Three -dimensional finite element analyses of flexible airport pavements for the next generation of aircrafts

Michael Willis, Dona Johnson, Beena Sukumaran

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Scopus citations

Abstract

With the advent of larger and heavier aircrafts with more complex wheel configurations, current design methods of airfield pavements are becoming inadequate. Current design procedures are typically conducted using a layered elastic approach, which assumes a two-dimensional environment with linear elastic material responses with theory of superposition to achieve the effect of multiple wheel loads. With the release of heavier aircraft with more complicated landing gears, the analysis situation has become more complex. The stress interactions between separate tires is not as simple to model; a two-dimensional model is incapable of modeling the three-dimensional problem of a triple-dual-tandem (TDT) axle used on B-777 and A380 aircraft. This paper documents the use of finite element analyses techniques to determine the failure mechanism in a pavement system under moving aircraft loads. The three-dimensionality of the failure surface under actual wheel loads with wander requires that computationally intensive three-dimensional models be used. The flexible pavement system that is modeled is comprised of a medium and low strength subgrade. The stress-strain response of the material is simulated using an elasto-plastic model. The finite element techniques employed are verified against available failure data from the National Airport Pavement Test Facility (NAPTF) of the Federal Aviation Administration based in Atlantic City. Several conclusions can be drawn from the analysis. The response of pavement structure using elastic properties does not accurately pzedict the pavement response. On the other hand, the elasto-plastic material model is able to emulate the response of pavement material. It is also seen that wander causes greater stresses and strains within the subgrade layer as well as greater upheaval when compared to models that neglect wander. The field of influence is also increased. The analysis which modeled the aircraft landing gear trafficking across the pavement section also indicates that pavements with less than 30 inches of pavement structure over the subgrade results in high levels of stress on the subgrade and adding additional subbase has diminishing returns in improving the pavement performance.

Original languageEnglish (US)
Title of host publicationAirfield and Highway Pavements
Subtitle of host publicationMeeting Today's Challenges with Emerging Technologies - Proceedings of the 2006 Airfield and Highway Pavement Specialty Conference
PublisherASCE - American Society of Civil Engineers
Pages13-24
Number of pages12
ISBN (Print)0784408386, 9780784408384
DOIs
StatePublished - 2006
Event2006 Airfield and Highway Pavement Specialty Conference - Atlanta, GA, United States
Duration: Apr 30 2006May 3 2006

Publication series

NameProceedings of the 2006 Airfield and Highway Pavement Specialty Conference
Volume2006

Other

Other2006 Airfield and Highway Pavement Specialty Conference
CountryUnited States
CityAtlanta, GA
Period4/30/065/3/06

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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    Willis, M., Johnson, D., & Sukumaran, B. (2006). Three -dimensional finite element analyses of flexible airport pavements for the next generation of aircrafts. In Airfield and Highway Pavements: Meeting Today's Challenges with Emerging Technologies - Proceedings of the 2006 Airfield and Highway Pavement Specialty Conference (pp. 13-24). (Proceedings of the 2006 Airfield and Highway Pavement Specialty Conference; Vol. 2006). ASCE - American Society of Civil Engineers. https://doi.org/10.1061/40838(191)2