STP1198: Backcalculation of System Parameters for Jointed Rigid Pavements

    Hiltunen, DR
    Assistant Professor, The Pennsylvania State University, University Park, Pennsylvania

    Roque, R
    Assistant Professor, The Pennsylvania State University, University Park, Pennsylvania

    Pages: 15    Published: Jan 1994


    Abstract

    A procedure has been developed to backcalculate parameters required for the mechanistic evaluation of jointed rigid pavements. The two paramters are the coefficient of dowel/concrete interaction (G), and the coefficient of subgrade reaction (k) in the vicinity of the joint. The procedure involves two primary steps. First, actual FWD tests are conducted at the joints of the pavement system, and the deflection transfer efficiency and the surface deflection under the FWD load are determined. Next, a finite element model of the pavement system is used to determine the relationship between deflection transfer efficiency and surface deflection. This relationship is developed for a range of G and k values, holding all other input parameters fixed. With the two FWD measurements and the theoretical relationship between the two, the G and k parameters can be determined for the pavement system under evaluation.

    Keywords:

    backcalculation, coefficient of dowel/concrete interaction, coefficient of subgrade, reaction, deflection transfer efficiency, falling weight deflectometer, finite element method, joint


    Paper ID: STP18163S

    Committee/Subcommittee: D04.39

    DOI: 10.1520/STP18163S


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