{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/83360"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/83360","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Three-Dimensional Finite Element Analysis of Flexible Pavements Considering Nonlinear Pavement Foundation Behavior","abstract":"With the current move towards adopting mechanistic-empirical concepts in the design of pavement structures, state-of-the-art mechanistic analysis methodologies are needed to determine accurate pavement responses, such as stress, strain, and deformation. This research has focused on the nonlinear modulus and deformation behavior of pavement foundation geomaterials, i.e., fine-grained subgrade soils and unbound aggregates used in untreated base/subbase layers, due to repeated wheel loading. This nonlinear behavior is commonly characterized by stress dependent resilient modulus material models that need to be incorporated into finite element based mechanistic pavement analysis methods to predict more accurately critical pavement responses. This dissertation describes the development of a finite element mechanistic analysis model for both the axisymmetric and three-dimensional analyses of flexible pavements. To properly characterize the resilient behavior of pavement foundations, nonlinear stress-dependent modulus models have been programmed in a User Material Subroutine (UMAT) in the general-purpose finite element program ABAQUS(TM). The developed UMAT is verified first with the results of a well established axisymmetric nonlinear pavement analysis finite element program, GT-PAVE. Next, the UMAT subroutine performance is also validated with the instrumented full scale pavement test section study results from the Federal Aviation Administration's National Airport Pavement Test Facility. The predicted responses at different locations in the test sections are compared with the field measured responses under different sections and load levels to indicate that proper characterizations of the nonlinear, stress-dependent geomaterials make a significant impact on accurately predicting measured pavement responses from three-dimensional pavement analyses. Different resilient modulus models developed from conventional and true triaxial test data on unbound granular materials are also studied. When the intermediate principal stresses are taken into account in the three-dimensional modulus model development unlike in the axisymmetric models, large discrepancies are obtained in the computed pavement responses when compared to those from the axisymmetric nonlinear finite element analyses. Finally, as an important application of the developed UMAT nonlinear material subroutine in the analysis of flexible pavements subjected to multiple axle/wheel loads, load spreading and nonlinear modulus distributions of pavement layers are found to considerably impact pavement surface deflections and critical pavement responses.","abstract_html":"With the current move towards adopting mechanistic-empirical concepts in the design of pavement structures, state-of-the-art mechanistic analysis methodologies are needed to determine accurate pavement responses, such as stress, strain, and deformation. This research has focused on the nonlinear modulus and deformation behavior of pavement foundation geomaterials, i.e., fine-grained subgrade soils and unbound aggregates used in untreated base/subbase layers, due to repeated wheel loading. This nonlinear behavior is commonly characterized by stress dependent resilient modulus material models that need to be incorporated into finite element based mechanistic pavement analysis methods to predict more accurately critical pavement responses. This dissertation describes the development of a finite element mechanistic analysis model for both the axisymmetric and three-dimensional analyses of flexible pavements. To properly characterize the resilient behavior of pavement foundations, nonlinear stress-dependent modulus models have been programmed in a User Material Subroutine (UMAT) in the general-purpose finite element program ABAQUS(TM). The developed UMAT is verified first with the results of a well established axisymmetric nonlinear pavement analysis finite element program, GT-PAVE. Next, the UMAT subroutine performance is also validated with the instrumented full scale pavement test section study results from the Federal Aviation Administration's National Airport Pavement Test Facility. The predicted responses at different locations in the test sections are compared with the field measured responses under different sections and load levels to indicate that proper characterizations of the nonlinear, stress-dependent geomaterials make a significant impact on accurately predicting measured pavement responses from three-dimensional pavement analyses. Different resilient modulus models developed from conventional and true triaxial test data on unbound granular materials are also studied. When the intermediate principal stresses are taken into account in the three-dimensional modulus model development unlike in the axisymmetric models, large discrepancies are obtained in the computed pavement responses when compared to those from the axisymmetric nonlinear finite element analyses. Finally, as an important application of the developed UMAT nonlinear material subroutine in the analysis of flexible pavements subjected to multiple axle/wheel loads, load spreading and nonlinear modulus distributions of pavement layers are found to considerably impact pavement surface deflections and critical pavement responses.","abstract_has_math":false,"creators":["Kim, Minkwan"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Civil Engineering","degree_department":null,"school":null,"contributors":["Tutumluer, Erol"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-09-25T21:04:30Z","date_published":"2015-09-25T21:04:30Z","updated_at":"2026-07-22T22:26:21Z","subjects":["Engineering, Civil"],"languages":["eng"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["(MiAaPQ)AAI3301166"],"render_values":[{"text":"(MiAaPQ)AAI3301166","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/83360","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Tutumluer, Erol"]},{"key":"dc:creator","label":"Author","values":["Kim, Minkwan"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2015-09-25T21:04:30Z","10000-01-01","2007"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Civil Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Engineering, Civil"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/83360","(MiAaPQ)AAI3301166"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["With