ANALYSIS OF BENDING STIFFNESS VARIATION AT CRACKS IN CONTINUOUS PAVEMENTS

DISCONTINUITIES EXERT SIGNIFICANT INFLUENCE ON THE BENDING RIGIDITY OF STRUCTURAL MEMBERS. THE EFFECT OF TRANSVERSE CRACKS ON THE BEHAVIOR OF CONTINUOUSLY REINFORCED CONCRETE PAVEMENTS IS STUDIED, AND THE RESULTS SHOW THAT THE PERCENT REDUCTION IN BENDING STIFFNESS AT CRACK LOCATIONS RANGES BETWEEN 80 AND 90 PERCENT OF THE ORIGINAL UNCRACKED VALUE. BY SIMULATING THIS EFFECT ON THE DISCRETE-ELEMENT MODEL, A SENSITIVITY STUDY WAS PERFORMED ON THE PARAMETERS CONSIDERED IN THE DESIGN OF CONTINUOUSLY REINFORCED CONCRETE PAVEMENTS. THESE COVERED THE PRACTICAL RANGE OF EACH OF THE FOLLOWING VARIABLES: SLAB BENDING STIFFNESS, MODULUS OF SUBGRADE REACTION, AND CRACK SPACING. FROM THE ANALYSIS OF VARIANCE, THE MOST SIGNIFICANT VARIABLES, WHICH EXPLAINED AROUND 90 PERCENT OF THE VARIATION IN DEFLECTION AND PRINCIPAL MOMENT (STRESS) RESPONSES, WERE SLAB BENDING STIFFNESS AND MODULUS OF SUBGRADE REACTION. CRACK SPACING SHOWED A MINOR EFFECT ON SLAB BEHAVIOR. THE ORTHOGONAL POLYNOMIAL BREAKDOWN INDICATED THAT IN A LOGARITHMIC MODEL, THE LINEAR EFFECT OF BOTH SUBGRADE MODULUS AND SLAB BENDING STIFFNESS IS HIGHLY SIGNIFICANT. FURTHERMORE, INTERACTIONS BETWEEN THESE TWO DESIGN VARIABLES DO OCCUR, INDICATING THAT VARIATIONS IN DEFLECTIONS AND PRINCIPAL MOMENTS ARE NOT DEFINED BY THE MAIN EFFECT OF DESIGN VARIABLES ALONE. THE INFLUENCE OF THE WIDTH OF THE CRACK ON THE BEHAVIOR AND PERFORMANCE OF CONTINUOUSLY REINFORCED CONCRETE PAVEMENTS IS HIGHLY SIGNIFICANT. SLAB DEFLECTIONS INCREASE DRASTICALLY AS CRACK WIDTH INCREASES, WHILE NO SIGNIFICANT CHANGE IN PRINCIPAL MOMENTS IS ENCOUNTERED. /AUTHOR/

  • Supplemental Notes:
    • RES REPT 56-22
  • Corporate Authors:

    University of Texas, Austin

    Center for Highway Research, 200 West 21st Street
    Austin, TX  United States  78712
  • Authors:
    • Abou-Ayyash, A
    • Hudson, W R
  • Publication Date: 1972-4

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 125 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00206033
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Nov 28 1972 12:00AM