Influence of Tire Footprint Contact Area and Pressure Distribution on Flexible Pavement
Publication: Airfield and Highway Pavements 2021
ABSTRACT
Effect of tire-pavement contact pressure distribution on flexible pavement is generally complex and dynamic, and it is affected by tire types. In addition, there are several inconsistences in data analysis from several experimental studies in measuring contact pressure distribution between tire and pavement. The main purpose of this study is to evaluate the influence of tire footprint contact area and pressure distribution on flexible pavements. Tire-pavement contact stress and interaction model were simulated using 3D finite element for five layers (asphalt concrete, unbound base and subbase, compacted, and natural subgrade) of flexible pavement at various loads. An axisymmetric and tire-pavement 3D finite element model was developed. A good correlation agreement between contact area and deflection was observed. For thin and thick pavement in the static analysis, contact area reduced 3.5% and 3.8%, respectively, while the static deflection for thin pavement decreased from 43.5 mm when E = 0.01 to 30.5 mm when E = 100 GPa, reduction of 29.9%. Whereas for thick pavement, the deflection between static and rolling analysis was not significant, similar trends of deflection between thin and thick pavement were obtained. The tire’s finite element model was validated using measured contact area and deflection. The results of analysis were then compared to simplify the results of the modeling considering its effects on flexible pavement. This finding may have important implication for design of relatively thin asphalt surface layered than thick pavement.
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Airfield and Highway Pavements 2021
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© 2021 American Society of Civil Engineers.
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Published online: Jun 4, 2021
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