SENSITIVITY ANALYSIS OF THE EXTENDED AASHO RIGID PAVEMENT DESIGN EQUATION

A SENSITIVITY ANALYSIS OF STOCHASTIC RIGID PAVEMENT DESIGN VARIABLES IS DESCRIBED. THE MATHEMATICAL MODEL USED IS THAT OF THE EXTENDED AASHO INTERIM GUIDE FOR THE DESIGN OF RIGID PAVEMENT STRUCTURES. THE SENSITIVITY ANALYSIS DETERMINED THE RELATIVE IMPORTANCE OF THE RIGID PAVEMENT DESIGN VARIABLES AND ALSO EVALUATED THE EFFECTS OF STOCHASTIC VARIATIONS FOR EACH VARIABLE. AN ANALYSIS OF VARIANCE WAS MADE TO DETERMINE WHAT INTERACTIONS AMONG RIGID PAVEMENT DESIGN VARIABLES WERE SIGNIFICANT. THE SENSITIVITY ANALYSIS IS FOR A FULL FACTORIAL OF THE VARIABLES. THE VARIABLES INCLUDED ARE THE MODULUS OF ELASTICITY, FLEXURAL STRENGTH, SLAB THICKNESS, SLAB CONTINUITY, MODULUS OF SUBGRADE REACTION, INITIAL SERVICEABILITY INDEX, AND TERMINAL SERVICEABILITY INDEX. EACH VARIABLE WAS EVALUATED FOR 2 LEVELS EXCEPT THAT THE MODULUS OF SUBGRADE REACTION WAS EVALUATED AT 3 LEVELS AND THE INITIAL AND TERMINAL SERVICEABILITY INDEXES WERE EVALUATED FOR THE EFFECT OF PERTURBATIONS AROUND ITS MEAN. IN ORDER TO COMPARE MEANINGFUL VARIATIONS, THE STANDARD DEVIATION WAS USED RATHER THAN THE STANDARD UNIT CHANGE IN THE VARIABLE. THE ANALYSIS SHOWED THAT FLEXURAL STRENGTH AND THICKNESS WERE THE MOST IMPORTANT DESIGN VARIABLES. OTHERS OF IMPORTANCE WERE THE SLAB CONTINUITY AND TERMINAL AND INITIAL SERVICEABILITY INDEXES. THE MODULUS OF SUBGRADE REACTION AND MODULUS OF ELASTICITY WERE THE LEAST IMPORTANT OF THE DESIGN VARIABLES CONSIDERED. THE ANALYSIS OF VARIANCE INDICATED THE SAME ORDERING OF VARIABLES AND SHOWED SIGNIFICANT INTERACTIONS AMONG THE VARIABLES. /AUTHOR/

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 20-33
  • Monograph Title: Design and performance of rigid and flexible pavements
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00205855
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Apr 25 1971 12:00AM