STRESS DISTRIBUTION IN RECTANGULAR CONCRETE SLABS UNDER WHEEL LOADS

COMPARISONS OF ELASTICITY THEORY AND EXPERIMENT BASED ON MAXIMUM STRESS GENERALLY CANNOT GIVE A DEFINITE INDICATION OF THE THEORY'S APPLICABILITY BECAUSE THE THEORETICAL STRESS DEPENDS STRONGLY ON THE YOUNG'S MODULUS AND POISSON'S RATIO OF THE CONCRETE AS WELL AS THE MODULUS OF SUBGRADE REACTION, THE EXACT VALUES OF WHICH ARE DIFFICULT TO ASCERTAIN. ALTHOUGH STRESS DISTRIBUTIONS WERE MEASURED IN THE AASHO ROAD TEST, AND CONTOURS OF MAJOR AND MINOR PRINCIPAL STRESSES PRESENTED, BECAUSE OF THE MATHEMATICAL DIFFICULTY INVOLVED NO EFFORT HAS BEEN MADE TO COMPARE THESE CONTOURS WITH THOSE OBTAINED BY THE THEORY OF ELASTICITY. AN APPROXIMATE METHOD IS PRESENTED HERE FOR DETERMINING STRESS DISTRIBUTION IN RECTANGULAR CONCRETE SLABS, BASED ON THE THEORY OF THIN PLATES ON ELASTIC FOUNDATIONS. IT WAS FIRST DEVELOPED BY VINT AND ELGOOD IN 1935 AND MODIFIED BY MURPHY IN 1937 FOR THE CASE IN WHICH PART OF THE PLATE IS NOT IN CONTACT WITH THE SUBGRADE. BECAUSE OF ITS REQUIREMENT FOR SOLUTION OF SEVERAL SIMULTANEOUS EQUATIONS, THE METHOD HAS RECEIVED LITTLE ATTENTION. HOWEVER, WITH THE ADVENT OF HIGH-SPEED COMPUTERS IT LENDS ITSELF TO ACCURATE COMPARISONS WITH EXPERIMENTAL RESULTS. MODIFICATIONS OF THE METHOD TO INCLUDE CERTAIN REALISTIC ASPECTS OF CONCRETE PAVEMENT TESTING ARE DESCRIBED, AND A COMPARISON OF EXPERIMENTAL AND THEORETICAL CONTOURS IS PRESENTED.

Media Info

  • Media Type: Print
  • Features: Figures; References;
  • Pagination: pp 70-72
  • Monograph Title: Theory of pavement design
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00205867
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Jun 11 1971 12:00AM