and constant uniform load. Numerical analyses show that the stress extremum along the transverse and longitudinal sections can reflect the time-space characteristics of the loads. The damage of the surface layer is underestimated when the vehicle load is simplified to be a constant uniform load without considering the random and spatial characteristics. Keywords: Random non-uniform load; Quarter vehicle model; Asphalt pavement; Dynamic response; Finite element simulation
1. Introduction The dynamic response of pavement under moving vehicle loads reflects the information of traffic and structure, which is valuable to understanding pavement performance and enhancing pavement structure and material design. Because the form of vehicle load has a significant impact on the dynamic response of pavement, some researchers used numerical simulation methods to analyze the dynamic response of pavement under random load or load with spatial distribution characteristics. The dynamic response of pavement under random load is usually obtained by establishing a vehicle-pavement coupling model. Shi et al. [1] developed a vehicle-pavement coupling model to simulate the dynamic moving load. The tire-pavement contact area was assumed as a point contact. Sawant [2] proposed a solution algorithm to analyze the dynamic response of rigid pavement under a moving load. The interaction between moving load and pavement was considered as a spring-dashpot unit. Lak et al. [3]
* Corresponding author E-mail addresses: [email protected]; [email protected] (L. Wang). Peer review under responsibility of Chinese Society of Pavement Engineering.
studied the relationship between road
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