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Evaluation of FWD software and deflection basin for airport pavements


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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dc.contributor.author Ahmed, Mesbah Uddin, 1983-
dc.date.accessioned 2010-09-03T16:59:35Z
dc.date.available 2010-09-03T16:59:35Z
dc.date.issued 2010-09-03
dc.date.submitted July 2010
dc.identifier.uri http://hdl.handle.net/1928/11076
dc.description.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. en_US
dc.language.iso en en_US
dc.subject FWD en_US
dc.subject Modulus en_US
dc.subject.lcsh Runways (Aeronautics)--Testing--Data processing.
dc.subject.lcsh Pavements--Testing--Data processing.
dc.subject.lcsh Nondestructive testing--Data processing.
dc.subject.lcsh Structural analysis (Engineering)--Statistical methods.
dc.subject.lcsh Finite element method.
dc.title Evaluation of FWD software and deflection basin for airport pavements en_US
dc.type Thesis en_US
dc.description.degree Civil Engineering en_US
dc.description.level Masters en_US
dc.description.department University of New Mexico. Dept. of Civil Engineering en_US
dc.description.advisor Tarefder, Rafiqul
dc.description.committee-member Ng, Tang -Tat
dc.description.committee-member Stormont, John

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