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- W769747583 abstract "A new method for the dynamic evaluation of rigid pavements with overlays is presented. The method uses a vibratory nondestructive testing device (Road Rater 2008), a dynamic signal analyzer (HP3562A), and a microcomputer (MS-DOS compatible). A microcomputer FORTRAN program, GREEN-MA, has been written which uses Green's functions to calculate dynamic structural responses of layered systems subjected to harmonic loads. A backcalculation algorithm, COMDEF, has been modified to include the dynamic deflections calculated by GREEN-MA. Dynamic theory allows the use of more data from a single test than would normally be utilized. When analyzing data from a nondestructive testing device, the typical data include the force and peak deflection measurements. By monitoring the sensor outputs with a dynamic signal analyzer, the data set can easily be increased to include the phase shifts between sensors. Use of phase data allows the determination of a real deflection basin which represents a photograph of the deflection basin at a given instant. Many authors have written about the need for true dynamic analysis of nondestructive test data. The major reason for continued use of quasistatic theory in backcalculation has been the large amounts of computer time required to generate true dynamic comparison solutions. A database approach is used by the COMDEF program to speed the calculation of comparison solutions, so that true dynamic backcalculation can be achieved quickly and accurately." @default.
- W769747583 created "2016-06-24" @default.
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- W769747583 date "1989-04-01" @default.
- W769747583 modified "2023-09-27" @default.
- W769747583 title "A TRUE DYNAMIC METHOD FOR NONDESTRUCTIVE TESTING OF RIGID PAVEMENTS WITH OVERLAYS. PROCEEDINGS, 4TH INTERNATIONAL CONFERENCE ON CONCRETE PAVEMENT DESIGN AND REHABILITATION, PURDUE UNIVERSITY, APRIL 18-20, 1989" @default.
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