Modeling of the FWD Deflection Basin to Evaluate Airport Pavements
Publication: International Journal of Geomechanics
Volume 14, Issue 2
Abstract
The falling weight deflectometer (FWD) testing develops a deflection basin on the pavement surface. Depths of this deflection basin from the center of the falling weight are measured at different radial offsets. These deflections are used for the backcalculation of the pavement layer moduli. Most of the available backcalculation software uses the layered elastic theory and static load to calculate moduli from known pavement surface deflections. However, the FWD test load is dynamic, and layer materials may show nonelastic behavior. Layered elastic theory in these types of software cannot characterize dynamic response of the pavement. Also, elastic theory is unable to accurately predict the surface deflection whenever stress developed in any pavement layer exceeds the yield point. For this reason, this study has performed a finite-element analysis of the airport pavement under the FWD test considering the dynamic load and materials plasticity. The analysis presented here includes elastoplastic behavior of pavement layer materials. Both axisymmetric and quarter cube models have been developed in ABAQUS. Time-deflection histories are simulated to match the FWD test data. A comparison is made between the dynamic, static, and field deflection basins. Contours of vertical deflection and strain are also plotted to observe their distribution on both the axisymmetric and quarter cube models. Analysis results show that the time-deflection histories are in close agreement with the field data. The axisymmetric model yields better results than the quarter cube model. Deflections from the static analysis are greater than the dynamic analysis for an identical set of the layer modulus of elasticity. A uniform distribution of strain is observed from the static analysis in both of the geometries. However, the dynamic analysis does not show similar distribution because of the time-dependent response.
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Acknowledgments
The authors thank the NMDOT, Aviation Division for funding this study. Special thanks go to the NMDOT field exploration team for their sincere effort behind the asphalt coring, soil sampling, and FWD data collection from Runway 12/30 of Clayton Airport.
References
ABAQUS. (2010). ABAQUS 6-10 EF-2 documentation, Dassault Systèmes Simulia, Providence, RI.
Ameri, M., Yavari, N., and Scullion, T. (2009). “Comparison of static and dynamic backcalculation of flexible pavement layers moduli, using four softwares.” Asian J. of Applied Sciences, 2(3), 197–210.
Chen, W. F., and Mizuno, E. (1990). “Nonlinear analysis in soil mechanics: Theory and implementation.” Developments in geotechnical engineering, Vol. 53, Elsevier, Amsterdam, Netherlands.
Cho, Y. H., McCullough, B. F., and Weissmann, J. (1997). “Considerations on finite element method application in pavement structural analysis.” Transportation Research Record 1539, Transportation Research Board, Washington, DC, 96–101.
Dong, Q., Matsui, K., and Yamamoto, K. (2001). “Time domain backcalculation of pavement structure material properties using 3D FEM with Ritz vectors.” Int. J. Geomech., 325–336.
Duncan, J. M., Monismith, C. L., and Wilson, E. L. (1968). “Finite element analysis of pavements.” Highway Research Record No. 228, Highway Research Board, Washington, DC.
Dunlop, P., Duncan, J. M., and Seed, H. B. (1968). “Finite element analysis of slopes in soil.” Rep. TE 68-3, Univ. of California, Berkeley, CA.
El-Badawy, S. M., and Witczak, M. W. (2007). “Development of a universal permanent strain model for the subgrade pavement materials.” Proc., Transportation Research Board 86th Annual Meeting (CD-ROM), Transportation Research Board, Washington, DC.
Garg, N., and Thompson, M. R. (1997). “Triaxial characterization of Minnesota Road Research Project granular materials.” Transportation Research Record 1577, Transportation Research Board, Washington, DC, 27–36.
Haddad, Y. M. (1995). Viscoelasticity of engineering materials, 1st Ed., Chapman & Hall, New York.
Highway Research Board. (1962). “The AASHO Road Test 5 pavement research.” Washington, DC.
Hjelmstad, K. D., Zuo, Q., and Kim, J. (1997). “Elastic pavement analysis using infinite elements.” Transportation Research Record 1568, Transportation Research Board, Washington, DC, 72–76.
Hoffman, M. S. (1983). “Loading mode effects on pavement deflections.” J. Transp. Eng., 651–667.
Huang, Y. H. (2004). Pavement analysis and design, 2nd Ed., Pearson, Upper Saddle River, NJ.
Irwin, L. H. (2002). “Backcalculation: An overview and perspective.” 〈https://docs.google.com/file/d/0BwRtUOIxzlF4eGVXRzFFZVY0QWM/edit?pli=1〉 (Nov. 29, 2009).
KENPAVE. (2004). “KENPAVE: A computer package for pavement analysis and design.” Univ. of Kentucky, Lexington, KY.
Kim, D. G. (2004). “Development of a constitutive model for resilient modulus of cohesive soils.” Ph.D. thesis, Dept. of Civil Engineering, Ohio State Univ., Columbus, OH.
