原文传递
SIMPLE DYNAMIC BACKCALCULATION PROCEDURE FOR FALLING WEIGHT DEFLECTOMETER TESTING OF RIGID PAVEMENTS.
| 题名： | SIMPLE DYNAMIC BACKCALCULATION PROCEDURE FOR FALLING WEIGHT DEFLECTOMETER TESTING OF RIGID PAVEMENTS. |
| 作者： | Chatti-K; Kim-TK |
| 关键词： | American-Association-of-State-Highway-and-Transp-Officials; Backcalculation-; Coefficient-of-subgrade-reaction; Coefficients-; Damping-Physics; Deflection-; Equations-; Falling-weight-deflectometers; Fast-Fourier-transforms; Rigid-pavements; Stiffness-; Subgrade-Pavements; Validation- |
| 摘要： | A simple and direct method for backcalculation of the dynamic subgrade stiffness and damping coefficients from falling weight deflectometer (FWD) deflection basins is presented. The method can also be used to detect a stiff layer underneath the pavement system. The method consists first of decomposition of the transient deflection signal of each sensor into a series of harmonic motions by the fast Fourier transform algorithm. Then, for each frequency of interest, the real and imaginary components of the displaced volume underneath the slab are calculated from the complex deflection basin. The dynamic force-displacement relationship is decomposed into real and imaginary parts, leading to a simple system of equations that can easily be solved for the coefficient of the subgrade reaction (k) and the radiation damping coefficient (c). The method was verified by using FWD test data from six different sites in Michigan. In addition, the backcalculated k-values were compared with those obtained by the American Association of State Highway and Transportation Officials (AASHTO)-recommended (static) backcalculation method. The results obtained by the new procedure showed very good agreement and consistency with those obtained by the AASHTO method. |
| 总页数： | Transportation Research Record. 2001. (1764) pp30-38 (16 Fig., 2 Tab., 6 Ref.) |
| 报告类型： | 科技报告 |
相关文献
- BACKCALCULATION OF LAYER PARAMETERS FOR LTPP TEST SECTIONS, Volume 1: Slab on Elastic Solid and Slab on Dense-Liquid Foundation Analysis of Rigid Pavements
- SIMPLE APPROACH TO ESTIMATION OF PAVEMENT STRUCTURAL CAPACITY.
- Pavement Management 2014, Volume 3. Transportation Research Record: Journal of the Transportation Research Board, No. 2457
- Pavement Management 2014, Volume 3. Transportation Research Record: Journal of the Transportation Research Board, No. 2457.
- PAVEMENT-FALLING WEIGHT DEFLECTOMETER INTERACTION USING DYNAMIC FINITE-ELEMENT ANALYSIS.
- Pavement Management 201, Volume 3. Transportation Research Record: Journal of the Transportation Research Board, No. 2525.
检索历史
应用推荐
