NDLI: Energy-based method to determine equivalent frequency for HMA

Content Provider	IEEE Xplore Digital Library
Author	Chunbao Xiong Haiying Ai Ligang Lei
Copyright Year	2011
Description	Author affiliation: Dept. of Civil & Environmental Engr., Michigan State University, East Lansing, 48824, USA (Ligang Lei) \|\| School of Civil Engineering, Tianjin University, 300072, China (Chunbao Xiong; Haiying Ai)
Abstract	Dynamic modulus (\|E*\|) master curve is the fundamental material property of asphalt concrete (AC) mixture, which illustrates the time and temperature dependency for hot mix asphalt (HMA), and it is a crucial input to the new ME-PDG, expressed as Witczak's equation, or sigmoidal function. To obtain the equivalent elastic modulus of the AC layer corresponding to a specific load, the vehicle speed and pavement structure need to be considered together. In this paper, the equivalent frequency in new ME-PDG is briefly introduced first, and then a theoretical formula for the proposed equivalent frequency is derived, based on the principle of energy conservation, or the Parseval's theorem. Field Falling Weight Deflectometer (FWD) test is simulated by the Finite Element Method (FEM) software ABAQUS, and deflection history is compared between dynamic response and static response, which is almost identical to the linear layered elastic theory with the elastic modulus of AC layer at equivalent frequency. Followed by the theoretical solution of spectral element method with the interpolation of influence line, a special truck load is applied on typical thick pavement and thin pavement, and the magnitude of longitudinal strain at the bottom of AC and the vertical strain at the top of subgrade are compared with linear elastic solution from KENLAYER. Both results show that the proposed equivalent frequency works well to simply AC layer as visco-elastic material with constant elastic modulus and Poisson's Ratio.
Starting Page	287
Ending Page	291
File Size	352599
Page Count	5
File Format	PDF
ISBN	9781457702891
e-ISBN	9781457702907
DOI	10.1109/ICETCE.2011.5775727
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-04-22
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Damping Equivalent frequency Finite element method Spectral element analysis Principle of energy conservation Loading Time frequency analysis Tires History Finite element methods Strain
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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