Development of reliable pavement models.

Details

• Creators:
  Aguiar-Moya, José Pablo ; Prozzi, Jorge
• Corporate Creators:
  University of Texas at Austin. Center for Transportation Research
• Subject/TRT Terms:
  • Pavement design
  • Paving
  • Mathematical models
  • Pavements--Design and construction--Mathematical models
• Publication/ Report Number:
  SWUTC/11/161025-1
• Resource Type:
  Tech Report
• Geographical Coverage:
  Texas
• Corporate Publisher:
  Southwest Region University Transportation Center (U.S.)
• Abstract:
  The current report proposes a framework for estimating the reliability of a given pavement structure as analyzed by ; the Mechanistic-Empirical Pavement Design Guide (MEPDG). The methodology proposes using a previously fit ; response surface, in place of the time-demanding implicit limit state functions used within the MEPDG, in ; combination with an analytical approach to estimating reliability using First-Order and Second-Order Reliability ; Methods (FORM and SORM). Additionally, in order to assess the accuracy of the FORM and SORM reliability ; estimates, Monte Carlo simulations are also performed. ; A case study based on a three-layered pavement structure is used to demonstrate the methodology. Several ; pavement design variables are treated as random; these include HMA and base layer thicknesses, base and ; subgrade modulus, and HMA layer binder and air void content. Information on the variability and correlation ; between these variables are obtained from the Long-Term Pavement Performance (LTPP) program. ; Response surfaces for limit states dealing with HMA rutting failure are fit using several runs of the MEPDG based ; on a factorial design of combinations among the aforementioned random variables, as well as traffic, structural, and ; climatic considerations. These response surfaces are then used to analyze the reliability of the given pavement ; structure. ; Using the second moment and simulation techniques, it was found that on average the reliability estimate by the ; MEPDG is very conservative. Additionally, the validity of the methodology is verified by means of direct ; simulation using the MEPDG. Finally, recommendations on fitting the response surface are provided to ensure the ; applicability of the methodology.
  More +
• Format:
  PDF
• Funding:
  10727
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/23110/dot_23110_DS1.pdf
• File Type:
  [PDF - 4.51 MB]
• Collection(s):
  University Transportation Centers ; US Transportation Collection
• Main Document Checksum:
  urn:sha-512:5fae747f5cb89e66b4225f1279a7e8b91f555bf01362ac954f572f98d21d08ef8b6151e3f014b17681bac3a86353e7c15cfff0abe864459da207be798edcf9b3