Influence of Tire Footprint Area and Pressure Distribution on Pavement Responses
For most pavement analyses, it is assumed that the tire load is uniformly applied over a circular area. Also, it is generally assumed that tire inflation and contact pressures are uniform throughout the contact area. Several studies on this topic have sho
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Abstract For most pavement analyses, it is assumed that the tire load is uniformly applied over a circular area. Also, it is generally assumed that tire inflation and contact pressures are uniform throughout the contact area. Several studies on this topic have shown different non-uniform pressure patterns. Therefore, a full understanding of the interaction between tires and pavement is necessary to obtain more accurate pavement responses. The objective of this study was to evaluate the effects of truck tire contact pressure on pavement responses at different loading conditions. A tire footprint system was used to capture contact pressure patterns statically and dynamically (low speed) at three inflation pressures and three wheel loads. All testing conditions were performed using a Heavy Vehicle Simulator HVS Mark VI with a five-rib tire type 11R22-5. A flexible pavement section instrumented with asphalt strain gauges, pressure cells and multi depth deflectometers was used to measure pavement responses. Measured tire-pavement contact stress data were input into a finite element analysis program to compute pavement responses and compare them to the measured responses. The contact pressure patterns obtained for the five-rib tire indicated that higher pressures were obtained for the inner ribs based on the controlled variables. In general, the results indicated that the contact area decreased for a given load as the inflation pressure was increased. Statistical analysis confirmed that pavement responses were significantly related to tire pressure distribution.
F. Leiva-Villacorta (&) A. Vargas-Nordcbeck J.P. Aguiar-Moya L. Loría-Salazar LanammeUCR, San José 11501-2060, Costa Rica e-mail: [email protected] A. Vargas-Nordcbeck e-mail: [email protected] J.P. Aguiar-Moya e-mail: [email protected] L. Loría-Salazar e-mail: [email protected] © Springer International Publishing Switzerland 2016 J.P. Aguiar-Moya et al. (eds.), The Roles of Accelerated Pavement Testing in Pavement Sustainability, DOI 10.1007/978-3-319-42797-3_45
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1 Introduction The contact footprint patterns of a vehicle tire on a pavement structure and its corresponding pressure distribution related to the vehicle load variation may indicate the tire quality and the state of the tire wear and tear. Accordingly, measurement of a tire’s contact footprint pattern and pressure distribution is useful in determining stress concentrations and determining possible causes of typical pavement distresses. Pavement responses are closely related to long term pavement performance and distress. Fatigue cracking and rutting, two major flexible pavements distresses, could be related to immediate pavement responses and could be explained in a mechanistic way. Horizontal tensile strains at the bottom of the asphalt concrete layer can explain fatigue cracks that initiate at the bottom and progress to the pavement surface. In contrast, pavement cracks can also start at the pavement surface due to excessive
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