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Evaluation of FWD software and deflection basin for airport pavements

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Please use this identifier to cite or link to this item: http://hdl.handle.net/1928/11076

Evaluation of FWD software and deflection basin for airport pavements

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Title: Evaluation of FWD software and deflection basin for airport pavements
Author: Ahmed, Mesbah Uddin, 1983-
Advisor(s): Tarefder, Rafiqul
Committee Member(s): Ng, Tang -Tat
Stormont, John
Department: University of New Mexico. Dept. of Civil Engineering
Subject(s): FWD
Modulus
LC Subject(s): Runways (Aeronautics)--Testing--Data processing.
Pavements--Testing--Data processing.
Nondestructive testing--Data processing.
Structural analysis (Engineering)--Statistical methods.
Finite element method.
Degree Level: Masters
Abstract: Falling Weight Deflectometer (FWD) test data are processed by backcalculation software to obtain modulus of layer materials of airport pavements. Currently, several backcalculation software are available. However it is not known which software produces accurate and consistence modulus values. In this study three backcalculation software; namely, BAKFAA, EVERCALC, and MODULUS are evaluated for consistency and accuracy. To examine accuracy, software predicted modulus values are compared to the laboratory tested modulus values of soils, aggregate, and asphalts. Consistency is examined by statistical analysis using three sets of FWD deflection data produced by three loads with magnitudes of 9, 12, and 16 kip at an identical location of an airport pavement. It is shown that EVERCALC software produces more consistent and accurate modulus values than the BAKFAA and MODULUS software. A concern with the available backcalculation software is that their analysis algorithms are based on layered elastic theory with linear materials models. In addition, they consider static loading, which is not the true representation of the dynamic loads applied in a FWD test in the field. To this end, this study performs a dynamic analysis of the FWD deflection basin using a finite element method (FEM) with the consideration of non-linear materials models. Results show that FEM predicted deflections have similar trends of the field measured deflections. However, a number of trial combinations of inputs and FEM models may be required to produce an identical match between the predicted and measured deflections. It is recommended that this approach be the subject of future studies.
Graduation Date: July 2010
URI: http://hdl.handle.net/1928/11076

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