MODCOMP 6.0 was used as the auxiliary program to backcalculate results for those LTPP sections that did not yield acceptable results with EVERCALC. More accurate estimation of modulus can save maintenance cost in the future. on pavement simulation rules, executing EVERCALC, and post-processing the results. Moduli of back-calculation using LEM and VEM methods were used to perform flexible pavement analysis, which showed that with an 8% reduction of modulus, the pavement service life reduced by 25%. However, for stiffer soil, the average error of back-calculation using the LEM and VEM method was 12.4% and 4.3%, respectively. In the case of low stiffness soil, the average error of back-calculation using the LEM and VEM was 53.1% and 14.8%, respectively. and the Instructional Guide for Back-Calculation and the Use of MODCOMP. MONDEFLFLXBAKCALPOINTInterpreted results of backcalculated elastic layer moduli from FWD measurements for flexible and rigid pavement structures using MODCOMP v4.2 computer program. The back-calculated modulus using the LEM and VEM was higher than that using the PLT. Layered elastic analysis for flexible and rigid pavements H. MONDEFLFLXBAKCALLAYERLayer structure and material inputs for the pavement backcalculation computations using MODCOMP v4.2 computer program. In situ test results showed that a time lag existed between the peaks of deflection and load, and load-deflection curves were nonlinear, which indicated the viscoelastic nature of the soil. The effectiveness of the proposed method was verified with the in situ plate load test (PLT) conducted on a highway embankment. Deflection data have been measured at periodic intervals with a falling weight deflectometer on all rigid, flexible, semi-rigid, and rehabilitated pavement test sections included in the Long-Term Pavement Performance (LTPP) program. The back-calculation program was compiled with MATLAB. widely used backcalculation algorithms: MODULUS, EVERCALC, and MODCOMP.
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A quasi-static dynamic analysis technique of Laplace transformation and a modified Gauss-Newton optimization algorithm were adopted in the proposed method. BACKCALCULATION OF PAVEMENT LAYERS MODULI USING 3D NONLINEAR EXPLICIT FINITE.
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#Pavement backcalculation modcomp portable
Abstract : To improve the accuracy of back-calculation of soil modulus using the portable falling weight deflectometer (PFWD), a viscoelastic method (VEM) overcoming the limitations of the conventional linear elastic method (LEM) was proposed.