the current move towards adopting mechanistic-empirical concepts in the design of pavement structures, state-of-the-art mechanistic analysis methodologies are needed to determine accurate pavement responses, such as stress, strain, and deformation. This research has focused on the nonlinear modulus and deformation behavior of pavement foundation geomaterials, i.e., fine-grained subgrade soils and unbound aggregates used in untreated base/subbase layers, due to repeated wheel loading. This nonlinear behavior is commonly characterized by stress dependent resilient modulus material models that need to be incorporated into finite element based mechanistic pavement analysis methods to predict more accurately critical pavement responses. This dissertation describes the development of a finite element mechanistic analysis model for both the axisymmetric and three-dimensional analyses of flexible pavements. To properly characterize the resilient behavior of pavement foundations, nonlinear stress-dependent modulus models have been programmed in a User Material Subroutine (UMAT) in the general-purpose finite element program ABAQUS(TM). The developed UMAT is verified first with the results of a well established axisymmetric nonlinear pavement analysis finite element program, GT-PAVE. Next, the UMAT subroutine performance is also validated with the instrumented full scale pavement test section study results from the Federal Aviation Administration's National Airport Pavement Test Facility. The predicted responses at different locations in the test sections are compared with the field measured responses under different sections and load levels to indicate that proper characterizations of the nonlinear, stress-dependent geomaterials make a significant impact on accurately predicting measured pavement responses from three-dimensional pavement analyses. Different resilient modulus models developed from conventional and true triaxial test data on unbound granular materials are also studied. When the intermediate principal stresses are taken into account in the three-dimensional modulus model development unlike in the axisymmetric models, large discrepancies are obtained in the computed pavement responses when compared to those from the axisymmetric nonlinear finite element analyses. Finally, as an important application of the developed UMAT nonlinear material subroutine in the analysis of flexible pavements subjected to multiple axle/wheel loads, load spreading and nonlinear modulus distributions of pavement layers are found to considerably impact pavement surface deflections and critical pavement responses.","Made available in DSpace on 2015-09-25T21:04:30Z (GMT). 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This research has focused on the nonlinear modulus and deformation behavior of pavement foundation geomaterials, i.e., fine-grained subgrade soils and unbound aggregates used in untreated base/subbase layers, due to repeated wheel loading. This nonlinear behavior is commonly characterized by stress dependent resilient modulus material models that need to be incorporated into finite element based mechanistic pavement analysis methods to predict more accurately critical pavement responses. This dissertation describes the development of a finite element mechanistic analysis model for both the axisymmetric and three-dimensional analyses of flexible pavements. To properly characterize the resilient behavior of pavement foundations, nonlinear stress-dependent modulus models have been programmed in a User Material Subroutine (UMAT) in the general-purpose finite element program ABAQUS(TM). The developed UMAT is verified first with the results of a well established axisymmetric nonlinear pavement analysis finite element program, GT-PAVE. Next, the UMAT subroutine performance is also validated with the instrumented full scale pavement test section study results from the Federal Aviation Administration's National Airport Pavement Test Facility. The predicted responses at different locations in the test sections are compared with the field measured responses under different sections and load levels to indicate that proper characterizations of the nonlinear, stress-dependent geomaterials make a significant impact on accurately predicting measured pavement responses from three-dimensional pavement analyses. Different resilient modulus models developed from conventional and true triaxial test data on unbound granular materials are also studied. When the intermediate principal stresses are taken into account in the three-dimensional modulus model development unlike in the axisymmetric models, large discrepancies are obtained in the computed pavement responses when compared to those from the axisymmetric nonlinear finite element analyses. Finally, as an important application of the developed UMAT nonlinear material subroutine in the analysis of flexible pavements subjected to multiple axle/wheel loads, load spreading and nonlinear modulus distributions of pavement layers are found to considerably impact pavement surface deflections and critical pavement responses.","Made available in DSpace on 2015-09-25T21:04:30Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 3301166.pdf: 4744611 bytes, checksum: f47dad4706deb3711f827882a1484515 (MD5) Previous issue date: 2007","Embargo set by: Seth Robbins for item 84641 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","U of I Only","234 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2007."],"dc:identifier":["http://hdl.handle.net/2142/83360","(MiAaPQ)AAI3301166"],"dc:language":["eng"],"dc:subject":["Engineering, Civil"],"dc:title":["Three-Dimensional Finite Element Analysis of Flexible Pavements Considering Nonlinear Pavement Foundation Behavior"],"dc:type":["text"],"thesis:degree_discipline":["Civil Engineering"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:26:21Z"}