Kim, M., Tutumluer, E., and Kwon, J. (2009). “Nonlinear pavement foundation modeling for three-dimensional finite-element analysis of flexible pavements.” Int. J. Geomech., 195–208.
Koswara, H. (1983). “A finite element analysis of underground shelter subjected to ground shock load.” M.S. thesis, Rose-Hulman Institute of Technology, Terre Haute, IN.
Kuo, C. M., and Chou, F. J. (2004). “Development of 3-D finite element model for flexible pavements.” J. Chin. Inst. Chem. Eng,., 27(5), 707–717.
Logan, D. L. (2007). A first course in the finite element method, 4th Ed., Thomson, Toronto.
Lukanen, E. O. (1993). “Effects of buffer on falling weight deflectometer loadings and deflections.” Transportation Research Record 1355, Transportation Research Board, Washington, DC, 37–51.
Lytton, R. L., et al. (1993). “Development and validation of performance prediction models and specifications for asphalt binders and paving mixes.” Rep. SHRP A-357, Transportation Research Board, Washington, DC.
Meier, R. W., and Rix, G. J. (1998). “Backcalculation of flexible pavement moduli from falling weight deflectometer data using artificial neural networks.” Chapter 7, ASCE manuals and reports on engineering practice, ASCE, Reston, VA, 162–190.
Nam, D. (1994). “Effect on slab flexibility on the vertical stiffness of circular foundations.” M.S. thesis, Univ. of Texas at Austin, Austin, TX.
National Cooperative Highway Research Program (NCHRP). (2008). Mechanistic-empirical pavement design guide, Interim Ed., Transportation Research Board, Washington, DC.
Nazarian, S., and Boddapati, K. M. (1995). “Pavement-falling weight deflectometer interaction using dynamic finite element analysis.” Transportation Research Record 1482,Transportation Research Board, Washington, DC, 33–43.
Schwartz, C. W. (2002). “Effect of stress-dependent base layer on the superposition of flexible pavement solutions.” Int. J. Geomech., 331–352.
Sebaaly, B. E., Mamlouk, M. S., and Davies, T. G. (1986). “Dynamic analysis of falling weight deflectometer data.” Transportation Research Record 1070, Transportation Research Board, Washington, DC, 63–68.
Shoukry, S. N., Martinelli, D. R., and Selezneva, O. I. (1996). “Dynamic considerations in pavement layers moduli evaluation using falling weight deflectometer.” Int. Soc. for Optical Eng., 2946, 109–119.
Thompson, M. R. (1982). ILLI-PAVE, user’s manual, Transportation Research Facilities, Dept. of Civil Engineering, Univ. of Illinois, Urbana, Champaign, IL.
Uddin, W. (2008). “3D-FE dynamic analysis of pavements subjected to nondestructive impact testing.” NED University Journal of Research, 5(1), 1–15.
Uddin, W., and Garza, S. (2010). “3D-FE simulation study of structural response analysis for pavement-subgrade systems subjected to dynamic loads.” Proc., Pavements and materials: Testing and modeling in multiple length scales, ASCE, Reston, VA, 170–181.
Uddin, W., Hackett, R. M., Joseph, A. P., and Algred, B. (1995). “Three-dimensional finite-element analysis of jointed concrete pavement with discontinuities.” Transportation Research Record 1482, Transportation Research Board, Washington, DC, 26–32.
Uddin, W., Hackette, R. M., Noppakunwijai, P., and Pan, Z. (1996). “Three-dimensional finite element simulation of FWD loading on pavement systems.” Meeting the Challenge: Proc., 24th Int. Air Transportation Conf., ASCE, Reston, VA, 284–294.
U.S. Army Corps of Engineers. (2003). “Engineering and design—Slope stability.” Rep. EM 1110-2-1902, Washington, DC.
Van Metzinger, W. A., and McCullough, B. F. (1991). “An empirical-mechanistic design method using bonded concrete overlays for the rehabilitation of pavements.” Rep. No. 1205-1, Center for Transportation Research, Univ. of Texas at Austin, Austin, TX.
Xia, K. (2010). “Finite element modeling of dynamic tire/pavement interaction.” Proc., Pavements and materials: Testing and modeling in multiple length scales, ASCE, Reston, VA, 204–214.
Yamada, Y. (1970). “Dynamic analysis of civil engineering structures.” Recent advances in matrix methods of structural analysis and design, University of Alabama Press, Tuscaloosa, AL, 487–512.
Yin, D., and Mrawira, D. (2009). “Comparison between laboratory investigation and non-destructive testing methods for mechanistic characterization of asphalt pavement.” Proc., 88th Annual Meeting of Transportation Research Board, Transportation Research Board, Washington, DC.
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© 2014 American Society of Civil Engineers.
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Received: Jun 26, 2012
Accepted: Apr 5, 2013
Published online: Apr 8, 2013
Published in print: Apr 1, 2014
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