Modeling and Computing for Layered Pavements Under Vehicle Loading

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dc.contributor.advisor N. Paul Khosla, Committee Member en_US
dc.contributor.advisor M. Shamimur Rahman, Committee Chair en_US
dc.contributor.advisor Akhtarhusein A. Tayebali, Committee Co-Chair en_US
dc.contributor.advisor Mohammed A. Gabr, Committee Member en_US Xu, Qingxia en_US 2010-04-02T19:16:01Z 2010-04-02T19:16:01Z 2004-08-23 en_US
dc.identifier.other etd-05252004-152145 en_US
dc.description.abstract The objective of this research is to develop and implement some numerical models to analyze pavement responses under vehicle loading. Firstly, to study the pavement delamination problem, the pavement structure is modeled as an elastic finite layer system subjected to vertical and horizontal loadings over circular areas. By using the finite layer method, the maximum interface shear stress are determined; the maximum interface shear stress can be used to compare with the interface shear strength obtained through simple shear testing to determine reasonable pavement design parameters to prevent delamination failure. Secondly, the responses of a linear viscoelastic pavement system, with asphalt concrete layer of viscoelastic properties, subjected to vertical circular loadings, are analyzed by finite element method using three algorithms: (i) direct time integration; (ii) Fourier transform; (iii) Laplace transform. The inverse Fast Fourier Transform algorithm and the numerical inversion of Laplace transform method of Honig and Hirdes are used. The numerical results of the quasi-static responses by the three algorithms are presented and compared with respect to their accuracy and computational efficiency. To use the viscoelastic model in the pavement analysis, the parameters of the generalized Maxwell model based on the frequency sweep test results are determined by using the software IRIS, which is then assigned as the property of the asphalt concrete layer in a typical pavement structure subjected to a standard dual tire axle loading. Results for the distributions of stress and strain at various times are presented. In the last part of the research, a preliminary study is presented for permanent deformation of asphalt concrete. A simplified one-dimensional elasto-visco-plastic model is implemented and used to analyze the visco-plastic deformation of a cylindrical asphalt concrete sample under one-dimensional loading. en_US
dc.rights I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to NC State University or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. en_US
dc.subject fatigue life en_US
dc.subject pavement delamination en_US
dc.subject permanent deformation en_US
dc.subject Laplace transform en_US
dc.subject viscoelastic model en_US
dc.subject Fourier transform en_US
dc.subject finite element method en_US
dc.subject elasto-visco-plastic model en_US
dc.title Modeling and Computing for Layered Pavements Under Vehicle Loading en_US PhD en_US dissertation en_US Civil Engineering en_US

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