New Procedure for Pavement Parameter Identification from Falling Weight Deflectometer Test

Abstract

A newly developed parameter identification procedure for pavement structures that uses the falling weight deflectometer (FWD) test is presented. The procedure involves the development of both forward and inverse models. The spectral element technique is used for the formulation of the forward model. The spectral element contributes to the efficiency of the procedure because (a) it is able to describe a whole material layer by one element, which makes the system of equations very small, and (b) it is able to describe the transfer functions of the system exactly. The latter assists in the development of an efficient objective function for the inverse model. Some aspects of the formulation of the inverse model are presented. Two case studies that address use of the procedure for FWD data harmonization and the accuracy and robustness of the procedure are examined.

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References

van Gurp

Characterization of Seasonal Influences on Asphalt Pavements with the Use of Falling Weight Deflectometers. CIP–Data Koninklijke Bibliothek den Haag, Delft, Netherlands, 1995.

Magnuson

A. H.

, Lytton

R. L.

, and Briggs

R. C.

Comparison of Computer Predictions and Field Data for Dynamic Analysis of Falling Weight Deflectometer Data. In Transportation Research Record 1293, TRB, National Research Council, Washington, D.C., 1991, pp. 61–71.

Uzan

Dynamic Linear Back Calculation of Pavement Material Parameters. Journal of Transportation Engineering, Vol. 120, 1994, pp. 109–126.

Kausel

, and Roesset

J. M.

, Stiffness Matrices for Layered Soils. Bulletin of Seismological Society of America, Vol. 71, 1981, pp. 1743–1761.

Al-Khoury

, Scarpas

, Kasbergen

, and Blaauwendraad

Spectral Element Method for the Dynamic Interpretation of FWD Test Results. Presented at 79th Annual Meeting of the Transportation Research Board, Washington, D.C., 2000.

Lysmer

Lumped Mass Method for Rayleigh Waves. Bulletin of Seismological Society of America, Vol. 60, 1970, pp. 89–104.

Doyle

J. F.

Wave Propagation in Structures: Spectral Analysis Using Fast Discrete Fourier Transforms. Springer-Verlag, New York, 1997.

Al-Khoury

, Scarpas

, Kasbergen

, and Blaauwendraad

Spectral Element Technique for Efficient Parameter Identification of Layered Media. I. Forward Calculation. International Journal of Solids and Structures, Vol. 38, No. 9, 2001, pp. 1605–1623.

Brigham

E. O.

The Fast Fourier Transform and Its Applications. Prentice-Hall, Englewood Cliffs, N.J., 1988.

10.

Al-Khoury

, Scarpas

, Kasbergen

, and Blaauwendraad

Spectral Element Technique for Efficient Parameter Identification of Layered Media. II. Inverse Calculation. International Journal of Solids and Structures, in press.

11.

Press

W. H.

, Flannery

B. P.

, Teukolsky

S. A.

, and Vetterling

W. T.

Numerical Recipes: The Art of Scientific Computing. Cambridge University Press, Cambridge, United Kingdom, 1986.

12.

Scarpas

CAPA-3D Finite Element System—User’s Manual, Parts I, II, and III. Section of Structural Mechanics, Faculty of Civil Engineering and Geosciences, TU-Delft, Netherlands, 1993.