Strains in Asphalt Pavements Under Circular and Rectangular Footprints
DOI:
https://doi.org/10.3846/bjrbe.2014.13Keywords:
rectangular footprint, circular footprint, multi-layered elastic analysis, flexible pavementsAbstract
The analysis of flexible pavements is usually carried out by the Linear Elastic Theory in axial-symmetric configuration, and by assuming that stresses are uniformly distributed over a circular footprint. The application of these methods requires simple computations, but beside this, the approximation of the real geometry with circular footprints causes erroneous results in the stress-strain response and therefore in the damage analysis. Rectangular footprint is closer to the real shape of the tire/pavement contact area. This paper aims to identify some relations to evaluate the effective strains induced in pavements by rectangular footprint loads by considering an equivalent single or group of circular footprints. In order to achieve this goal, pavement response was evaluated for different variable combinations both by ViscoRoute 2.0 software for the rectangular footprint, and by an elastic model for the circular footprint in axial-symmetric configuration; results obtained by the two analyses were compared in order to develop two different models. The first model proposes a correction coefficient λ of the radius of the circular area to be used for calculating strains beneath the centre of the rectangular footprint. The correction coefficient λ calculated for different variable configurations were related to those variables regarded as significant by means of a multivariate regression. In the second model, in order to calculate strains outside the rectangular footprint, the superposition of circular footprints that better approximates the rectangular ones was determined.
References
Alkasawneh, W.; Pan, E.; Green, R. 2008. The Effect of Loading Configuration and Footprint Geometry on Flexible Pavement Response Based on Linear Elastic Theory, Road Materials and Pavement Design 9(2): 159–179.
Blab, R. 1999. Introducing Improved Loading Assumptions into Analytical Pavement Models Based on Measured Contact Stresses of Tires, in The International Conference on Accelerated Pavement Testing, Reno, NV, 1999.
Chabot, A.; Chupin, O.; Deloffre, L.; Duhamel, D. 2010. A Tool for the Simulation of Moving Load Effects on Asphalt Pavement, RMPD Special Issue on Recent Advances in Numerical Simulation of Pavements 11(2): 227–250. http://dx.doi.org/10.3166/rmpd.11.227-250
De Beer, M.; Fisher, C. 1997. Contact Stresses of Pneumatic Tires Measured with the Vehicle-Road Surface Pressure Transducer Array (VRSPTA) System for the University of California at Berkeley (UCB) and the Nevada Automotive Test Center (NATC). CSIR Report CR-97/053. Council for Scientific and Industrial Research, Pretoria, South Africa.
Duhamel, D.; Chabot, A.; Tamagny, P.; Harfouche, L. 2005. Viscoroute: Visco-Elastic Modeling for Asphalt Pavements, Bulletin des Laboratoires des Ponts et chaussees 258–259: 89–103. Available from Internet: http://www.lcpc.fr/en/sources/blpc/index.php
Hajj, E.; Thushanthan, P.; Sebaaly, P. E.; Siddharthan, R. V. 2012. Influence of Tire-Pavement Stress Distribution, Shape, and Braking on Asphalt Pavement Performance Predictions, Transportation Research Record 2306: 73–85. http://dx.doi.org/10.3141/2306-09
Losa, M.; Di Natale, A. 2014. Accuracy in Predicting Visco-Elastic Response of Instrumented Asphalt Pavements, in Proc. of the 3rd International Conference on Transportation Infrastructure (ICTI 2014). Sustainability, Eco-efficiency and Conservation in Transportation Infrastructure Asset Management. April 22‒25, 2014, Pisa, Italy, Taylor & Francis Group. 339–346.
Losa, M.; Di Natale, A. 2012. Evaluation of the Representative Loading Frequency in Asphalt Pavements, Transportation Research Record 2305: 150–161. http://dx.doi.org/10.3141/2305-16
Losa, M.; Bacci, R.; Leandri, P. 2008. A Statistical Model for Prediction of Critical Strains in Pavements from Deflection Measurements, Road Materials and Pavement Design 9(Supplement 1): 373–396. http://dx.doi.org/10.1080/14680629.2008.9690175
Novak, M.; Brigission, B.; And Roque, R. 2003. Tire Contact Stresses and Their Effects on Instability Rutting of Asphalt Mixture Pavements, Transportation Research Record 1853: 150–156. http://dx.doi.org/10.3141/1853-17
Park, D. W.; Fernando, E.; Leidy, J. 2005a. Evaluation of Predicted Pavement Response with Measured Tire Contact Stresses, Transportation Research Record 1919: 160–170. http://dx.doi.org/10.3141/1919-17
Park, D. W.; Martin, A. E.; Masad, E. 2005b. Effects of Nonuniform Tire Contact Stresses on Pavement Response, Journal of Transportation Engineering 131(11): 873–879. http://dx.doi.org/10.1061/(ASCE)0733-947X(2005)131:11(873)
Wang, F.; Machemehl, R. B. 2006. Mechanistic-Empirical Study of Effects of Truck Tire Pressure on Pavement: Measured Tire-Pavement Contact Stress Data, Transportation Research Record 1947: 136–145. http://dx.doi.org/10.3141/1947-13
Weissman, S. L. 1999. Influence of Tire-Pavement Contact Stress Distribution on Development of Distress Mechanism in Pavements, Transportation Research Record 1655: 161–167. http://dx.doi.org/10.3141/1655-21
Yue, Z. Q.; Svec, O. J. 1995. Effects of Tire-Pavement Pressure Distribution on the Response of Asphalt Concrete Pavements, Canadian Journal of Civil Engineering 22(5): 849–860. http://dx.doi.org/10.1139/l95-103
Downloads
Published
Issue
Section
License
Copyright (c) 2014 Vilnius Gediminas Technical University (VGTU) Press Technika
This work is licensed under a Creative Commons Attribution 4.0 International License.
How to Cite
