![]() ![]() Therefore need to be considered in the backcalculation procedures (1). Inertia and damping of the pavement layers can be significant and Previous studies reported that the effects of The most common backcalculation programs in use today ar e based on static linear elastic theory, even though the FWDĪpplies an impact load. Rigid pavements in the American Association of State Highway OfficialsĮvaluation of the structural capacity of pavements from surfaceĭeflections measured by the falling weight deflectometer (FWD) isĭependent on the performance of the specific backcalculation algorithm used. The mechanistically evaluated correction factors were found to be in close agreement with the experience-based values recommended for flexible and Modulus is estimated for each program and pavement type. A correction factor for backcalculated subgrade The results indicate that the three programs haveĪn excellent capability of predicting the FEM-generated subgrade modulus values for flexible, composite, and rigid pavements provided that aĬorrection factor is used. Obtained from three backcalculation programs: MODCOMP, MODULUS, and EVERCALC. Theīackcalculated moduli using 3D FEM are compared with the results Matched by adjusting the values of layer moduli used in the FEM. The FWD-measured and FEM-generated deflection basins are ![]() Interfaces, and the 3D geometrical characteristics of the pavement structure. The falling weight deflectometer (FWD) load, friction at pavement-layer The modeling approach accounts for the dynamic nature of Three-dimensional (3D) finite-element model (FEM) is used to backcalculate the layer moduli of rigid, flexible, and composite pavement ![]() ![]() To the inability of replicating in laboratory tests the same consolidationĪnd stress conditions encountered in the field. Performance Evaluation of BackcalculationĬurrently, the only means of assessing the performance of a backcalculation algorithm is to compare its results with the values obtained through ![]()
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