NEW FORMULAS FOR STRESS IN CONCRETE PAVEMENTS OF AIRFIELDS

THE STRESSES INVESTIGATED HERE ARE CAUSED BY LOADS. THE LOAD IS A PRESSURE TRANSMITTED THROUGH THE OBLONG FOOTPRINT OF A TIRE OF A LANDING GEAR. THREE POSITIONS OF THIS LOAD ARE CONSIDERED: THE FIRST IS AT A CONSIDERABLE DISTANCE FROM ANY EDGE OR JOINT, IN THE INTERIOR OF THE AREA OF A PANEL OF THE PAVEMENT, THE SECOND POSITION IS NEXT TO AN EDGE OR NEXT TO A JOINT THAT HAS NO CAPACITY FOR LOAD TRANSFER, BUT IS AT AN APPRECIABLE DISTANCE FROM ANY CORNER OF THE PANEL, AND THE THIRD POSITION IS NEXT TO A JOINT THAT PERMITS SOME TRANSFER OF LOAD TO THE ADJACENT PANEL, BUT IS AT AN APPRECIABLE DISTANCE FROM ANY CORNER OF THE PANEL. FORMULAS ARE GIVEN FOR STRESSES AND DEFLECTIONS CAUSED BY SUCH LOADS. THE SIGNIFICANT STRESSES ARE TENSILE STRESSES AT THE BOTTOM OF THE SLAB. THE BOUNDARY OF THE FOOTPRINT OF THE TIRE IS USUALLY A CURVE THAT LIES BETWEEN AN ELLIPSE AND A CIRCUMSCRIBED RECTANGLE, BUT FOR PRESENT PURPOSES THIS CURVE CAN BE REPLACED IN MOST CASES BY AN EQUIVALENT SLIGHTLY MORE OBLONG ELLIPSE, AND THE LOAD CAN BE CONSIDERED TO BE DISTRIBUTED UNIFORMLY OVER THE AREA OF THIS ELLIPSE. SPECIFIC FORMULAS ARE DERIVED UNDER THE ASSUMPTION OF SUCH A LOAD, BUT GENERAL FORMULAS ARE ALSO STATED WHICH APPLY FOR ANY SHAPE OF THE FOOTPRINT (INCLUDING THE CASE OF DUAL TIRES). THE BASIC FORMULAS FOR STRESSES UNDER LOADS IN THE INTERIOR OF THE AREA OF A PANEL HAVE BEEN PUBLISHED PREVIOUSLY, BUT THE REMAINING FORMULAS ARE THE RESULT OF NEW DERIVATIONS. /AUTHOR/

  • Supplemental Notes:
    • Vol 113, PaPER NO 2340, PP 425-444, 3 FIG, 1 TAB
  • Authors:
    • WESTERGAARD, H M
  • Publication Date: 1948

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  • Accession Number: 00206780
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 10 1994 12:00AM