ANALYSIS AND SYNTHESIS OF HIGHWAY PAVEMENT DESIGN

AN EXAMINATION OF THREE FLEXIBLE AND THREE RIGID HIGHWAY DESIGN TECHNIQUES WAS EXECUTED TO DETERMINE THE RELATIVE EFFECTS OF VARIOUS DESIGN PARAMETERS ON PAVEMENT THICKNESS AND TO SYNTHESIZE SIMPLIFIED DESIGN METHODS FOR THE TWO PAVEMENT TYPES. THE ANALYSIS PHASE OF THIS INVESTIGATION CONSISTS OF ORGANIZING THE DESIGN-PROCESS LOGIC INTO A HIERARCHY STRUCTURE AND FORMULATING EACH TECHNIQUE INTO A COMPREHENSIVE MATHEMATICAL OR GRAPHICAL THICKNESS MODEL. AN EVALUATION OF THE INFLUENCES ON THICKNESS OF THE MAJOR DESIGN FACTORS BY A SENSITIVITY ANALYSIS WITH A THEORETICAL AND TWO PRACTICAL MEASURES OF PARAMETER IMPORTANCE, A STUDY OF THE PARAMETER VARIATIONS TOLERATED BY SELECTED THICKNESS CHANGE CONSTRAINTS AND A LEAST SQUARES FITTING OF APPROPRIATE EQUATIONS TO PARAMETER-THICKNESS DATA PRECEDED THE DEVELOPMENT OF SIMPLIFIED FLEXIBLE AND RIGID PAVEMENT DESIGN METHODS. THE HIERACHY STRUCTURE OF DESIGN-PROCESS LOGIC AND THE THEORETICAL MEASURE OF PARAMETER IMPORTANCE REVEAL CONSIDERABLE DIFFERENCES AMONG TECHNIQUES AS TO THE PROCESS OF RESOLVING DESIGN THICKNESS AND TO THE RELATIVE THEORETICAL INFLUENCE OF VARIOUS PARAMETERS THAT ESTIMATE THE SAME MAJOR DESIGN FACTORS. HOWEVER, THE PRACTICAL PARAMETER IMPORTANCE MEASURES, WHICH ACCOUNT FOR VARIATIONS IN PARAMETER VALUES AS WELL AS THE FORMULATED PARAMETER-THICKNESS RELATIONSHIP, DEMONSTRATE A GREATER SIMILARITY IN THE IMPORTANCE OF GENERIC FACTORS AMONG DESIGN METHODS. FOR FLEXIBLE PAVEMENT DESIGN, TRAFFIC LOAD AND SUBGRADE SUPPORT ARE THE MORE INFLUENCIAL FACTORS IN THE DETERMINATION OF PAVEMENT THICKNESS. TRAFFIC LOAD AND PAVEMENT STRUCTURAL PROPERTIES EXERT THE GREATER INFLUENCE ON RIGID PAVEMENT THICKNESS REQUIREMENTS. DESIGN PRECISION IS PRESENTLY NOT COMMENSURATE WITH DESIGN OR CONSTRUCTION THICKNESS TOLERANCES. OF THE VARIOUS MODEL APPROXIMATIONS OF THE PARAMETER-THICKNESS RELATIONSHIPS, THE LINEAR MODEL IS PREFERABLE BECAUSE IT BEST EXPRESSES THE THICKNESS DESIGN RELATIONSHIPS AND IS STATISTICALLY EFFICIENT. THE SIMPLIFIED DESIGN METHODS, WHICH WERE DEVELOPED FROM A SYNTHESIS OF DATA GENERATED FOR THE THREE FLEXIBLE AND FOR THE THREE RIGID TECHNIQUES, RELATE THICKNESS TO THE TWO MORE IMPORTANT INDEPENDENT DESIGN VARIABLES FOR EACH TYPE OF PAVEMENT. /AUTHOR/

  • Supplemental Notes:
    • No 13, 251 PP, 94 FIG, 25 TAB, 7 APP
  • Corporate Authors:

    Purdue University/Indiana Department of Transportation JHRP

    Purdue University, School of Civil Engineering
    West Lafayette, IN  USA  47907-1284
  • Authors:
    • Buick, T R
  • Publication Date: 1968-7

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Filing Info

  • Accession Number: 00205740
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jan 31 1994 12:00AM